Abstract

Provided is a surrogate modeling method for shale oil fractured system simulation based on trajectory piecewise-linearization, which relates to the technical field of unconventional oil and gas development and includes: establishing a numerical simulation model of a shale oil reservoir fractured system, and solving the numerical simulation model to obtain solution data of a matrix and a fracture of an original model; constructing base functions of matrix and fracture solutions by a sampling matrix; finding a saved solution closest to field data of a current time step in a training trajectory; obtaining a linear equation set for ascertaining field data of next time step, and performing projection and order reducing solving; and verifying whether field data of a new time step is reasonable until a set production time is reached. A resulting surrogate model can rapidly simulate slightly compressible flow in a fractured porous medium.

IPC Classes  ?

• G01V 20/00 - Geomodelling in general
• E21B 47/08 - Measuring diameters or related dimensions at the borehole
• G06F 17/11 - Complex mathematical operations for solving equations

Abstract

A pore pressure prediction method for fine-grained hybrid sedimentary rock based on variable P-wave velocity includes: carrying out a P-wave velocity test of rock under different effective stresses, determining a function form of the relationship between acoustic velocity and effective stress, fitting the parameters in the function by optimization, and establishing an evaluation model of effective stress influence term by lithology. According to the measured formation pressure data and the effective stress influence term model, the acoustic velocity background value is deduced, the logging curve is preferred, and the acoustic velocity background value logging evaluation model is established. According to the logging curves of DT and DEN, combined with the lithology identification results, the acoustic velocity background value is calculated, and then the effective stress of the formation is obtained, and then the pore pressure is determined according to the overburden pressure.

IPC Classes  ?

• G01V 11/00 - Prospecting or detecting by methods combining techniques covered by two or more of main groups

Abstract

The present invention belongs to the technical field of functional nanomaterials and petrochemicals, and proposes a temperature and salinity tolerant magnetic nanofluid, preparation method and use thereof, wherein the nanofluid comprises: magnetic core-shell structured nanoparticles Fe3O4@TiO2, with a content of 0.01-0.2 wt %, and water. The magnetic nanofluid is temperature and salinity resistant, and the magnetic core-shell structured nanoparticles Fe3O4@TiO2 are characterized in having small particle sizes and uniform dispersion, and are recyclable and reusable, and the recycling rate by using magnet after imbibition displacement experiments is as high as 96%, and the present invention provides an efficient solution for the huge problem in high efficiency development of ultra-low permeability reservoirs.

IPC Classes  ?

• H01F 1/44 - Magnets or magnetic bodies characterised by the magnetic materials thereforSelection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids

Abstract

A supergravity device and an energy-optimized supergravity decarbonization system. The supergravity device comprises: a housing (8), wherein a cavity is provided in the housing (8), and a rotating shaft, packing (2), a lower packing clamping plate (10) and an upper packing clamping plate (11) are provided in the cavity; and a liquid inlet, a liquid outlet (6), a gas inlet (9) and a gas outlet (12) are also provided on the housing (8). The packing (2) is arranged between the upper packing clamping plate (11) and the lower packing clamping plate (10), the upper packing clamping plate (11) is trapezoidal, and an annular protrusion (13) is provided on the lower packing clamping plate (10); one end of the rotating shaft is arranged in the cavity, and the other end of the rotating shaft extends out of the housing (8) and is connected to a driving mechanism; and the packing (2) is symmetrically arranged on two sides of the rotating shaft, and spraying pipes (1) are provided on two sides of the rotating shaft, and are connected to the liquid inlet. The supergravity device can improve the uniformity of the gas-liquid distribution at an upper half part of the packing, thus reducing an ineffective gas-liquid contact area, increasing a liquid utilization rate, and enabling gas and liquid to come into full contact.

IPC Classes  ?

• B01D 53/78 - Liquid phase processes with gas-liquid contact
• B01D 53/62 - Carbon oxides
• B01D 53/96 - Regeneration, reactivation or recycling of reactants
• B01D 53/34 - Chemical or biological purification of waste gases

Abstract

The present invention belongs to the technical field of ultra-short baselines. Disclosed is a mounting support for an ultra-short baseline. The problem of an existing mounting support for an ultra-short baseline requiring an electric motor to maintain an operation state for a long period of time is solved. The mounting support comprises a main housing, a mounting assembly and a lower support block, wherein the lower support block for supporting an ultra-short baseline is fixedly mounted on a side face of the main housing, and the mounting assembly is arranged on the other side of the main housing; and a clamping mechanism for clamping the ultra-short baseline is provided on the side face of the main housing. In the present invention, by means of the provision of the clamping mechanism and the lower support block, the position of an upper clamping plate can be manually adjusted to shorten the distance between the upper clamping plate and the lower support block, such that the upper clamping plate and the lower support block clamp and fix the ultra-short baseline located at the middle end to quickly complete the locking of the position of the ultra-short baseline; moreover, during use, an electric motor is not required to maintain an operation state, such that the service life of each component in an apparatus is prolonged, thereby improving the stability of the apparatus during operation.

IPC Classes  ?

• F16M 13/02 - Other supports for positioning apparatus or articlesMeans for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle

Abstract

The present invention provides a high-gravity device and an energy-optimized high-gravity decarbonization system, the high-gravity device comprises a housing, having a cavity therein; a solution inlet, a solution outlet, a gas inlet, and a gas outlet are provided on the housing; a rotating shaft, a packing, a packing lower clamping plate, and a packing upper clamping plate are provided in the cavity; wherein, the packing arranged between the two clamping plates is trapezoidal in section and is symmetrically placed on both sides of the rotating shaft; the packing upper clamping plate has a certain inclination angle, and an annular bulge is provided on the packing lower clamping plate; one end of the rotating shaft is arranged in the cavity, and another end extends out of the housing and is further connected to a driving mechanism; and, spray pipes are provided on both sides of the rotating shaft and are connected to the solution inlet.

IPC Classes  ?

• B04B 5/04 - Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers
• B04B 15/02 - Other accessories for centrifuges for cooling, heating, or heat insulating

Abstract

Provided is a simulation method and system of joint exploitation of natural gas hydrate, shallow gas and deep-seated gas. The method includes: constructing a simulation model of joint exploitation of a shallow gas layer and a hydrate layer, including setting and meshing the shallow gas layer and the hydrate layer, constructing the simulation model of joint exploitation by setting a formation parameter and a production parameter, and solving the model to acquire productivity data; constructing a simulation model of joint exploitation of the shallow gas layer, the deep-seated gas layer and the hydrate layer, including setting and meshing the shallow gas layer, the deep-seated gas layer and the hydrate layer, constructing a simulation model of joint exploitation of the shallow gas layer, the deep-seated gas layer and the hydrate layer by setting the formation parameter and the production parameter, and solving the model to acquire productivity data.

IPC Classes  ?

• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
• E21B 41/00 - Equipment or details not covered by groups

Abstract

A quantitative simulation method for contributions of three origin of overpressure in sandstone is provided. Analytical testing data, well logging data, geological data, seismic data, and the like are collected and collated. A formation pressure characteristic of sandstone of a target horizon is analyzed and a burial history and a thermal history of the sandstone of the target horizon is reconstructed. An undercompacted pore pressure evolution history and an undercompacted hydrocarbon generation pressurized pore pressure evolution history, and a total pore pressure evolution history is quantitatively simulated. A quantitative analysis is performed on contributions of three origin of overpressure: quantitatively analyzing contributions of undercompaction, pressurization by hydrocarbon generation, and other origin to overpressure according to Ptotal=Punderc+Phydrog and Ptotal=Punderc+Phydrog+Ptotal to obtain overpressure evolution mechanisms of three origins. The contributions of the origins of overpressure in the sandstone are quantitatively simulated, and a geological exploration region of an oil and gas reservoir is determined.

IPC Classes  ?

• G01V 20/00 - Geomodelling in general
• E21B 49/00 - Testing the nature of borehole wallsFormation testingMethods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

Abstract

Provided in the present invention is a power prediction method for distributed photovoltaic power stations, the method comprising: acquiring a satellite cloud image of distributed photovoltaic power stations at a historical moment and a satellite cloud image of the distributed photovoltaic power stations at a current moment to predict satellite cloud image features at a future moment; selecting several photovoltaic power stations to install solar irradiance collection apparatuses, and on the basis of the satellite cloud images, collected solar irradiance, and location information of the photovoltaic power stations, calculating the solar irradiance of all the photovoltaic power stations; on the basis of the satellite cloud image features at the future moment and the collected solar irradiance of the photovoltaic power stations, obtaining the solar irradiance of the distributed photovoltaic power stations at the future moment; and on the basis of the solar irradiance of the distributed photovoltaic power stations at the future moment and weather forecast information at the future moment, predicting the power of the distributed photovoltaic power stations at the future moment. In the solution of the present invention, solar irradiance data is expanded, and a mapping relationship between satellite cloud images and solar irradiance and a mapping relationship between solar irradiance and power are constructed by means of prediction, so that the power of distributed photovoltaic power stations is predicted, thereby improving the prediction precision.

IPC Classes  ?

• G06F 30/27 - Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model

Abstract

A well-killing system for ultra-deep well drilling with co-existence of overflow and lost circulation is provided. An upper part of a wellhead blowout preventer is connected to a first mud pump and a lost circulation material mud tank through a pipeline, a first three-way control valve, and a second three-way control valve. A lower port of the second three-way control valve is connected to a second mud pump and a mud pit. A lower port of the first three-way control valve is connected to a first well-killing fluid tank and a second well-killing fluid tank. A gas-liquid separation tank is connected to a side of a wellhead device. A first pressure sensor and a first flowmeter are provided on a left port of the first three-way control valve. A second pressure sensor and a second flowmeter are provided at a left port of a third three-way control valve.

IPC Classes  ?

• E21B 21/08 - Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
• E21B 21/10 - Valves arrangements in drilling-fluid circulation systems

Abstract

The present disclosure relates to the technical field of drilling fluid, and discloses a high density environmentally friendly polymer water-based drilling fluid with resistance to 240° C. and saturated salts, a preparation method therefor and use thereof. The water-based drilling fluid comprises a micro-crosslinked heterocyclic polymer filtrate reducer, a hyper-branched strongly adsorbed filtrate reducer, a nanometer intercalated complex shearing potentiator, a flexible outer and rigid inner microsphere plugging agent, and water, wherein the micro-crosslinked heterocyclic polymer filtrate reducer is prepared by reacting sodium p-styrene sulfonate, N,N,N-trimethyl-3-(2-methylallylamino)-1-propyl ammonium chloride, N,N-diethyl acrylamide, N-vinyl caprolactam, tetramethyl ethylenediamine with phenyl triethoxy silane. The high density environmentally friendly polymer water-based drilling fluid with resistance to 240° C. and saturated salts of the present disclosure can exhibit good performance at high temperature and high salinity conditions, and has desirable weighting capability, it can meet the requirements of drilling well in the deep oil and gas formations.

IPC Classes  ?

• C09K 8/24 - Polymers
• C09K 8/508 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds
• C09K 8/512 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
• E21B 21/06 - Arrangements for treating drilling fluids outside the borehole

Abstract

Disclosed is a method for determining the dynamic adsorption retention of polymer capsules, belonging to the technical field of oil and gas field development engineering, which includes: (1) carrying out a thermal aging experiment to establish relational expressions between a capsule concentration and an aging time, as well as a polymer release concentration and the aging time; (2) setting up a polymer capsule displacement experimental device to determine the release concentration of polymers in effluent; (3) releasing polymers encapsulated by capsules in the effluent to acquire a total adsorption retention of polymers in a porous medium; and (4) inverting respective adsorption retentions of the capsule particles and the polymers in the porous medium.

IPC Classes  ?

