This invention presents a projection embedded discrete fracture model integrating a TPFA and MFD hybrid approach, creating a pEDFM framework for various anisotropic two-phase flow situations. It specifies the distribution of extra pressure freedoms on matrix grids for MFD implementation, maintains f-f connections in TPFA through a standard pEDFM workflow, and introduces a low-conductivity fracture treatment for MFD. It also outlines the derivation of numerical flux calculation formulas for effective m-m and m-f connections. The mixed TPFA-MFD design applies to numerical flux estimation across both K-orthogonal and non-K-orthogonal grids, enhancing computational efficiency and facilitating the spatial discretization of continuity equations for matrix and fracture grids under anisotropic permeability conditions. A global equation system is formulated based on the continuity of effective connections, with time discretization via the implicit backward Euler method and pressure and water saturation distributions determined by a Newton-Raphson based nonlinear solver.
G06F 17/17 - Function evaluation by approximation methods, e.g. interpolation or extrapolation, smoothing or least mean square method
G06F 30/23 - Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
A method for evaluating a production potential for volume fracturing of a shale oil reservoir and determining a soaking time is discloses. The method may comprise: obtaining a core column; performing a saturated oil treatment on the core column; obtaining an initial fracture porosity parameter of the saturated oil-treated core column; soaking the core column after a CT scanning into a fracturing fluid to test the core mass increase amount at different immersion durations; obtaining the fracture porosity increase amount of the core column at different soaking times, and calculating a weight of newly added fracture porosity-fillable fracturing fluid; generating a curve of the core mass increase amount and a curve of the weight of the newly added fracture porosity-fillable fracturing fluid at different immersion durations; comparing a mass increase amount per volume unit of a core, and ranking a e mass increase amount per volume unit of the core to determine the production increase potential.
33 by means of a green and environment-friendly biological method; in addition, using the iron reducing activity of microorganisms, highly active magnetic nanoparticles are generated in situ within the reservoir by means of a green and low-cost biological method and used for oil displacement.
C09K 8/582 - 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 bacteria
E21B 43/22 - Use of chemicals or bacterial activity
4.
Asphalt-like material and preparation method and use thereof as plugging agent, and water-based drilling fluid
C09K 8/44 - Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
5.
Method for reducing pressure and increasing injection by continuous operation system of biological acid acidification and nano coating
Disclosed is a method for reducing pressure and increasing injection by continuous operation system of biological acid acidification and nano coating, specifically including composition and preparation method of biological acidizing agent and nano coating agent. The method for reducing pressure and increasing injection by continuous operation system of biological acid acidification and nano coating of the present disclosure is able to effectively dredge the stratum water flow channel, reduce the water flow resistance, and achieve the effect of high-efficiency pressure reduction and injection increase of the water injection well.
C09K 8/582 - 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 bacteria
The present disclosure provides a method and device for preparing an artificial core for petroleum geological exploration. The method includes: step 1, establishing a relation curve between a median grain diameter of quartz sand and a permeability, determining a type and a usage amount of epoxy resin, and preparing a cementing agent according to a principle that the epoxy resin has a direct ratio with a specific surface; step 2, based on a method of controlling a core permeability, preparing benchmark sand with quartz sand of different grain sizes in a certain ratio, fabricating a low-permeability core by adjusting a ratio of the benchmark sand to fine sand, and fabricating a high-permeability core by adjusting a ratio of the benchmark sand to coarse sand; step 3, separately and proportionally weighing quartz sand of different grain diameters and putting them into a magnetic tray, manually mixing and agitating for later use.
C04B 28/24 - 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 silica sols
C07C 209/60 - Preparation of compounds containing amino groups bound to a carbon skeleton by condensation or addition reactions, e.g. Mannich reaction, addition of ammonia or amines to alkenes or to alkynes or addition of compounds containing an active hydrogen atom to Schiff's bases, quinone imines, or aziranes
C07C 209/12 - Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups by substitution of halogen atoms with formation of quaternary ammonium compounds
8.
Polyaspartic acid derivative and preparation method and use thereof as lubricant, and water-based drilling fluid and use thereof
C10M 145/16 - Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate polycarboxylic
9.