• G01N 21/33 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light

Abstract

A high-temperature and high-salt resistant hyperbranched lubricant for a water-based drilling fluid, and preparation and application thereof are provided, belonging to the technical field of oilfield chemistry. The preparation method includes the steps of: mixing tetraethyl orthosilicate (TEOS), diethanolamine (DEA), and triethanolamine (TEA) for a transesterification and polycondensation reaction to obtain highly reactive hyperbranched polysiloxane; adding an acrylamide (AM) monomer, an anionic monomer, and a polar ester monomer into deionized water to obtain a monomer solution; adjusting the pH of the monomer solution to 5-9, and then adding highly reactive hyperbranched polysiloxane; introducing nitrogen to remove oxygen, adding an initiator, and thermally initiating a polymerization reaction; and after the reaction is completed, vacuum-drying and crushing an obtained product to obtain the high-temperature and high-salt resistant hyperbranched lubricant for a water-based drilling fluid.

IPC Classes  ?

• C09K 8/12 - Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
• C08F 283/12 - Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass on to polysiloxanes
• C10M 107/50 - Lubricating compositions characterised by the base-material being a macromolecular compound containing silicon
• C10M 173/02 - Lubricating compositions containing more than 10% water not containing mineral or fatty oils
• C10N 20/00 - Specified physical properties of component of lubricating compositions

Abstract

The present disclosure discloses a Y-shaped entrained-flow high-temperature zoned gasification device adopting dry-process slag-discharging, which comprises a Y-shaped entrained-flow gasifier, wherein the Y-shaped entrained-flow gasifier is partitioned by a sectioned conical head into an upper gasification chamber and a lower chilling chamber; a descending bed atomizing chiller is arranged in the chilling chamber, a conical top of the descending bed atomizing chiller is in communication with an outlet of the sectioned conical head, and two or more chilling atomizing nozzles are evenly arranged on the conical top of the descending bed atomizing chiller in a circumferential direction.

IPC Classes  ?

• C10J 3/48 - ApparatusPlants
• C10J 3/82 - Gas withdrawal means
• C10J 3/86 - Other features combined with waste-heat boilers

Abstract

The embodiment of the present disclosure provides a method and a device for fine reconstruction of a sedimentation structure of a flume. The device includes: a combined bottom plate and a combined freezing flume, wherein the combined bottom plate is formed by tiling and splicing a plurality of equal-thickness and rectangular basic bottom plates, a splicing gap is located between adjacent basic bottom plates, the splicing gap is filled with elastic adhesive, and the filled splicing gap is as thick as the basic bottom plates; the combined freezing flume includes a plurality of local freezing flumes; and each of the basic bottom plates has a local freezing flume that matches the basic bottom plate.

IPC Classes  ?

• G01V 5/12 - Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using gamma- or X-ray sources

Abstract

A process for preparing fuel gas through gasification of powdered coal, comprising: contacting powdered coal and ash residue in a riser reactor under hydrogenation conditions to perform a pyrolysis reaction and a gas-phase tar cracking reaction; subjecting it to a primary gas-solid separation to obtain a gasified gas and a solid fraction; subjecting the gasified gas to a secondary gas-solid separation to obtain a solid fraction containing fine particle semi-coke and a gasified gas; subjecting the solid fraction to a gasification calcination reaction, flowing the gasified coal gas and the high-temperature ash residue u into the riser reactor; subjecting the solid fraction containing fine particle semi-coke to a melting gasification reaction, falling the liquid residue to the material-returning device of fluidized bed for cooling and solidification, and feeding the second high-temperature gasified coal gas to the riser reactor via a high-temperature gasified gas returning pipe.

IPC Classes  ?

• C10J 3/54 - Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
• C10J 3/56 - ApparatusPlants
• C10J 3/57 - Gasification using molten salts or metals
• C10J 3/72 - Other features
• C10J 3/84 - Gas withdrawal means with means for removing dust or tar from the gas

Abstract

Provided in the present invention are a spherical catalyst for hydrogen peroxide synthesis via an anthraquinone process and a preparation method therefor, belonging to the technical fields of catalytic materials and catalyst preparation. The method comprises: reacting a first aluminum source, which has P123 mixed therein, with a precipitant to obtain an aluminum oxide precursor, redispersing the aluminum oxide precursor in P123 and assembling to obtain a porous aluminum oxide precursor; dispersing the porous aluminum oxide precursor and a second aluminum source in deionized water, and adding a solution of a palladium-containing compound and an additive-containing compound to prepare a catalyst precursor slurry; adding gelatin and gum arabic to the catalyst precursor slurry and uniformly mixing same to prepare a composite colloidal solution, adding the colloidal solution dropwise to a liquid column consisting of an upper-layer oil phase and a lower-layer curing agent, and then carrying out aging, drying, calcining, and reduction to obtain the spherical catalyst. The present invention is doped with the porous aluminum oxide precursor, thereby improving the pore structure of the catalyst, increasing the utilization rate of the interior of spherical aluminum oxide, and reducing the mass transfer resistance of the reaction.

IPC Classes  ?

• B01J 21/04 - Alumina
• B01J 23/44 - Palladium
• B01J 23/58 - Platinum group metals with alkali- or alkaline earth metals or beryllium
• B01J 37/03 - PrecipitationCo-precipitation
• C01B 15/023 - Preparation from organic compounds by the alkyl-anthraquinone process

Abstract

Provided in the present invention are a continuous-reforming catalyst and a preparation method therefor, belonging to the technical field of catalyst preparation. The method comprises: performing hydrothermal crystallization on a first aluminum source and a modifier to obtain aluminum oxide precursor nanofibers; mixing the aluminum oxide precursor nanofibers with a second aluminum source, and adding the mixture to a solution of a platinum-containing compound, a tin-containing compound, and a lanthanide-containing compound to prepare a catalyst precursor slurry; adding gelatin and gum arabic to the catalyst precursor slurry, uniformly mixing same to prepare a composite colloidal solution, adding the composite colloidal solution dropwise to a liquid column consisting of an upper-layer oil phase and a lower-layer curing agent solution to shape the composite colloidal solution, then after aging, drying, and calcining, obtaining an oxidized spherical catalyst; and reducing the obtained oxidized spherical catalyst to obtain an activated spherical catalyst. Because active metals can be better dispersed on the surface of the spherical catalyst, the dispersion of Pt is improved, thus improving the carbon deposition resistance and stability of the catalyst.

IPC Classes  ?

• B01J 27/135 - HalogensCompounds thereof with titanium, zirconium, hafnium, germanium, tin or lead
• B01J 35/00 - Catalysts, in general, characterised by their form or physical properties
• B01J 37/00 - Processes, in general, for preparing catalystsProcesses, in general, for activation of catalysts
• B01J 37/18 - Reducing with gases containing free hydrogen
• B01J 37/03 - PrecipitationCo-precipitation
• C10G 69/00 - Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process

Abstract

An electromagnetic reversal downhole pressure intensifier is provided, including a pressure intensifier and a drill bit. A nozzle and a bit water way are arranged on the drill bit, the pressure intensifier includes an electromagnetic valve seat, a pressurizing chamber, and a discharge flow pup joint; an electromagnetic valve is arranged in the electromagnetic valve seat, and an electromagnetic valve seat flow channel is arranged on the electromagnetic valve seat; a plunger is arranged in the pressurizing chamber, and the upper end of the plunger separates the inner chamber of the pressurizing chamber into a non-rod chamber and a rod chamber; a conveying pipe is arranged in the discharge flow pup joint, and a flow channel is formed between the conveying pipe and the discharge flow pup joint; the drill bit is connected to the discharge flow pup joint.

IPC Classes  ?

• E21B 7/18 - Drilling by liquid or gas jets, with or without entrained pellets
• E21B 21/10 - Valves arrangements in drilling-fluid circulation systems
• E21B 23/10 - Tools specially adapted therefor

Abstract

A resin slurry for a fractured-vuggy formation and the preparation and use thereof, which belong to the field of drilling fluid lost circulation control. The resin slurry plugging system is composed of the following raw materials in mass percentage: 20%-40% of composite resin plugging agent, 0.5%-5.0% of consolidating agent, 0.5%-5.0% of flow pattern regulator, 0.3%-1.2% of cross-linking agent, 0.3%-1.2% of retarder, 3%-12% of filling agent, and the balance of water. The plugging system has a certain fluidity under low-temperature conditions, is easy to be injected into the formation, and can fill a lose channel of a fractured-vuggy reservoir. The consolidating time of the plugging system is controllable, and the construction conditions are safe. The plugging system forms a three-dimensional cross-linked network structure consolidation after cross-linking and consolidating under high-temperature conditions of the formation.

IPC Classes  ?

• C09K 8/42 - Compositions for cementing, e.g. for cementing casings into boreholesCompositions for plugging, e.g. for killing wells
• C09K 8/44 - Compositions for cementing, e.g. for cementing casings into boreholesCompositions for plugging, e.g. for killing wells containing organic binders only
• C09K 8/56 - Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
• E21B 21/00 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
• E21B 33/138 - Plastering the borehole wallInjecting into the formation

Abstract

The present application pertains to the cementing engineering technical field and reveals a cement system for ultra-high temperature resistance with excellent pumpability performance, as well as its preparation method. This cement system comprises a solid component and a liquid component. The solid component is comprised of a weight percentage of 14-70% cement, 3-80% silica sand, 3-80% fly ash, and 3-80% slag powder. The liquid component includes water and additives. This high-temperature resistant cement system exhibits stable performance with a thickening time generally exceeding 6 hours. The initial consistency ranges from 23.8 Bc to 33.6 Bc, exhibiting good pumpability performance. Furthermore, the system maintains stable strength and water permeability during the curing periods from 2 days to 90 days. The high-temperature resistant cementing system provided by this application can overcome the problems of long-term strength retrogression and address issues associated with high initial consistency, pumping difficulty, and short thickening time.

IPC Classes  ?

• C04B 7/24 - Cements from oil shales, residues or waste other than slag

Abstract

2 and sulfides are sequestered in aquifer, achieving effective underground separation of the flue gas components.

IPC Classes  ?

• E21B 41/00 - Equipment or details not covered by groups
• B01D 53/50 - Sulfur oxides
• B01D 53/52 - Hydrogen sulfide
• B01D 53/62 - Carbon oxides
• B01D 53/78 - Liquid phase processes with gas-liquid contact

Abstract

The present discloses a mussel biomimetic heat-resistant and salt-tolerant thickener and a preparation method therefor, a gel fracturing fluid and a preparation method and use thereof.

IPC Classes  ?

• C09K 8/60 - Compositions for stimulating production by acting on the underground formation
• C09K 8/68 - Compositions based on water or polar solvents containing organic compounds
• C09K 8/90 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose

Abstract

Provided are an alternating current field based defect identification method and an array detection probe. The evaluation method includes the following steps: obtaining a magnetic field Bx signal in direction X and a magnetic field Bz signal in direction Z; removing a background magnetic field of each of the magnetic field Bx signal in the direction X and the magnetic field Bz signal in the direction Z, and obtaining a magnetic field Bx1 signal in the direction X and a magnetic field Bz1 signal in the direction Z without background magnetic fields; drawing an array image of the Bx1 signal and an array image of the Bz1 signal; and locating a distortion zone corresponding to disturbance at the same time and position in the array image of the Bx1 signal and the array image of the Bz1 signal.

IPC Classes  ?

• G01N 27/90 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
• G01N 27/904 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors

Abstract

The present disclosure provides a coupling network model lithium-ion battery energy storage system fire spread modeling method, which belongs to the technical field of lithium-ion battery model construction and simulation method. The coupling network model lithium-ion battery energy storage system fire spread modeling method includes: obtaining battery electrochemical parameters, material thermophysical parameters and energy storage system geometric characteristic parameters of a battery energy storage system; establishing a three-dimensional geometric model of air domain inside the energy storage system and performing a grid division; calculating the heat generated inside batteries during thermal runaway; solving the heat transfer and the thermal runaway propagation process between batteries, and calculating the battery temperatures; calculating the gas generation inside batteries during thermal runaway; solving jet dynamics parameters of batteries; and, solving the conservation equations of fluid regions in the battery energy storage system, to predict the fire spread behavior inside an energy storage power station.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G01R 31/367 - Software therefor, e.g. for battery testing using modelling or look-up tables

Abstract

The present invention discloses a method for improving the anti-friction and anti-wear properties of substrate, and relates to the technical field of friction and wear. The method of present invention is to firstly clad alloy powder on the surface of substrate to form the cladding layer, and then perform the texturing and sulfurization treatment in sequence on the cladding layer to form a textured and ion-sulfurized cladding layer with anti-friction and anti-wear properties on the surface of substrate, so as to improve anti-friction and anti-wear properties of the substrate, and to increase efficiency as well as service life of the substrate.

IPC Classes  ?

• B23K 26/342 - Build-up welding
• C23C 8/02 - Pretreatment of the material to be coated
• C23C 8/36 - Solid state diffusion of only non-metal elements into metallic material surfacesChemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
• C23C 24/08 - Coating starting from inorganic powder by application of heat or pressure and heat

Abstract

A microscopic and macroscopic evaluation method for a dual-effect hydrate inhibitor is provided. The method is applicable to the performance evaluation of traditional thermodynamic inhibitors and kinetic inhibitors. The present invention comprehensively evaluates the dual-effect hydrate inhibitor microscopically and macroscopically through a microscopic evaluation device and a macroscopic evaluation device, thereby more intuitively and efficiently screening out the dual-effect inhibitor with excellent performance. The present invention explains the action mechanism of the dual-effect inhibitor microscopically, accurately evaluate the effects of the inhibitor in two aspects of particle aggregation and particle adhesion, and provide a theoretical basis for screening the dual-effect inhibitor. Moreover, the present invention can verify the screened inhibitor macroscopically by using a flow evaluation device close to a field working condition to obtain the action effects of the dual-effect inhibitor under different production parameters, so that the comprehensive and multi-angle performance evaluation of the dual-effect inhibitor is achieved.

IPC Classes  ?

• G01N 19/04 - Measuring adhesive force between materials, e.g. of sealing tape, of coating
• E21B 37/06 - Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting the deposition of paraffins or like substances

Abstract

The invention discloses a modeling method for energy storage tank explosion venting to prevent thermal runaway gas explosion in lithium-ion batteries, which relates to the technical field of lithium-ion battery energy storage tank design, including the following steps: 1. Determine lithium-ion battery type to obtain component classification and ratio of mixed gas produced after thermal runaway; 2. Calculate laminar burning velocity of mixed gas and thermophysical parameters using FreeFlam 1D combustion model; 3. Set coupling boundary of venting plate, divide premixed area inside the tank and the air area outside the tank, establish geometric modeling and grid of battery energy storage tank, and establish three-dimensional combustion process equation according to the boundary conditions; 4. Solve three-dimensional combustion process equation to obtain the evolution characteristics of overpressure, temperature, and wind speed in the internal and external flow fields of energy storage tank.

IPC Classes  ?

• G06F 30/27 - Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model

Abstract

A guar gum fracturing fluid gel and a guar gum fracturing fluid system with reduced pH dependence, a preparation method and an application thereof are disclosed. The fracturing fluid gel includes 0.01-0.2% of nanomaterial, 0.1-0.5% of guar gum, 0.1-0.5% of organic boron-titanium crosslinker and a remaining amount of water. The fracturing fluid gel is more stable in network structure, tolerant of different temperatures and has good shear resistance. A preparation method and an application of the fracturing fluid gel are also provided. In the guar gum fracturing fluid system, the dependence on pH level is reduced, thereby alleviating the damage caused by a high pH value to a reservoir.

IPC Classes  ?

• C09K 8/68 - Compositions based on water or polar solvents containing organic compounds

Abstract

A differentiated real-time injection-production optimization adjustment method of an intelligent injection-production linkage device belongs to the field of oil reservoir injection-production technologies. The method includes: initializing networks; building an injection-production environment model; by an agent, reading an initial state of an injection-production environment; writing a file by an injection-production policy network; obtaining state data of the moment t+1; reading a next state and an economic net present value within the time step; assigning the next state to the current state until a to-be-optimized production period is completed; by batch training on the model, updating a parameter of the environment agent model; updating a parameter of the action evaluation network and a parameter of the injection-production policy network; repeating the above steps until an optimal model is obtained; based on the stored optimal model, linking the intelligent injection-production device to obtain state information of the oil reservoir.

IPC Classes  ?

• E21B 43/16 - Enhanced recovery methods for obtaining hydrocarbons
• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
• G06N 3/092 - Reinforcement learning

Abstract

The present disclosure describes a method for predicting flow and heat transfer performance of all flow patterns in a crude oil heat exchanger, including: constructing an all-flow-pattern oil-water two-phase flow prediction model; inputting parameters of a to-be-tested fluid to the all-flow-pattern oil-water two-phase flow prediction model, and determining a dispersed phase of the to-be-tested fluid with an oil-water phase inversion model, according to the dispersed phase of the to-be-tested fluid is a water phase or an oil phase, solving a water drop or an oil drop distribution based fully coupled population balance model (PBM) until convergence to obtain a first result or a second result, determine a flow pattern of the to-be-tested fluid, and flow and heat transfer associated parameters according to the first result or the second result; determining an overall heat transfer coefficient of a heat exchanger.

IPC Classes  ?

• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]

Abstract

A surfacing process for the outer wall of a pipe, comprising: (1) performing rust removal, dehumidification, oil removal and decontamination, and nondestructive testing on a welding area on the outer wall of a pipe, and selecting the model and specification of a welding wire and a protective gas in the welding process according to an actual working environment and a single-layer surfacing thickness; (2) using an outer wall surfacing mode, after the pipe is preheated, controlling the pipe to continuously rotate and move in the axial direction so as to be welded while the position of a welding gun remains unchanged, and regulating and controlling the pipe to rotate and translate at a flat and stable speed in the welding process, the inclination angle between the welding wire and the surface of the pipe is 60°-80°; (3) when multi-layer surfacing needs to be performed, performing post-heat treatment on the surfacing surface after each layer of surfacing other than the last layer of surfacing, and then performing grinding; and (4) after surfacing is completed, performing heat treatment, performing nondestructive testing, and if the product meets the standards, finishing the surfacing process. The surfacing process effectively improves the creep resistance of the pipe.

IPC Classes  ?

• B23K 37/00 - Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
• B23K 101/06 - Tubes

Abstract

Disclosed is a bio-enzyme degradable temporary plugging material and a preparation method and application thereof in the technical field of natural gas hydrate drilling and production; the preparation method of the bio-enzyme degradable temporary plugging material includes the following steps: mixing the ceramsite with an aqueous solution of 3-aminopropyl trimethoxysilane before a stirring reaction and drying to obtain modified ceramsite; and fully dispersing the modified ceramsite, ethyl cellulose, and epoxy resin in dichloromethane to obtain an oil phase; adding the oil phase into a gelatin aqueous solution and mixing uniformly; after a stirring reaction, evaporating an organic solvent, filtering, washing, and drying, to obtain the bio-enzyme degradable temporary plugging material.

IPC Classes  ?

• C09K 8/42 - Compositions for cementing, e.g. for cementing casings into boreholesCompositions for plugging, e.g. for killing wells

Abstract

A real-time imaging system for a three-dimensional ultrasonic seismic model, which is used for three-dimensional real-time imaging of a seismic model in an indoor water tank experiment, comprising: an ultrasonic sensor network, comprising at least one emitting probe and at least one receiving probe spaced apart from each other to form a network, which is arranged above a seismic model; and a hardware subsystem, comprising a main control unit, an acquisition unit, an emitting unit, an industrial computer and a display, wherein the acquisition unit, the emitting unit and the industrial computer are electrically connected to the main control unit, the emitting probe is electrically connected to the emitting unit, the receiving probe is electrically connected to the acquisition unit, the display is electrically connected to the industrial computer, and a software subsystem is configured in the industrial computer.

IPC Classes  ?

• G01V 1/34 - Displaying seismic recordings
• G01V 1/28 - Processing seismic data, e.g. for interpretation or for event detection

Abstract

Provided is a method for shale gas production prediction, including: acquiring real shale gas production data, and determining a target production decline curve model according to the real shale gas production data; setting a time step for production prediction, and obtaining a linear production decline curve by performing production prediction by using the target production decline curve model based on the time step; determining target shale gas production residuals according to the linear production decline curve and the real shale gas production data, inputting the target shale gas production residuals to a long short-term memory, and obtaining a residual prediction result by performing production prediction according to the long short-term memory and the time step; and determining a target production prediction result of shale gas well to be subjected to production prediction based on the linear production decline curve and the residual prediction result.

IPC Classes  ?

• E21B 43/16 - Enhanced recovery methods for obtaining hydrocarbons
• E21B 49/08 - Obtaining fluid samples or testing fluids, in boreholes or wells
• G01V 20/00 - Geomodelling in general
• G06Q 50/02 - AgricultureFishingForestryMining

Abstract

An in-situ hydrogen permeation and corrosion coupling high-pressure kettle, which comprises: a hydrogen permeation kettle used for containing high-pressure hydrogen, with a first single viewing window (11) being disposed passing through a side wall of the hydrogen permeation kettle; a corrosion kettle, provided with a three-electrode system, the three-electrode system extending into the corrosion kettle, and a sidewall of the corrosion kettle having a second single viewing window (15) passing through same, the first single viewing window (11) and the second single viewing window (15) being in sealed connection with one another and each being a hollow structure, and the hydrogen permeation kettle and the corrosion kettle being in communication with one another by means of the first single viewing window (11) and the second single viewing window (15); a sample clamp arranged between the first single viewing window (11) and the second single viewing window (15) and hermetically closed by means of bolts (13, 14), the sample clamp being used for clamping and securing a sample (12) to be tested, in such a way that two sides thereof are respectively exposed in the environments of the hydrogen permeation kettle and corrosion kettle; and the sample (12) to be tested being connected via a wire to a working electrode connection joint (5) in the three-electrode system, forming a working electrode (12).

IPC Classes  ?

• G01N 17/02 - Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement

Abstract

The present invention relates to a preparation method for an acylhydrazone bond-containing amphiphobic polymer and a nano-amphiphobic reversal agent. The method comprises: polymerizing 2-(perfluorohexyl)ethyl methacrylate, acrylamide and diacetone acrylamide monomers to obtain a terpolymer, and then reacting with adipic dihydrazide to obtain an acylhydrazone bond-containing amphiphobic polymer; then the polymer reacting with vinyltrimethoxysilane-functionalized nanoparticles to obtain a nano-amphiphobic reversal agent of the acylhydrazone bond-containing polymer. The nano-amphiphobic reversal agent of the acylhydrazone bond-containing polymer of the present invention can transform a hydrophilic and oleophilic rock core surface into an oleophobic and hydrophobic rock core surface, and has the advantages of salt resistance, shear resistance and the like, thereby increasing the extraction rate of crude oil.

IPC Classes  ?

• C08F 220/56 - AcrylamideMethacrylamide
• C08F 220/58 - Amides containing oxygen in addition to the carbonamido oxygen
• C08F 220/24 - Esters containing halogen containing perhaloalkyl radicals
• C08F 8/30 - Introducing nitrogen atoms or nitrogen-containing groups
• C08G 83/00 - Macromolecular compounds not provided for in groups
• C09K 8/03 - Specific additives for general use in well-drilling compositions
• C09K 8/24 - Polymers

Abstract

A device for simulating gas intrusion and bullheading in a wellbore under different inclinations is provided, which includes a wellbore outer pipe with an inner pipe and an LED light source therein. An outer wall of the wellbore outer pipe is provided with one or more inlets. A bubble generator is arranged outside a lower plug, and extends through the lower plug via an air inlet needle into the inner cavity of the wellbore outer pipe. An input end of the bubble generator is connected to an air compressor. A lower outlet of the wellbore outer pipe is connected to an inlet of a formation unit through a pipeline and a back pressure valve. A simulating method using such device is also provided.