DEVICE AND METHOD FOR DIAGNOSING THE RISK OF INSUFFICIENT HOLE CLEANING PROBLEM
The present disclosure provides a device and method for diagnosing risk of insufficient hole cleaning problem during drilling wells. The method includes obtaining the measured pressure via several measuring points, and obtaining actually measured value of each measuring point; calculate the theoretical pressure at each measuring points by using the real-time operational data as inputs, evaluating a hole cleaning condition by applying a difference between a theoretical pressure drop and a measured pressure drop to a developed pressure driven hole cleaning model, which gives the risk of insufficient hole cleaning problems and problematic locations. The theoretical pressure drop between two adjacent measurement points along wellbore includes the pressure drop caused by friction effect and hydrostatic effect. However, suspended cuttings in actual drilling fluid may significantly change the pressure drop along wellbore.
A method and apparatus for determining the sealability of an oil & gas well sealant fluid, whereby a cylindrical cell assembly capable of withstanding high temperature and high pressure with an electromagnetic heater positioned radially outside the cell body while partly filled with the sealant fluid. A leakage assembly in connection to the cylindrical cell assembly allows the sealant fluid to continuously flow through a leakage element at a desired differential pressure, and the residual fluid is drained into said cell by a cycling pipeline system. The real-time pressure may be recorded and transmitted to a control system including data acquisition and control units so as to monitor and measure the sealability of fluid in the downhole leakage.
The present disclosure provides a two-stroke pumping method and oil production device, and relates to the technical field of oil production. The oil production device comprises a pump body, wherein the oil production device further comprises a central tube of a hollow structure, and the central tube is partially located in the pump body and coaxially arranged with the pump body; a traveling valve and a standing valve are arranged on the left side and the right side of the outer wall of the central tube respectively, and the traveling valve is arranged between the pump body and the central tube; the standing valve is located outside the pump body; the traveling valve and the standing valve are matched with the pump body and the central tube to form an oil pumping space; and an oil pumping assembly is further arranged in the oil pumping space.
F04B 15/02 - Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
F04B 19/22 - Other positive-displacement pumps of reciprocating-piston type
A downhole displacement impact method and an impact drilling tool are provided, which relates to the field of drilling tools. The downhole displacement impact drilling tool includes a flow passing sleeve, a first main shaft, an impact-bearing seat, and a second main shaft that are all formed by annular structures and are connected in sequence from top to bottom. A vibration sleeve, a vibration starting seat, and an impact head are connected in sequence from top to bottom on the impact-bearing seat. The vibration sleeve is connected and fixed to the impact head through a connecting sleeve. The vibration starting seat synchronously rotates with the impact-bearing seat through a spline connection therebetween. The vibration starting seat generates an up-down periodic displacement along an axial direction of the vibration starting seat during rotating.
Disclosed is a device for evaluating damage of fracturing fluid to reservoir and operation method thereof, the device includes a liquid storage tank, a suction tube, a chromatography device, a bracket, a receiving container and a height adjuster; the disclosure has the following beneficial effects: since different liquids pass through the porous medium at different time and speed and the silica gel particles will not expand when immersed in the liquid, a porous structure is formed by placing silica gel particles of different sizes to simulate the pore-throat structure of unconventional oil and gas reservoirs, hence removing the influence of fracturing fluid on the hydration and expansion damage of the reservoir matrix, by testing the time and flow rate of different fracturing fluids flowing through the silica gel pores, the degree of damage caused by fracturing fluids to unconventional oil and gas reservoirs is evaluated.
The invention discloses a kind of thickening carbon dioxide displacement visual analog device, including pressure boost module, visual stirring vessel module and displacement analog module; the mentioned pressure boost module, visual stirring vessel module and displacement analog module are connected successively; the invention is used to develop the experimental study including evaluation of gas injection miscible-phase/non-miscible-phase displacement efficiency, percolation characteristics during gas displacement, mobility control technology during gas drive, and optimization of gas injection way.