IPC Classes  ?

• E21B 49/00 - Testing the nature of borehole wallsFormation testingMethods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
• E21B 41/00 - Equipment or details not covered by groups
• G06F 30/20 - Design optimisation, verification or simulation

Abstract

A device and a method for early monitoring of gas intrusion based on pressure wave propagation are provided in the present disclosure. The technical solution is as follows. The lower end of the liquid storage tank is connected to the simulated wellbore through a liquid injection pipeline, a centrifugal pump, a pressure-stabilizing water tank, and a mass flowmeter. One end of the gas storage tank is connected to a screw air compressor, while the other end is connected to the simulated wellbore through an injection pipeline and a micro-orifice flowmeter. The gas-liquid mixer is provided at the upper end of the simulated wellbore, with the pressure-disturbing device connected below it. Multiple pressure sensors are provided at the middle of the simulated wellbore and connected to the computer via wires and an oscilloscope.

IPC Classes  ?

• G01F 1/42 - Orifices or nozzles
• G01F 15/00 - Details of, or accessories for, apparatus of groups insofar as such details or appliances are not adapted to particular types of such apparatus
• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]

Abstract

An experimental device and method for co-existence of overflow and lost circulation in a fractured formation during drilling of a deviated well are provided. An inner cavity of an outer pipe is provided with an inner pipe to form a deviated casing. An upper side of the outer pipe is provided with a mixture outlet. A middle-lower side of the outer pipe is provided with a leakage port and two overflow ports. The gap width can be changed by adjusting a bolt and a support block to be compatible with different types of fracture models. A gas injection system includes an air compressor and a gas flowmeter. An upper port of a liquid injection system is connected to a joint arranged at upper ends of the inner pipe and outer pipe through a water pump, a liquid flowmeter and a liquid regulating valve.

IPC Classes  ?

• E21B 47/10 - Locating fluid leaks, intrusions or movements

Abstract

The present discloses a simulation device and simulation method for liquid sulfur-gas-water multiphase flow and use thereof in a high-temperature and high-pressure gas reservoir with high sulfur content.

IPC Classes  ?

• G01V 9/00 - Prospecting or detecting by methods not provided for in groups
• G01N 15/04 - Investigating sedimentation of particle suspensions
• G01N 15/08 - Investigating permeability, pore volume, or surface area of porous materials
• G01N 21/03 - Cuvette constructions

Abstract

A test system and method for studying behavior characteristics of mixed liquid boiling bubbles. The test system comprises a visual cavity (1), a heating device, a constant temperature water bath (28), a gas collection cavity (26), a third pressure sensor (29), a third temperature sensor, and a data processing module (30); the visual cavity (1) is configured to contain a mixed liquid; the heating device is configured to heat the mixed liquid in the visual cavity (1), and make the mixed liquid generate boiling bubbles; the gas collection cavity (26) is configured to collect the boiling bubbles generated by the mixed liquid in the visual cavity (1); the constant temperature water bath (28) is configured to cool the bubbles collected by the gas collection cavity (26); the third pressure sensor (29) is configured to acquire the gas pressure in the gas collection cavity (26); the third temperature sensor is configured to acquire the temperature of the constant temperature water bath (28); the data processing module (30) is configured to determine the component concentration of the mixed liquid boiling bubbles according to the gas pressure in the gas collection cavity (26) and the temperature of the constant temperature water bath (28). The test system and method realize accurate analysis of the component concentration of the mixed liquid boiling bubbles and research on the behavior characteristics of the boiling bubbles.

IPC Classes  ?

• G01N 25/00 - Investigating or analysing materials by the use of thermal means
• G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups

Abstract

A method and system for predicting water flooding recovery of fault block reservoirs considering a whole process optimization includes: determining influencing factors in water flooding recovery of fault block reservoirs; screening master parameters of the water flooding recovery of the fault block reservoirs; determining a single-factor correlation between the water flooding recovery of the fault block reservoirs and the master parameters; designing multi-factor orthogonal experimental schemes; performing a whole-process water flooding optimization for each of the experimental schemes including separate-layer injection and production, well-type conversion, and injection and production adjustment, to obtain the maximum water flooding recovery; and determining a prediction model of the water flooding recovery of the fault block reservoirs using least square method based on results of the whole process optimization of orthogonal experiments, further obtaining a prediction model of the water flooding recovery of the fault block reservoirs.

IPC Classes  ?

• E21B 43/20 - Displacing by water
• G06F 30/20 - Design optimisation, verification or simulation
• G06F 111/10 - Numerical modelling

Abstract

The present application relates to the field of petroleum engineering, and discloses an apparatus and method for testing lost gas content during simulation of wireline coring. The apparatus comprises: a programmable thermostat used for simulating temperature changes during wireline coring; a simulated central tube used for constructing a simulated environment where the central tube is filled with drilling fluid or clean water; a simulated coring barrel used for drilling and retaining a core sample; a gas injection control and recovery device; a liquid injection control and recovery device; and a water discharge and gas collection meter. The present invention has the advantages that the implementation is simple, and a real drilling coring process can be reproduced to a certain extent. The programmable thermostat and a programmable constant pressure valve are used to simulate coordinated changes of the liquid phase pressure and the temperature environment experienced by a core sample being lifted from the well bottom to the wellhead of a bored well, so that an environment condition where a wireline coring barrel is filled with drilling fluid, and loss changes of the gas content of a core sample coordinatedly decreasing along with the liquid phase pressure and temperature in a liquid phase filling environment during the coring and lifting process can be really reproduced.

IPC Classes  ?

• G01N 7/00 - Analysing materials by measuring the pressure or volume of a gas or vapour

Abstract

The present invention relates to the technical field of hydrogen permeation tests, discloses a high-pressure flow circulation hydrogen permeation test device and method, solves the problem of an existing hydrogen permeation high-pressure kettle being not capable of simulating hydrogen permeation in a hydrogen dynamic conveying process, and improves a simulation effect. The specific solution is as follows: the high-pressure flow circulation hydrogen permeation test device comprises a base, and a kettle body and a compressor, which are fixedly arranged on the base, wherein a sample fixture is fixedly provided on a side wall of the kettle body; one end of the sample fixture is provided with a sample in a clamped manner and extends into the kettle body, and the other end of the sample fixture is fixedly provided with a hydrogen permeation test device; the interior of the sample fixture is in communication with the hydrogen permeation test device; an electrolyte in contact with the sample is contained in the hydrogen permeation test device; and an air inlet and an air outlet of the kettle body are both connected to a compressor by means of pipelines.

IPC Classes  ?

• G01N 17/02 - Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement

Abstract

An experimental device for measuring the leakage rate of a connecting member and a sealing member of a hydrogen-blended pipeline, and a method. The experimental device comprises: a sealing module and a measurement unit; the sealing module comprises a hydrogen-blended gas cylinder, a high-pressure pump, and a high-low temperature tank that are connected in sequence; a member to be measured is mounted in the high-low temperature tank; one end of the high-low temperature tank is connected to the measurement unit; and the measurement unit comprises a water displacement method-based measurement unit and a differential-pressure method-based measurement unit. Leakage measurement data is obtained by means of the measurement unit, then leakage rate data is continuously optimized, and the sealing performance of the pipeline connecting member and the sealing member is improved.

IPC Classes  ?

• G01M 3/04 - Investigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
• G01M 3/28 - Investigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables, or tubesInvestigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipe joints or sealsInvestigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for valves

Abstract

Disclosed in the present invention are a method and system for optimizing a hydrogen detector spatial-arrangement solution on the basis of risk assessment. The method comprises: acquiring the occurrence probability of each leakage scenario in a limited space; selecting a typical leakage scenario from among leakage scenarios according to the occurrence probabilities; presetting monitoring points in the limited space, performing typical leakage scenario simulation in the limited space, and determining the maximum value of a gas cloud volume, which is measured at each monitoring point in the typical leakage scenario and exceeds a concentration threshold value; and obtaining a hydrogen detector spatial-arrangement solution according to the occurrence probability of each typical leakage scenario, the maximum value of the gas cloud volume, which is measured at each monitoring point in the typical leakage scenario and exceeds the concentration threshold value, and a hydrogen detector spatial-arrangement optimization model, which takes the minimum leakage risk as the objective. When hydrogen leakage monitoring is performed by means of the hydrogen detector spatial-arrangement solution determined in the present invention, the risk of hydrogen leakage is the smallest, thereby realizing timely and effective monitoring of hydrogen leakage.

IPC Classes  ?

• G06F 30/18 - Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
• G06F 111/04 - Constraint-based CAD

Abstract

The embodiment of the disclosure relates to an elastic wave stress tensor double-dot product seismic imaging method and device. The method comprises: obtaining a decoupled particle vibration velocity vector wavefield by utilizing the existing decoupled wave equation method for the receiver wavefield; then obtaining a decoupled pseudo-stress wavefield by constructing the decoupled pseudo-stress equation by using the obtained decoupled particle vibration velocity vector wavefield; and finally computing a source second-order stress tensor wavefield and the decoupled receiver second-order stress tensor wavefield by using the double-dot product cross-correlation imaging condition algorithm, to obtain the final scalar imaging results. With the embodiment of the present disclosure, the combined P-wave and S-wave stress exploration can be realized, therefore, the obtained imaging results can be used to accurately predict the risk of gas exploration.

IPC Classes  ?

• G01V 1/30 - Analysis

Abstract

A gel particle-containing discontinuous phase seepage experimental apparatus includes a micro-liquid volume injection system, a pressure acquisition and transmission system, a microscopic observation system, and an in-microchannel particle screening and transfer system. According to the established discontinuous phase seepage experimental apparatus, particle sizes of gel particles are accurately screened by using a customized microfluidic chip, and transfer forms, existing states, pressure fluctuations, and the like of gel particles in a single-channel microfluidic chip under the conditions of different sizes, different elastic modulus, and different quantities are monitored in real-time by using a high-precision pressure sensing system and a microscopic observation system.

IPC Classes  ?

• E21B 49/00 - Testing the nature of borehole wallsFormation testingMethods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
• B01L 3/00 - Containers or dishes for laboratory use, e.g. laboratory glasswareDroppers

Abstract

A method and system for predicting heat exchanger performance, an electronic device and a storage medium are provided. The method comprises: acquiring a flow unit of the heat exchanger and constructing a physical model of the flow unit according to structural parameters of the heat exchanger; constructing a coupled model of an interphase transfer mechanism for oil-gas-water three-phase flow using computational fluid dynamics according to the physical model; constructing a fully coupled population balance model for flow and heat transfer of oil-gas-water three-phase flow; solving the fully coupled population balance model to obtain a model calculation result and determining a Nusselt number and a Fanning friction factor; and determining a comprehensive heat transfer factor, wherein the comprehensive heat transfer factor is used to evaluate heat transfer performance of the heat exchanger.

IPC Classes  ?

• G06F 17/11 - Complex mathematical operations for solving equations
• G01N 25/18 - Investigating or analysing materials by the use of thermal means by investigating thermal conductivity

Abstract

2 spectrum at different water injection amounts is then converted into a pore size distribution at different water injection amounts, and a pore network model at different water injection amounts is built with the pore size distribution. Oil-water two-phase flow simulation is performed, and a corresponding oil-water two-phase relative permeability curve of the rock sample at different pore volume (PV) multiples is obtained eventually. The oil-water two-phase relative permeability curve is the formation parameters in the waterflooding oil reservoir.