4Cl, and 3%-10% of acid initiator, and the others are water, totaling 100%. The water-soluble viscosity reducing system slug, according to mass percentage, includes 0.2%-0.5% of surfactant and 2%-10% of alkali, and the others are water. The combined catalytic viscosity reducing system can effectively reduce viscosity without injecting steam, and the viscosity reduction rate can reach 96.5%.
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
17.
Device for calibrating oil-water two-phase flow sensor
Disclosed is device for calibrating oil-water two-phase flow sensor, the device includes a wellbore model, an oil-water separation mechanism, an oil-water mixing mechanism, an oil inlet mechanism and a water inlet mechanism, the oil-water separation mechanism has a mixture inlet, an oil outlet, and a water outlet. The beneficial effect of the technical scheme proposed in the disclosure is: the oil-water mixture flowing out of the wellbore model is separated by an oil-water separation mechanism, and the separated oil and water are introduced into the oil-water mixing mechanism through an oil inlet mechanism and a water inlet mechanism, respectively, for remixing, the oil-water mixture formed by re-mixing enters the wellbore model, and enters the next cycle, which can realize the reuse of oil and water, the miniaturization of the device, and reduction of the production cost of the device.
Disclosed is catalyst composition, a process for preparing the catalyst composition, and a use of the catalyst composition. The catalyst composition comprises 1 wt % to 4 wt % of free azacarbene, 1 wt % to 2 wt % of azacarbene iron, 15 wt % to 30 wt % of a phase transfer catalyst, 1 wt % to 5 wt % of a hydrogen donor, 5 wt % to 10 wt % of phosphoric acid, 0.5 wt % to 1 wt % of emulsifier, with the rest being solvent. This disclosure also provides a process for preparing the catalyst composition, comprising: mixing the free azacarbene and the azacarbene iron with the solvent according to a ratio, then adding and mixing the phase transfer catalyst and the hydrogen donor, then adding and mixing the phosphoric acid and the emulsifier to obtain the catalyst composition. The beneficial effect of this disclosure is: only less azacarbene iron and free azacarbene are needed to achieve rapid and efficient viscosity reduction of heavy oil.
A catalyst composition, a preparation method therefor and the use thereof. The present invention belongs to the technical field of viscosity reduction exploitation of heavy oil. The catalyst composition comprises the following components in percentages by mass: 1-5 wt% of free N-heterocyclic carbene, 1-2 wt% of N-heterocyclic carbene iron, 15-30 wt% of a phase transfer catalyst, 1-5 wt% of a hydrogen donor, 5-10 wt% of phosphoric acid, and 0.5-1 wt% of an emulsifier, with the balance being a solvent, adding up to 100%. The method for preparing the catalyst composition comprises: mixing free N-heterocyclic carbene and N-heterocyclic carbene iron with a solvent, adding a phase transfer catalyst and a hydrogen donor, mixing same, adding phosphoric acid and an emulsifier, and mixing same to obtain the catalyst composition. The catalyst composition or the catalyst composition prepared by means of the preparation method can be applied to the treatment of a heavy oil, and rapid and efficient viscosity reduction of heavy oil can be realized with only relatively small amounts of N-heterocyclic carbene iron and free N-heterocyclic carbene.
244Cl, and 3-10% of an acid initiator, the remainder being water, all of which totals 100%. According to mass percentage, a water-soluble viscosity reducer comprises 0.2-0.5% of a surfactant, and 2-10% of a base, the remainder being water, all of which totals 100%. A gas injected in the gas injection slug is nitrogen or carbon dioxide. Also comprised is an application of the combined catalytic viscosity reducer in degrading heavy oil, the combined catalytic viscosity reducer being highly effective in viscosity reduction without the need for steam injection, the viscosity reduction rate being up to 96.5%.
C09K 8/42 - Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
C09K 8/44 - Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
C09K 8/514 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
22.