IPC Classes  ?

• E21B 43/16 - Enhanced recovery methods for obtaining hydrocarbons
• G01N 15/08 - Investigating permeability, pore volume, or surface area of porous materials
• G01N 33/24 - Earth materials
• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
• G06F 113/08 - Fluids

Abstract

The present disclosure relates to a method for determining oil and gas relative permeabilities of a reservoir. The method includes: drilling a cylindrical core from a to-be-tested reservoir; injecting an oil and gas mixture into the cylindrical core through the piston container at a set flow rate by using the relative permeability testing device, and reducing pressures at a control end of the back pressure valve in sequence to obtain experimental values acquired under each pressure at the control end of the back pressure valve; equivalently simulating developing performance of a producing well of the to-be-tested reservoir using a one-dimensional numerical simulation grid model based on current oil and gas phase relative permeability curves, so as to obtain simulation values at different times; constructing an objective function according to the experimental and simulation values; determining whether a value of the objective function reaches a preset target value.

IPC Classes  ?

• G01N 15/08 - Investigating permeability, pore volume, or surface area of porous materials

Abstract

A fine reconstruction method and apparatus for a flume sediment structure. The apparatus comprises several local freezing chambers. Each local freezing chamber comprises: a cuboid-shaped chamber body with an open bottom face and a hollow interior; at least two channels, which are located on the top face of the chamber body and in communication with the hollow interior thereof, wherein any one of the channels allows the inflow of a freezing medium, and the other channel allows the outflow of the freezing medium after being used; and three metal particles, which are located on the top face of the chamber body at positions different from the two channels, and have different diameters. The fine reconstruction method and apparatus can significantly improve the precision and efficiency of the fine reconstruction of a flume deposition structure without having a highly destructive impact on experiment results.

IPC Classes  ?

• G01N 15/04 - Investigating sedimentation of particle suspensions
• G01N 23/046 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]

Abstract

A bidirectional self-regulating chemical flooding method and system for enhancing oil recovery includes: determining the average particle size of dispersed phase droplets under stable seepage flow of an oil-in-water emulsion according to the average reservoir permeability; determining injection concentration of an emulsifier which matches a target reservoir according to reservoir seepage velocity; under a condition of keeping the injection concentration of the emulsifier constant, determining the optimal injection concentration of a polymer which matches the injection concentration of the emulsifier through core flooding experiments with the maximum equivalent ton oil accumulation as a target; determining total injection amount of the emulsifier and total injection amount of the polymer for implementing well group units; and optimizing injection amount of the emulsifier and the polymer in each single well by using a numerical simulator of a chemical flooding reservoir.

IPC Classes  ?

• E21B 43/16 - Enhanced recovery methods for obtaining hydrocarbons

Abstract

A method of increasing crude oil production by CO2 storage in an aquifer and dumpflooding includes the following steps. Wells are drilled in an aquifer in an oil-bearing basin for large-scale CO2 storage. A low-production and low-efficiency well in an oil-bearing stratum away from the CO2 storage injection well is selected as an artesian injection well. Formation water in the aquifer with increasing pressure is controlled and guided into the oil-bearing stratum to realize oil displacement by dumpflooding in the oil-bearing stratum.

IPC Classes  ?

• E21B 41/00 - Equipment or details not covered by groups
• C09K 8/594 - Compositions used in combination with injected gas

Abstract

This disclosure relates to the technical field of exploration geophysics, in particular to a method, a device, and a computer device for decoupling anisotropic elastic wave. The method includes: determining a set of Thomsen parameters included in an anisotropic model based on a received to-be-decomposed wave field decomposition request; transforming the set of Thomsen parameters to obtain a set of initial elastic parameters; performing S-wave and P-wave velocities separation processing for the set of initial elastic parameters to obtain a set of target P-wave elastic parameters and a set of target S-wave elastic parameters; and substituting those into the anisotropic model to process the to-be-decomposed wave field and obtain a target P-wave matrix and a target S-wave matrix. The process of decomposing S-wave and P-wave fields is simplified and the calculation cost is reduced according to the embodiments of this disclosure.

IPC Classes  ?

• G01V 1/00 - SeismologySeismic or acoustic prospecting or detecting
• G01V 1/28 - Processing seismic data, e.g. for interpretation or for event detection

Abstract

Disclosed a method for predicting permeability of a multi-mineral phase digital core based on deep learning. In the present disclosure, a three-dimensional digital core is constructed and a pore structure is randomly generated; after a plurality of multi-mineral digital core images is acquired by performing image segmentation on the three-dimensional digital core, permeability corresponding to each of the multi-mineral digital core images is acquired by simulation using multi-physics field simulation software and a multi-mineral digital core data set is constructed based on the plurality of multi-mineral digital core images and the permeability corresponding to each of the multi-mineral digital core images; an SE-ResNet18 convolutional neural network is constructed and trained with the multi-mineral digital core data set; and an image of a multi-mineral core to be predicted is input into the trained SE-ResNet18 convolutional neural network to determine the permeability of the multi-mineral core.

IPC Classes  ?

• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
• G06F 30/27 - Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model
• G06F 113/08 - Fluids

Abstract

The present disclosure a temperature-resistant and salt-resistant modified nano-graphite dispersed particle gel system with a strong self-growth effect.

IPC Classes  ?

• C09K 8/42 - Compositions for cementing, e.g. for cementing casings into boreholesCompositions for plugging, e.g. for killing wells

Abstract

A method for preventing coking in a reaction system for producing light olefins from crude oil by catalytic cracking includes: reducing temperature of oil gas discharged from a reactor, adsorbing a condensed liquid-phase oil by a spent catalyst, allowing a cooled oil gas to enter a disengager for gas-solid separation, and delivering most of the spent catalyst to the disengager. The above method is taken to avoid coking of the reaction system and to ensure stable operation of a device for a long period of time; and the high-temperature potential heat of the oil gas is fully utilized, making the energy utilization of the whole system more reasonable, and achieving the effects of energy saving and emission reduction.

IPC Classes  ?

• C10G 11/18 - Catalytic cracking, in the absence of hydrogen, of hydrocarbon oils with preheated moving solid catalysts according to the "fluidised bed" technique

Abstract

A high-efficiency yield-increasing exploitation method for natural gas hydrates includes steps of drilling of natural gas hydrate reservoirs along horizontal wells, seepage increasing by fracturing for fracture forming and stability improvement by grouting in the natural gas hydrate reservoirs, and yield improvement by combined exploitation of depressurization of the horizontal wells and heat injection; according to the present invention, drilling time is shortened by rapid drilling along the horizontal wells, the permeability of the reservoirs can be effectively improved by fracturing for fracture forming, the stability of the reservoirs can be improved by injecting foam cement slurry into the reservoirs, and the yield of the natural gas hydrates can be improved by the combined exploitation method of depressurization of the horizontal wells and heat injection.

IPC Classes  ?

• E21B 41/00 - Equipment or details not covered by groups
• E21B 7/04 - Directional drilling
• E21B 33/138 - Plastering the borehole wallInjecting into the formation
• E21B 43/24 - Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
• E21B 43/26 - Methods for stimulating production by forming crevices or fractures
• E21B 43/30 - Specific pattern of wells, e.g. optimising the spacing of wells
• E21B 49/00 - Testing the nature of borehole wallsFormation testingMethods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

Abstract

An on-line detection system for defects of an MEA is provided. The detection system includes a workbench, two connecting rods are arranged inside the workbench, two ends of the two connecting rods are both connected to two side walls of the workbench by means of bearings, and conveying rollers are fixedly arranged outside the two connecting rods in a sleeving manner. One side of the workbench is fixedly provided with a first electric motor, and an output end of the first electric motor is fixedly connected to one of the connecting rods. Belt pulleys are fixedly arranged outside the two connecting rods in a sleeving manner, and a belt is arranged outside the two belt pulleys in a sleeving manner. A hollow roller is arranged on an inner side of the workbench, and a plurality of exhaust holes are provided in a top of the hollow roller.

IPC Classes  ?

• G01N 21/89 - Investigating the presence of flaws, defects or contamination in moving material, e.g. paper, textiles
• B65H 20/02 - Advancing webs by friction roller
• G01N 21/892 - Investigating the presence of flaws, defects or contamination in moving material, e.g. paper, textiles characterised by the flaw, defect or object feature examined

Abstract

The present invention provides a bottom-hole impact-rotation stepping combined unloading rock-breaking efficient drilling system, including a housing, a drive assembly, a universal joint, a transmission shaft, a rotational impact assembly, and a drill bit; the transmission shaft is connected with the housing; the rotational impact assembly includes a rotational transmission assembly for conveying a rotational power to the drill bit and an impact assembly for providing a high frequency axial impact power to the drill bit; when the rotational transmission assembly rotates along with the transmission shaft, the impact assembly applies a high frequency impact force along a drilling axial direction to the rotational transmission assembly; an annular drill bit is disposed at an outer end of a drill bit body of the drill bit; a central drill bit is slidably disposed on an inner ring end surface of the annular drill bit; an inwardly-recessed cylindrical region is formed between a head end of the annular drill bit and a head end of the central drill bit. The present invention further provides a bottom-hole impact-rotation stepping combined unloading rock-breaking efficient drilling method. In the present invention, with entire structural disposal, stepping rock-breaking, bottom hole unloading and impact-rotation drilling can be achieved at the same time, greatly increasing the rock-breaking drilling efficiency.

IPC Classes  ?

• E21B 6/06 - Drives for drilling with combined rotary and percussive action the rotation being intermittent, e.g. obtained by a ratchet device
• E21B 10/38 - Percussion drill bits characterised by conduits or nozzles for drilling fluids

Abstract

An apparatus for preventing and controlling secondary generation of hydrates in a wellbore during depressurization exploitation of offshore natural gas hydrates includes a gas recovery pipe column, a water recovery pipe column, a gas-liquid mixed transportation pipe section, a data collecting and processing unit, and a reaction control apparatus; according to characteristics of different exploitation pipe columns, three injection pipelines and three monitoring points are arranged to predict dynamic changes in a secondary generation risk of the hydrates throughout the wellbore; measures for preventing and controlling the secondary generation of the hydrates are taken at different pipe column positions by the integrated utilization of inhibitor injection, heating for pipe columns, the additional arrangement of electric submersible pumps, and other methods.

IPC Classes  ?

• E21B 43/01 - Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
• E21B 41/00 - Equipment or details not covered by groups

Abstract

An encapsulated polymer flooding method and system for enhancing oil recovery includes: (1) determining reservoir parameters, a well deployment, and a development dynamic state of a target oil reservoir; (2) determining a near-wellbore targeted profile control area and a far-wellbore targeted viscosification area; (3) designing and synthesizing an encapsulated polymer according to conditions of the target oil reservoir; (4) evaluating and determining whether the anti-shearing performance, the sustained release and viscosification performance, the injection performance, and the profile control performance of the encapsulated polymer meet expected performance requirements based on laboratory tests; (5) formulating an injection scheme for an encapsulated polymer flooding field; and (6) monitoring the development dynamic state of the oil reservoir; according to the present disclosure, the polymer is wrapped with a shell layer, which greatly reduces the shear degradation during injection of the polymer and effectively reduces the cost.

IPC Classes  ?

• E21B 43/34 - Arrangements for separating materials produced by the well
• C09K 8/588 - Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
• C09K 8/92 - Compositions for stimulating production by acting on the underground formation characterised by their form or by the form of their components, e.g. encapsulated material

Abstract

The present invention relates to the technical field of power system distribution network fault data identification. Disclosed are a short-circuit fault section location method and system for an oilfield distribution network, a device, and a storage medium. The method comprises: using an oilfield load side measurement terminal to measure line voltage amplitudes of load side measurement nodes of a system before and after a short-circuit fault, and determining a fault type and a fault phase on the basis of features of the line voltage amplitudes of the load side measurement nodes before and after the fault; during a two-phase short-circuit, calculating the magnitude of a medium-voltage side positive sequence current fault component by combining a network topology, line parameters, and the line voltage amplitudes of the load side measurement nodes, and determining a distribution network short-circuit fault section; and during a three-phase short-circuit, performing fault section location criterion so as to determine a distribution network short-circuit fault section. According to the present invention, the short-circuit fault type is effectively determined, a fault occurrence position is subjected to section location, and ultimately, the fault is located between two adjacent load side measurement nodes.

IPC Classes  ?

• G01R 31/08 - Locating faults in cables, transmission lines, or networks

Abstract

The present invention relates to the technical field of unconventional oil and gas geology. It discloses a method and a system for quantitatively evaluating the sealing property of shale systems. Utilizing optical microscopy and field emission scanning electron microscopy, the present invention quantifies a bitumen content and pore structure parameters in a shale reservoir following qualitative identification. It classifies shale formations into four sealing types: early-stage closed and late-stage closed, early-stage closed and late-stage open, early-stage open and late-stage closed, and early-stage open and late-stage open. This classification is of significance for accurately evaluating shale preservation conditions and exploration potential. The present invention verifies the evaluations of sealing property of the shale systems by virtue of the measured formation pressures and the actual production data from shale gas wells, and is conferred with improved scientific rigor by judgment and comparison.

IPC Classes  ?

• G01N 23/2251 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by measuring secondary emission from the material using electron or ion microprobes using incident electron beams, e.g. scanning electron microscopy [SEM]
• G01N 15/08 - Investigating permeability, pore volume, or surface area of porous materials
• G01N 33/24 - Earth materials

Abstract

The present disclosure discloses superhydrophobic nanoparticles and a preparation method therefor, and a superhydrophobic nanofluid.

IPC Classes  ?

• C09K 8/584 - Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
• C09K 8/592 - Compositions used in combination with generated heat, e.g. by steam injection
• B82Y 30/00 - Nanotechnology for materials or surface science, e.g. nanocomposites
• B82Y 40/00 - Manufacture or treatment of nanostructures

Abstract

A high temperature and high salinity-resistant complementarily rigid-flexible plugging agent, a method for preparing the same, and a water-based drilling fluid and a use thereof.

IPC Classes  ?

• C09K 8/24 - Polymers
• C09K 8/42 - Compositions for cementing, e.g. for cementing casings into boreholesCompositions for plugging, e.g. for killing wells
• E21B 21/00 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor

Abstract

A method for hydrotreating and recycling waste lubricating oil, the method comprising the two steps of slurry bed pre-hydrotreatment and deep hydrotreatment, specifically as follows: mechanical impurities are removed from waste lubricating oil, and then the oil is subjected to flash distillation to separate free water and a portion of light hydrocarbons; a bottom product of the flash distillation column is mixed with hydrogen and a self-sulfurizing oil-soluble transition metal catalyst, and then enters a slurry bed reactor for pre-hydrotreatment; a liquid product obtained by performing separation on a reaction effluent is subjected to hydrocyclone separation and solvent washing to remove solid residue, and then a pre-treated lubricating oil component is obtained; said component is mixed with hydrogen and then enters a hydrofining reactor, an isomerization-dewaxing reactor, and a supplementary refining reactor, connected in series, for hydrotreatment; and the reaction products are separated to obtain high-quality naphtha, diesel oil and a lubricating base oil. The method of the present invention has such advantages as simple processing procedures, a high oil liquid yield, good lubricating oil base oil quality, and can implement full-fraction resource utilization of waste lubricating oil. In addition, the oil-soluble catalyst features simple dispersion, no need for vulcanization, a small catalyst adding amount, high low-temperature hydrogenation activity, is capable of effectively preventing the coking that could occur during a process of preheating the waste lubricating oil, and ensures long-term stable operation of the device.

IPC Classes  ?

• C10M 175/00 - Working-up used lubricants to recover useful products
• B01J 31/02 - Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
• B01J 37/04 - Mixing
• B01J 37/20 - Sulfiding
• C10G 67/14 - Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only plural serial stages only including at least two different refining steps in the absence of hydrogen
• C10N 60/02 - Reduction, e.g. hydrogenation

Abstract

The present invention provides a SAPO-34 molecular sieve with small crystal size and a hollow structure rapidly synthesized from a waste MTO catalyst and a method for preparation thereof. The method comprises of the following steps: calcining a waste MTO catalyst fine powder; mixing it with an inorganic acid solution to obtain a mixed solution; adding an organic amine and a phosphorus source to the mixed solution, and stirring it to obtain an initial gel mixture for SAPO-34 molecular sieve; crystallizing the initial gel mixture, and then drying the resultant to obtain a raw SAPO-34 molecular sieve powder; and calcining the raw powder obtained to obtain the SAPO-34 molecular sieve with small crystal size and a hollow structure. According to the present invention, the amount of the template may be reduced without additional silicon and aluminum sources, while the crystallization time may be shortened, so that the production cost of SAPO-34 molecular sieve may be reduced and the production efficiency may be improved.

IPC Classes  ?

• B01J 29/85 - Silicoaluminophosphates [SAPO compounds]
• C01B 39/54 - Phosphates, e.g. APO or SAPO compounds
• B01J 37/08 - Heat treatment
• B01J 37/04 - Mixing
• B01J 37/03 - PrecipitationCo-precipitation
• B01J 37/02 - Impregnation, coating or precipitation
• B01J 37/00 - Processes, in general, for preparing catalystsProcesses, in general, for activation of catalysts

Abstract

An oscillating shear valve of a continuous pulse generator comprises a rotator and a stator which are coaxially mounted, valve orifices are formed on the rotator and the stator, each of the valve orifices comprises a circular arc line, two straight line segments and two fillets, and is designed by establishing polar coordinate equations of the circular arc line, the straight line segments and the fillets and calculating a mud throttling area formed when the oscillating shear valve moves and determining parameters of structures of the valve orifices by a correlation coefficient index of the fluid differential pressure and a standard sinusoidal wave.

IPC Classes  ?

• H04N 5/44 - Receiver circuitry
• G06F 17/11 - Complex mathematical operations for solving equations
• E21B 21/08 - Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
• E21B 47/18 - Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid

Abstract

The present invention relates to a pre-hydrotreatment and purification method for waste lubricating oil, the method comprising the following steps: mechanical impurities are removed from waste lubricating oil, and then the oil is subjected to flash distillation to separate free water and a portion of light hydrocarbons; a bottom product of the flash distillation column is mixed with hydrogen and a self-sulfurizing oil-soluble transition metal catalyst, and then enters a slurry bed reactor for pre-hydrotreatment; a gas product obtained by performing separation on a reaction effluent is subjected to adsorption purification and then enters a hydrogen recycle compressor for cyclic use; a liquid product obtained by performing separation on a reaction effluent is subjected to hydrocyclone separation and solvent washing to remove solid residue, and finally a purified lubricating oil component is obtained. The method of the present invention has such advantages as simple processing procedures, a high non-ideal component conversion rate, a high oil liquid yield, and good quality. In addition, the oil-soluble catalyst features simple dispersion, no need for vulcanization, a small catalyst adding amount, high low-temperature hydrogenation activity, and is capable of effectively preventing the coking that could occur during a process of preheating the waste lubricating oil, markedly extending the operational lifespan of a waste lubricating oil hydrogen treatment device.

IPC Classes  ?

• C10M 175/00 - Working-up used lubricants to recover useful products
• B01D 3/06 - Flash distillation
• B01D 21/26 - Separation of sediment aided by centrifugal force
• B01D 53/04 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
• B01J 31/02 - Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
• B01J 37/04 - Mixing
• B01J 37/20 - Sulfiding
• C10G 49/04 - Treatment of hydrocarbon oils, in the presence of hydrogen or hydrogen-generating compounds, not provided for in a single one of groups , , , , or characterised by the catalyst used containing nickel, cobalt, chromium, molybdenum, or tungsten metals, or compounds thereof
• C10N 60/02 - Reduction, e.g. hydrogenation

Abstract

The present invention provides a long-lifetime SAPO-34 catalyst prepared from waste MTO catalyst as a raw material and a preparation method thereof. The method comprises the following steps: mixing the waste MTO catalyst fine powder with water; adding a phosphoric acid and an organic amine and stirring to obtain an initial gel mixture for SAPO-34 molecular sieve; crystallizing the initial gel mixture and then at least drying it to obtain a raw SAPO-34 molecular sieve powder; calcining the raw molecular sieve powder to obtain a SAPO-34 molecular sieve powder; then mixing it with a binder and a matrix carrier in water with stirring, and then aging it; and molding and then calcining it to obtain the long-lifetime SAPO-34 catalyst. The preparation method of the present invention uses MTO waste catalyst as a raw material to synthesize SAPO-34 molecular sieve in situ within a short time, and to prepare MTO catalysts having a long life and high selectivity for light olefins.

IPC Classes  ?

• B01J 38/68 - Liquid treating or treating in liquid phase, e.g. dissolved or suspended including substantial dissolution or chemical precipitation of a catalyst component in the ultimate reconstitution of the catalyst
• B01J 29/85 - Silicoaluminophosphates [SAPO compounds]
• B01J 29/90 - Regeneration or reactivation
• B01J 38/02 - Heat treatment
• B01J 38/60 - Liquid treating or treating in liquid phase, e.g. dissolved or suspended using acids
• B01J 38/50 - Liquid treating or treating in liquid phase, e.g. dissolved or suspended using organic liquids
• C01B 37/08 - Silicoaluminophosphates [SAPO compounds]

Abstract

The present invention relates to the technical field of fault positioning for a distributed power supply flexible direct current distribution network. Disclosed are a fault positioning method and system for a two-level VSC type photovoltaic dual-end flexible direct current distribution network, and an application. The method comprises: implementing fault section identification by using positive electrode current directions of direct current feeders during a fault period; establishing, according to transient stage equivalent circuits, an inter-electrode short-circuit fault ranging model covering system interactive responses; and solving fault distances by using fault electrical quantity parameter information to implement fault positioning. According to the present invention, a fault occurrence section can be correctly identified, fault accurate positioning is implemented by using fault electrical quantity parameter information, a key technology is provided for implementing quick positioning of an inter-electrode short-circuit fault of a flexible direct current distribution network, the power supply reliability of a system can be further increased, an error caused by a differential item of a traditional ranging method is effectively avoided, a positioning result is more accurate, the stability is good, the further development of the flexible direct current distribution network is facilitated to promote, and assistance is provided for construction of a novel power system under an energy transformation background.

IPC Classes  ?

• G01R 31/08 - Locating faults in cables, transmission lines, or networks

Abstract

The present invention relates to the technical field of fault location of distributed energy resources connected flexible DC distribution network, and disclosed a fault location method, system and application of bipolar short-circuit of two-level VSC-type photovoltaic-connected flexible DC distribution network, wherein, directions of positive currents of DC feeders during fault are used to locate a fault section; a bipolar short-circuit distance measurement model covering interactions and responses of systems is established according to equivalent circuits of transient periods; and fault location is done by obtaining a distance to fault with electric parameters and information of the fault. With the technical solutions offered in the present invention, accurate location of the fault can be done with the electric parameters and information of the fault, a key technology is provided for quick location of bipolar short-circuit of flexible DC distribution network, power supply reliability of the system is further improved, errors due to differentiation of the conventional distance measurement methods are effectively avoided, the location results are more accurate and of high stability, in this way, further development of flexible DC distribution network can be promoted and building of a new power system in the background of energy transition is facilitated.

IPC Classes  ?