Temperature-responsive self-degradable temporary plugging agent and preparation method thereof as well as its application in plugging the wellbore
The present disclosure provides a temperature-responsive self-degradable temporary plugging agent and a preparation method thereof as well as its application in plugging the wellbore, which relates to the technical field of oilfield exploitation. The temporary plugging agent provided in the present disclosure includes preparation raw materials of the following mass percentages: monomer 4-6%, crosslinker 0.2-1%, initiator 0.02-0.06%, degradation catalyst 0.05-0.1%, chain transfer agent 0.01-0.05%, and the balance water. The temporary plugging agent of the present disclosure is liquid before gelling, with a low viscosity and a good fluidity, and easy to be pumped. When being pumped into the wellbore, the temporary plugging agent may crosslink at the temperature of the reservoir section, with good gelling properties. At the end of the operations, it can be degraded by itself, without drilling tools, with no need for gel breaking, and with no need for additional degradation promoters.
C09K 8/42 - Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
C09K 8/44 - Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
23.
Enhanced oil recovery method with single well huff and puff and inter-segment oil displacement after horizontal well fracturing
An enhanced oil recovery method includes: screening out implementation well that meet the requirements of a preset standard; selecting the target interval that can be used for enhanced oil recovery in the implementation well; obtaining the reservoir parameters and perforation parameters of the target interval, so as to divide the target interval into several groups of swallowing and exhaling segments, injecting the infection liquid containing and simmer the well for a period of time; and after the well simmering, the oil-water mixture replaced by the injection fluid is produced from each exhaling segment.
E21B 43/16 - Enhanced recovery methods for obtaining hydrocarbons
C09K 8/582 - 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 bacteria
E21B 43/26 - Methods for stimulating production by forming crevices or fractures
24.
Intelligent quantitative microscopic identification system and intelligent identification method for whole rock polished sections
The invention provides an intelligent quantitative microscopic identification system for whole rock polished sections, which can greatly improve the collection efficiency of whole rock polished sections by adopting a microscopic collecting apparatus. In a preferable technical solution, the microscopic collecting apparatus is combined with the production line for the automatic preparation of whole rock polished sections to form an integrated system, which realizes an automatic solution from preparation to collection, therefore further improves the production and collection efficiency of whole rock polished sections, and which can cope with production, image collection and automatic scanning and splicing of mass whole rock polished sections, so it greatly improves the collection efficiency of the microscopic images of organic components for whole rock polished sections. People can collect 500 to 1000 sample pieces of whole rock polished sections in 12 hours by adopting the solution of the invention.
Disclosed is a directional well trajectory control method based on drill pipe drive, the method including the following steps: parameters down-transmission, determining the offset vector, closed loop control of eccentric ring rotation angle, and well parameter closed-loop control; this method can achieve three-dimensional well trajectory control without frequent trips during drilling operations, and has a high penetration rate, good wellbore cleaning effect, well trajectory control accuracy, high flexibility, low tripping times, high borehole quality, high safety, etc., which is suitable for the development of special process wells such as medium-deep wells, ultra-deep wells, ultra-thin oil layer horizontal wells and unconventional oil and gas wells in China's complex oil and gas reservoirs. This method can also achieve precise control of well trajectory, and overcome the shortcomings of existing control methods that cannot achieve closed-loop control and cannot remove interference signals.
E21B 49/00 - Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
26.
Automatic rheological parameter measuring system and use method for flowing drilling fluid with high temperature and high-pressure
The disclosure relates to an automatic measuring system and a method thereof for drilling fluid parameters measurement. The system includes i. mud container, configured for test drilling fluid preparation and samples collection; ii. heat jacket, configured to keep the drilling fluid in the tank warm iii. heat exchanger, configured to simulate the practical conditions; iv. plunger pump, configured to pump the test drilling fluid to the flowing test device; v. flow test device, configured to simulate the flowing states of drilling fluid in the borehole annulus and drilling string, and also measure the pressure and flow rate of drilling fluid vi. control module, configured to obtain rheological parameters and the best rheological mode of the drilling fluid in the borehole annulus and drilling string based on the pressure and flow rate.