• G01R 31/08 - Locating faults in cables, transmission lines, or networks

Abstract

A preparation method for and an application of a modified siloxane-based supercritical carbon dioxide thickener are disclosed. The method includes the following steps: using 1,3-diallyl-1,3,5-triazine-2,4,6-trione as a polymerization monomer, and dropwise adding 1,3,5,7-tetramethylcyclotetrasiloxane for hydrosilylation in the presence of a catalyst to obtain a modified siloxane polymer. The obtained modified siloxane polymer is directly used as a supercritical carbon dioxide thickener without purification post-treatment; when in use, the modified siloxane polymer is prepared into a solution with a concentration of 1-2%, has an excellent thickening effect with no cosolvent required, and has high solubility in carbon dioxide and high temperature resistance.

IPC Classes  ?

• C08G 77/50 - Macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms by carbon linkages
• B01J 23/42 - Platinum

Abstract

A hydrodynamic cavitation generating device and a method, including: a wheel disc, being provided with a plurality of flow passages, an orifice plate is provided inside the flow passages, and a throat orifice is provided on the orifice plate; a driving mechanism, being connected to the wheel disc, and configured to drive a rotation of the wheel disc; and a water-inlet pipe, being arranged fixedly, fitting with a first side end face of the wheel disc, and may inject water into the flow passage when being aligned with the flow passage; the cavitation effect obtained by using the hydraulic cavitation generating device is better.

IPC Classes  ?

• B01F 23/232 - Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles

Abstract

Provided in the present invention is a manufacturing method for polylactic acid, which method comprises the following steps: taking a lactate as a monomer raw material, and subjecting same to condensation polymerization under the action of a catalyst to obtain polylactic acid. In the method, a lactate is used as a raw material, the reaction efficiency is higher than that of the conventional dehydration polycondensation of lactic acid, the production cost is reduced, and the molecular weight and economic benefits of a polymer are increased.

IPC Classes  ?

• C08G 63/02 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds
• C08G 63/80 - Solid-state polycondensation
• C08G 63/85 - Germanium, tin, lead, arsenic, antimony, bismuth, titanium, zirconium, hafnium, vanadium, niobium, tantalum, or compounds thereof
• C08G 63/91 - Polymers modified by chemical after-treatment
• C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids

Abstract

The invention relates to the technical field of in-situ development of shale oil resources and consists of a device and technique for simulating the propagation of shale fractures under the influence of high-temperature convective heat. The apparatus is comprised of a data collecting and processing system, a high-temperature thermal fluid generator, a high-pressure pumping device, and a shale reactor. The thermal fluid generator for high temperatures consists of a fluid generator, a temperature controller, and a pressure controller. The shale, reaction kettle consists of an outer chamber, an outer chamber lid, a scaled rock cavity, and a shale sample. The outer cavity cover of the reactor is fitted with a simulated wellbore, the bottom end of the simulated wellbore penetrates the inner cavity cover and extends to the interior of the shale sample, and the top of the simulated wellbore is connected to a high-pressure constant-speed injection pump.

IPC Classes  ?

• E21B 43/26 - Methods for stimulating production by forming crevices or fractures
• G01V 99/00 - Subject matter not provided for in other groups of this subclass

Abstract

An oil well cement composite permeation enhancement agent suitable for a hydrate layer and a preparation method thereof are disclosed. In parts by weight, the composition of raw materials of the composite permeation enhancement agent is 4.6 parts-5.0 parts of kerosene, 0.23 parts-0.25 parts of emulsifier, 0.8 parts-1.1 parts of modified polypropylene fiber, 10.0 parts-12.0 parts of porous and permeable microspheres, 1.0 part-1.2 parts of paraffin, and 57.5 parts-62.5 parts of water. The composite permeation enhancement agent can effectively improve the permeability of the cement stone which reshapes the formation framework and increase the mining rate of hydrate. The oil well cement composite permeation enhancement agent has the advantages of long-term performance, low cost, and green environmental protection. The composite permeation enhancement agent of the present invention does not need secondary treatment to increase permeation, the operation is convenient and fast, and the working time of holding pressure is reduced.

IPC Classes  ?

• C09K 8/02 - Well-drilling compositions
• C04B 16/06 - Macromolecular compounds fibrous
• C04B 16/08 - Macromolecular compounds porous, e.g. expanded polystyrene beads
• C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
• C04B 111/00 - Function, property or use of the mortars, concrete or artificial stone

Abstract

The present invention belongs to the technical field of marine exploration, and discloses a forward physical simulation method for seismic response characteristics of a marine natural gas hydrate system. A physical model is established according to distribution characteristics of a hydrate system in a research area; seismic response characteristics of natural gas hydrates and underlying free gas are determined; and a seismic interpretation result of the natural gas hydrate system is corrected according to a forward physical simulation result, so that forward physical simulation of the marine natural gas hydrate system is realized.

IPC Classes  ?

• G01V 99/00 - Subject matter not provided for in other groups of this subclass
• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]

Abstract

A thermal simulation experiment method for hydrocarbon-water-rock interactions based on isotope tracing is disclosed. N-eicosane, water and feldspar grains are first heated and reacted in a high temperature high pressure (HTHP) reactor. The reactor is quenched in water to room temperature and samples from the reaction are tested to obtain the composition and content of gas products, the isotopic compositions of gas products, the water solutions and authigenic clays, the nuclear magnetic resonance (NMR) spectra of the liquid hydrocarbons and water solutions, and textures and compositions of minerals. The genetic mechanisms of mass exchange and occurrence of hydrocarbon-water-rock interactions are analyzed. A thermal simulation experiment method using multiple isotope tracing, calibrates the exchange processes and paths for H and O between the hydrocarbons, water and minerals to provide evidence for deciphering the mechanism of the organic-inorganic interactions is disclosed.

IPC Classes  ?

• G01N 30/06 - Preparation
• G01N 30/72 - Mass spectrometers
• G01N 24/08 - Investigating or analysing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
• G01N 33/24 - Earth materials

Abstract

An ultrahigh-temperature-resistant well cement system with good pumping performance, and a preparation method therefor, which belong to the technical field of well cementation engineering. The system consists of a solid component and a liquid component, wherein the solid component contains 14-70% of cement, 3-80% of silica sand, 3-80% of fly ash and 3-80% of slag powder; and the liquid component contains water and an additive. The high-temperature-resistant well cement system has a stable performance; the thickening time thereof can generally exceed 6 hours; the initial consistency is between 23.8 and 33.6 Bc; the pumping performance is good; and in addition, the strength and the liquid permeability in 2 days and 90 days are stable, such that not only can the problems of difficulty in pumping a slurry due to a large initial consistency thereof, the thickening time being short, etc., be solved, but the problems of poor long-term strength, poor high-temperature resistance, etc., of a cement system that exists in the prior art can also be effectively overcome, and the long-term sealing requirement of well cementation is satisfied.

IPC Classes  ?

• C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• C04B 111/27 - Water resistance, i.e. waterproof or water-repellent materials

Abstract

The invention relates to the field of oilfield development engineering, and discloses a self-growing gel dispersion active fluidity control system and a fluid channeling control method for a low-permeability-tight reservoir. The system contains 100 parts by weight of a self-growing gel dispersion and 0.15-0.6 part by weight of a surfactant, the self-growing gel dispersion is prepared by shearing and grinding nano-reinforced chromium-aldehyde double-group cross-linked integral gel, and the preparation method of the nano-reinforced chromium-aldehyde double-group cross-linked integral gel comprises the following steps: adding a functional polymer, a phenolic resin cross-linking agent, are organic chromium cross-linking agent and a nano-reinforcer into water, mixing, and curing. The system can be simply and rapidly prepared, is easy for deep injection by adjusting the size of gel dispersion particles, is wide in action range, high in stability and long in effective period of action, can avoid reservoir pollution, and does not affect the liquid production capacity of the reservoir. The gel dispersion particles can achieve self-growth in the low-permeability-tight reservoir fractures, and the fracture fluid channeling control effect is enhanced.

IPC Classes  ?

• E21B 33/13 - Methods or devices for cementing, for plugging holes, crevices or the like
• C09K 8/508 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds
• C09K 8/512 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
• C09K 8/584 - Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants

Abstract

A near-bit multi-parameter downhole measurement and control system while drilling, including a ground device and a downhole assembly. The downhole assembly includes a drill bit, a multi-parameter acquisition and signal transmission sub, a positive displacement motor or drilling tool, a receiving and transmitting module, a wireless communication sub, and a non-magnetic drill collar which are connected in sequence. The multi-parameter acquisition and signal transmission sub is provided with the near-bit measuring instrument. The receiving and transmitting module is configured to receive signals from the near-bit measuring instrument and transmit the signals to the wireless communication sub. The wireless communication sub is configured to transmit the received signals to the ground device through a mud pulse generator in a form of pulse signal, and the ground device decodes and analyzes downhole data. The system can monitor and adjust the real-time changes of downhole engineering parameters timely.

IPC Classes  ?

• E21B 47/13 - Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. of radio frequency range
• E21B 47/013 - Devices specially adapted for supporting measuring instruments on drill bits
• E21B 47/24 - Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid by positive mud pulses using a flow restricting valve within the drill pipe

Abstract

A subsea coiled tubing drilling system and a subsea drilling device thereof are provided. The subsea drilling device includes an underwater derrick, a well head device and a dual-roller coiled tubing device, the dual-roller coiled tubing device includes an injection head, a roller for drilling and a roller for running casing, the injection head is arranged right above the well head device, the roller for drilling and the roller for running casing are distributed on two sides of the injection head; both the drilling coiled tubing and the casing running coiled tubing are capable of respectively penetrating through the injection head and the well head device in sequence. Drilling and casing running operations can be realized on the basis of not moving the underwater derrick or changing the self structure state of the underwater derrick, and operation steps can be simplified, and the work efficiency can be improved.

IPC Classes  ?

• E21B 4/04 - Electric drives
• E21B 15/02 - Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling
• E21B 19/22 - Handling reeled pipe or rod units, e.g. flexible drilling pipes
• E21B 33/035 - Well headsSetting-up thereof specially adapted for underwater installations
• E21B 33/05 - Cementing-heads, e.g. having provision for introducing cementing plugs
• E21B 33/14 - Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
• E02D 27/52 - Submerged foundations
• E21B 15/00 - Supports for the drilling machine, e.g. derricks or masts

Abstract

The present application relates to a permeability evaluation method for hydrate-bearing sediment, including a complex conductivity spectrum obtaining step, a hydrate saturation calculating step based on the spectrum, a formation factor calculating step based on Archie's first law or from the complex conductivity real part, imaginary part and a conductivity of pore water; and a permeability calculating step based on relaxation time, hydrate saturation, hydrate occurrence mode correction factor and formation factor, or based on the polarization amplitude, hydrate saturation, occurrence mode correction factor and formation factor, or based on the CEC, hydrate saturation and occurrence mode correction factor, or based on the pore radius, fractal dimension, hydrate saturation and occurrence mode correction factor. The application allows a large measuring range, low cost and high accuracy, and can accurately obtain the permeability of hydrate-bearing sediment and effectively reflect the micro-pore structure thereof.

IPC Classes  ?

• E21B 49/08 - Obtaining fluid samples or testing fluids, in boreholes or wells
• E21B 41/00 - Equipment or details not covered by groups

Abstract

t.

IPC Classes  ?