G01N 11/00 - Investigating flow properties of materials, e.g. viscosity or plasticity; Analysing materials by determining flow properties
E21B 21/08 - Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
G01N 11/02 - Investigating flow properties of materials, e.g. viscosity or plasticity; Analysing materials by determining flow properties by measuring flow of the material
Disclosed is a drillable adaptive turbine guide shoe, including an adaptive booster component and a power casing shoe component; the adaptive booster component includes a supercharging hollow shaft, a supercharging shell, a disc spring group, a shunt head, a jet oscillator and a semi-cylindrical ring, the supercharging hollow shaft is slidably connected to the supercharging shell, one end of the supercharging hollow shaft is a liquid inlet end and the other end is closed, a cavity is formed between the supercharging hollow shaft and the supercharging shell, and the disc spring group is built in the cavity, the jet oscillator and the semi-cylindrical ring are mounted on the inner wall of the supercharging shell, and one side of the jet oscillator and the semi-cylindrical ring abuts against the shunt head, the shunt head is sleeved on the outer wall of the supercharging hollow shaft; this disclosure solves the problem that the casing cannot be effectively run when the wellbore has sand bridges or wellbore necking.
The present disclosure relates to a profile control and oil displacement agent for an oil reservoir and a preparation method thereof. The profile control and oil displacement agent is prepared by uniformly dispersing polymer microspheres, an activator and a solvent. The polymer microspheres are micron-sized dry-powdered microspheres, which are prepared by stirring and polymerizing a first monomer, a second monomer, an initiator, a hydrophobic nano-powder and water in a specific proportion. The profile control and oil displacement agent of the present disclosure can reduce the oil-water interfacial tension, has good long-term stability, simple preparation and low cost, avoids solvent waste, and can be applied to the deep profile control and oil displacement system of oil fields.
C09K 8/512 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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
29.
Brevibacillus agri, preparation thereof, method for preparing surfactant and use thereof
Brevibacillus agri and its preparation may effectively enhance the crude oil recovery; the method for preparing the surfactant allow the lipopeptide biosurfactant to have good physical properties, effectively reduce the surface tension, and have good emulsifying performance for petroleum, various hydrocarbons and lipids.
Brevibacillus borstelensis-fermented mixed lipopeptide solution, 15 to 30 parts of a compound biological enzyme, 10 to 20 parts of a plant-based nonionic surfactant, and 1 to 5 parts of a stabilizer to a reactor; and step 2: adding 1 to 5 parts of an antibacterial agent and an alcohol solvent to the reactor, and stirring a resulting mixture for 60 min to 120 min.
C09K 8/582 - 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 bacteria
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
Disclosed are a double-response self-degradable temporary plugging agent and a preparation method thereof. The double-response self-degradable temporary plugging agent is prepared by compounding a crosslinkable monomer with a temperature-sensitive degradability and an inorganic material with an acid solubility with a first monomer, a dispersant, an initiator and water, and subjecting the resulting mixture to a polymerization.
The present disclosure provides a method, medium, terminal and device for evaluating a layered water injection efficiency of an oil reservoir. This method includes: simplifying an oil reservoir system into a network of interconnected nodes that considers a series of complex geological characteristics such as well points, water bodies and faults, and constructing an inter-well connectivity network model characterized by two inter-well connectivity parameters of conductivity and connected volume, thereby simplifying the reservoir into a group of connected units composed of single wells; and calculating an injected water splitting coefficient of an injection well in each layer, and increasing or decreasing the injection according to a water injection efficiency of the injection well in each layer and an average water injection efficiency of the same layer. The present disclosure reduces the parameter dimension required to be solved, and greatly reduces the calculation and fitting time.
The present invention provides a subculture breeding method for thorn-free zanthoxylum bungeanum maxim tissue culture seedlings, and belongs to the technical field of vegetative propagation of commercial crops. The subculture breeding method specifically comprises the following steps: primary culture, cutting, and subculture multiplication culture. The subculture multiplication culture is finished until the PPM usage amount in a culture medium is reduced to 0, and the number of generations of the subculture multiplication culture is not less than 4. According to the present invention, by properly adjusting the composition of components of the culture medium according to the number of subcultures and comprehensively researching factors such as a cutting process, so that subculture multiplication of stem segments of primary culture of the thorn-free zanthoxylum bungeanum maxim is rapidly and stably realized, and furthermore, large-scale breeding is realized in a short time.