• E21B 44/00 - Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systemsSystems specially adapted for monitoring a plurality of drilling variables or conditions
• E21B 49/00 - Testing the nature of borehole wallsFormation testingMethods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
• E21B 47/06 - Measuring temperature or pressure

Abstract

A microscopic and macroscopic evaluation method for a double-effect hydrate inhibitor, relating to the technical field of property evaluation of hydrate inhibitors. The method is also applicable to property evaluation of conventional thermodynamic inhibitors and conventional kinetic inhibitors. Double-effect hydrate inhibitors are comprehensively evaluated from microcosmic and macroscopic viewpoints by means of a microcosmic evaluation device and a macroscopic evaluation device, respectively, so that a double-effect inhibitor having excellent properties is more intuitively and efficiently screened. According to the method, the action mechanism of the double-effect inhibitor can be explained from the microcosmic viewpoint, the effects of the inhibitor in the two aspects of particle aggregation and particle adhesion can be accurately evaluated, and a theoretical basis is provided for screening of the double-effect inhibitor; moreover, the screened inhibitor can be verified by using a flow evaluation device applicable to a field working condition from the macroscopic viewpoint, so that the action effects of the double-effect inhibitor under different production parameters are obtained, and the comprehensive and multi-viewpoint property evaluation of the double-effect inhibitor is achieved.

IPC Classes  ?

• G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups
• G01N 19/04 - Measuring adhesive force between materials, e.g. of sealing tape, of coating

Abstract

The present invention belongs to the technical field of oil well cement preparation, discloses a long-term high-temperature resistant and toughened well cementing and silica-cement composite material and a preparation method. A solid component comprises cement, alumina, superfine, high-purity silica sand, a suspending agent and a toughening material according to weight fractions; the toughening material comprises a latex fiber toughening agent and a nano graphene sheet; and a liquid component is composed of water, nano iron oxide and an oil well cement admixture according to weight fractions. Cement slurry with a ratio of the present invention can achieve compressive strength reaching up to 31 MPa after being cured under a high-temperature and high-pressure environment of 200° C. and 150 MPa for one year; and the gas permeability is controlled below 0.02 mD.

IPC Classes  ?

• C09K 8/467 - Compositions for cementing, e.g. for cementing casings into boreholesCompositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
• C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• C04B 14/30 - Oxides other than silica
• C04B 14/06 - QuartzSand
• C04B 16/06 - Macromolecular compounds fibrous
• E21B 33/13 - Methods or devices for cementing, for plugging holes, crevices or the like
• C04B 14/02 - Granular materials
• C04B 111/28 - Fire resistance
• C04B 103/00 - Function or property of the active ingredients
• C04B 103/20 - Retarders

Abstract

The invention provides a collaborative optimization method for gas injection huff-n-puff parameters in tight oil reservoirs. The method relates to the technical field of oilfield development parameter optimization, including: (1) establishing the numerical simulation model that accurately describes the actual oil reservoirs; (2) determining the optimization parameters of gas injection huff-n-puff, giving the optimization range of gas injection huff-n-puff parameters and other variable constraints, and establishing an optimization objective function; and (3) using the particle swarm optimization algorithm to solve the objective function constructed based on a collaborative optimization model for gas injection huff-n-puff parameters. Then the optimal gas injection rate, gas injection time, soaking time, and production time after the collaborative optimization for gas injection huff-n-puff parameters of the reservoir are obtained.

IPC Classes  ?

• G01V 99/00 - Subject matter not provided for in other groups of this subclass
• G06F 17/11 - Complex mathematical operations for solving equations
• E21B 43/16 - Enhanced recovery methods for obtaining hydrocarbons

Abstract

The present disclosure belongs to the technical field of sewage treatment, and relates to a preparation method and use of a cobalt nanoparticle/boron nitride composite. The preparation method includes the following steps: dissolving 2-methylimidazole and boric acid in deionized water, and stirring to obtain a solution A; dissolving Co(NO3)2·6H2O and Zn(NO)3·6H2O in deionized water, and conducting ultrasonic dispersion to obtain a solution B; transferring the solution B into the solution A, and stirring to form a clear and transparent solution; transferring the clear and transparent solution into a container lined with Teflon, and conducting a reaction; subjecting an obtained product to cooling, filtration, washing, and drying sequentially to obtain a precursor of the composite; and conducting roasting on the precursor in an ammonia gas atmosphere to obtain the cobalt nanoparticle/boron nitride composite with a spherical superstructure.

IPC Classes  ?

• B01J 23/80 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups with zinc, cadmium or mercury
• B01J 27/24 - Nitrogen compounds
• B01J 35/00 - Catalysts, in general, characterised by their form or physical properties
• B01J 35/08 - Spheres
• B01J 37/04 - Mixing
• B01J 37/34 - Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves
• B01J 37/03 - PrecipitationCo-precipitation
• B01J 37/00 - Processes, in general, for preparing catalystsProcesses, in general, for activation of catalysts
• B01J 37/02 - Impregnation, coating or precipitation
• B01J 37/08 - Heat treatment
• C02F 1/72 - Treatment of water, waste water, or sewage by oxidation

Abstract

A geopolymer cementing fluid with controllable thickening time includes the following components in parts by weight: 100 parts of a cementitious material, 10 parts-30 parts of an activator, 0.2 parts-5 parts of a retarder, 0.4 parts-4 parts of an anti-settling agent, and 30 parts-70 parts of water. The geopolymer cementing fluid of the present invention has the advantages of controllable thickening time, excellent compressive strength, good settlement stability, good rheological properties, green and eco-friendly, and the like. The geopolymer cementing fluid can be better suited for the operations of oil and gas well cementing and ensure cementing safety.

IPC Classes  ?

• C09K 8/467 - Compositions for cementing, e.g. for cementing casings into boreholesCompositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
• C04B 7/26 - Cements from oil shales, residues or waste other than slag from raw materials containing flue dust
• C04B 12/00 - Cements not provided for in groups
• C04B 22/06 - OxidesHydroxides
• C04B 22/14 - Acids or salts thereof containing sulfur in the anion, e.g. sulfides
• C04B 24/04 - Carboxylic acidsSalts, anhydrides or esters thereof
• C04B 24/12 - Nitrogen containing compounds
• C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• C04B 103/10 - Accelerators
• C04B 103/20 - Retarders

Abstract

A method and system for quantitatively assessing the sealing performance of a shale system. The method comprises: assessing an early-stage sealing capability of a shale system; assessing a late-stage sealing capability of the shale system; and comprehensively assessing the sealing capability of the shale system. On the basis of an optical microscope and a high-precision field emission scanning electron microscope, quantitative statistics are compiled on the asphalt content and pore structure parameters of a shale reservoir on the basis of qualitative identification, a method for quantitatively assessing the sealing performance of a shale system is established, and the series of strata of shale are divided into four shale sealing types, i.e. early-stage sealing and late-stage sealing, early-stage sealing and late-stage opening, early-stage opening and late-stage sealing, and early-stage opening and late-stage opening, which is of great significance for the accurate assessment of shale preservation conditions and exploration potential. The evaluated sealing performance of the shale system is checked by using actually measured formation pressure and actual production data of a shale gas well, and the method is thus more scientific.

IPC Classes  ?

• G01N 21/84 - Systems specially adapted for particular applications
• G01N 23/2251 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by measuring secondary emission from the material using electron or ion microprobes using incident electron beams, e.g. scanning electron microscopy [SEM]

Abstract

The present invention relates to the technical field of friction and wear. Disclosed is a method for improving anti-friction and anti-wear properties of a substrate. The method of the present invention comprises: first, cladding the surface of a substrate with alloy powder to form a cladding layer; and then, performing texturing and sulfurizing treatment on the cladding layer in sequence to form a textured ion-sulfurized cladding layer having anti-friction and anti-wear properties on the surface of the substrate, so that the anti-friction and anti-wear properties of the substrate are improved, the use efficiency of the substrate is improved, and the service life of the substrate is prolonged.

IPC Classes  ?

• C23C 24/10 - Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
• C23C 8/08 - Solid state diffusion of only non-metal elements into metallic material surfacesChemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied

Abstract

2 particles as an emulsifier to prepare the self-phase change proppant; a proportion of different mesh numbers in the self-phase change proppant is adjusted by changing a concentration of the emulsifier during emulsification; and the chemical formula of the bio-based epoxy resin is: The proppant particles in the present disclosure have good sphericity and high fracture permeability after being laid, which can effectively extract the remaining oil in the fractures, thus improving the development efficiency of the oilfield.

IPC Classes  ?

• C09K 8/80 - Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
• C09K 8/584 - Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants

Abstract

A method, a system, and a device for full-waveform inversion deghosting for a marine variable depth streamer data acquisition are provided for solving existing problems that deghosted seismic data has low accuracy and is accompanied by artifacts due to a large error in ghost prediction. The provided method includes: acquiring seismic data, jointly solving Lippmann-Schwinger equations to obtain normal derivatives of an incident wave field and a wave field of a receiver surface, performing a wave field extrapolation by a Kirchhoff equation that includes only an integral on the receiver surface to obtain a wave field of a sea surface recorded by a horizontal streamer, calculating a ghost operator, and subjecting the ghosted wave field of the sea surface recorded by the horizontal streamer to full-waveform inversion deghosting to obtain deghosted seismic data. The provided method improves the accuracy and signal-to-noise ratio (SNR) of deghosted seismic data.

IPC Classes  ?

• G01V 1/30 - Analysis
• G01V 1/38 - SeismologySeismic or acoustic prospecting or detecting specially adapted for water-covered areas
• G01V 1/18 - Receiving elements, e.g. seismometer, geophone

Abstract

The present invention relates to a target-oriented seismic acquisition method and apparatus, a medium and a device. The target-oriented seismic acquisition method comprises the steps of: giving parameters of an initial velocity model and a three-dimensional seismic layout aiming to an underground target position; conducting wave field continuation and focusing analysis on the three-dimensional seismic layout, and calculating distribution of seismic energy on the ground in an underground target region; conducting normalization processing on distribution of the seismic energy on the ground, and then conducting level partitioning to obtain a primary energy region and a secondary energy region; adding the number of shot points in the primary energy region to achieve target-oriented acquisition, and obtaining a target-oriented inhomogeneous laying acquired data imaging result. By using the method of the present invention, automatic feedback adjustment on excitation and receiving sites and parameters thereof is achieved.

IPC Classes  ?

• G01V 1/28 - Processing seismic data, e.g. for interpretation or for event detection
• G01V 1/30 - Analysis

Abstract

A pressure compensation device with an accumulator group for controlled pressure drilling includes an electrical flat valve, a check valve, an accumulator group, a flanged pup joint and a support base. The electrical flat valve is connected to the check valve and is mounted on a top surface of the support base. The accumulator group mounted on the whole support base is a pre-storage pressure compensation device for controlled pressure drilling, and is located at a downstream position of the check valve. The liquid inlet end of the accumulator group is connected to the check valve, and the liquid discharge end is connected to the flanged pup joint.

IPC Classes  ?

• E21B 21/08 - Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
• E21B 21/01 - Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
• E21B 21/10 - Valves arrangements in drilling-fluid circulation systems
• E21B 34/16 - Control means therefor being outside the borehole
• F15B 1/02 - Installations or systems with accumulators
• F15B 1/027 - Installations or systems with accumulators having accumulator charging devices
• F15B 1/04 - Accumulators
• G05D 16/16 - Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid

Abstract

A scour-resistant interface enhancer, a preparation method, and an application thereof are provided. The scour-resistant interface enhancer is a compound solution prepared by using a 0.1% surfactant CAEO-15 and a 0.3% silane coupling agent as solutes and using clear water and absolute ethanol as solvents, where the mass ratio of clear water to absolute ethanol is 9:1. The scour-resistant interface enhancer of the present invention used as pre-flush for well cementing of coalbed methane wells has good wettability modification effect, shows scour-resistant effect against cement slurry, exhibits good compatibility with cement slurry system, and can significantly improve the cementing strength and air tightness of two interfaces of coal bed and effectively enhance the cementing quality of coalbed methane wells.

IPC Classes  ?

• C09K 8/584 - Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
• C09K 8/487 - Fluid loss control additivesAdditives for reducing or preventing circulation loss