A multi-point geostatistical prestack inversion method based on a renewal probability ratio constant theory, comprising the following steps: sorting information, work area gridding and distributing well data, assigning an initial attribute value to a simulation work area, selecting a data template with an appropriate size, inversion and judging iteration termination; the method overcomes the defects that in the prior art, oil and gas exploration and development are more and more difficult, exploration degree is higher and higher, new oil and gas reservoirs are more and more difficult to find, reservoir parameters are inaccurate, and exploration uncertainty is increased, and the method has the advantages that prior information is obtained through a multi-point geostatistics method and then screening is carried out through a minimum objective function such that the complexity of seismic inversion is reduced.
A multipoint geostatistical pre-stack inversion method based on an updated theory of permanence of probability ratio, comprising the following steps: organizing data, gridding a work area, distributing well data, assigning an initial attribute value to a simulated work area, selecting a data template of a suitable size, and terminating inversion and determination iteration. A priori information is acquired by utilizing the multipoint geostatistical method, and then filtered via a minimum target function, thus reducing the complexity of seismic inversion, and increasing the precision of storage layer inversion.
The invention discloses a carboxymethyl inulin graft polymer scale and corrosion inhibitor and a preparation method thereof. The main chain of the carboxymethyl inulin graft polymer scale and corrosion inhibitor consists of the following repeating unit (I):
in the repeating unit (I), x:y=(20˜80):(20˜80); the range of z is from 2 to 70, the degree of carboxymethyl substitution is from 1.5 to 2.5. The beneficial effect of the technical scheme proposed in the present invention is: it has excellent scale inhibition and corrosion inhibition properties; the monomers are cheap and easily available; the reaction conditions are mild and easy to control; at the same time, the monomer raw materials don't contain phosphorus and nitrogen, and are environmentally friendly.
Disclosed is a modified circular ring turbine. The modified circular ring turbine comprises a shell assembly (100) and a rotor assembly (200). The shell assembly (100) is provided with a rotation cavity (111), the rotor assembly (200) is arranged inside the rotation cavity (111), and the rotor assembly (200) comprises a rotating shaft (210), a plurality of rotating sheets (220), two clamping sheets (230) and a supporting circular pipe (250). The rotating shaft (210) is rotatably connected to the shell assembly (100), the rotating sheets (220) and the two clamping sheets (230) all are sleeved on the rotating shaft (210), a clamping gap is formed between the two clamping sheets (230), the plurality of rotating sheets (220) are arranged in a stacked manner and located in the clamping gap, the supporting circular pipe (250) is sleeved the rotating shaft (210), and two ends of the supporting circular pipe (250) are respectively clamped to clamping grooves (231) provided on the two clamping sheets (230); and the rotating sheet (220) is a circular ring, one side of the rotating sheet (220) is provided with a plurality of protrusions (222), the plurality of protrusions (222) are uniformly arranged in the circumferential direction of the rotating sheet, each of the protrusions (222) is close to an inner circle of the circular ring, an airflow pipeline is formed between the two adjacent protrusions (222), and the thickness of the protrusion (222) is equal to a gap between two adjacent rotating sheets (220). The problems in the prior art whereby airflow kinetic energy is not able to be fully used, and a rotor is exposed and thus causes potential safety hazards are solved.
F01D 1/36 - Non-positive-displacement machines or engines, e.g. steam turbines characterised by non-bladed rotor, e.g. with drilled holes using fluid friction
38.
Three-dimensional cage-like hyperbranched monomer, and preparation method and application thereof
The invention discloses a three-dimensional cage-like hyperbranched monomer and preparation method and application thereof. The three-dimensional cage-like hyperbranched monomer has the structural formula I:
3. The beneficial effect of the technical scheme proposed in the present invention is: by introducing easily polymerizable olefin groups, the carboxyl group and amide group are combined in the three-dimensional cage-like hyperbranched monomer to make the water solubility good, and it can be copolymerized with many other monomers to obtain the three-dimensional cage-like hyperbranched polymer; when used as an additive for wellbore working fluids, due to the hyperbranched structure of the polymer, it has good salt and temperature resistance, and also has viscosity increasing, filtration loss, and flocculation properties; meanwhile, the synthesis method is simple and the cost is low.
A61K 31/197 - Carboxylic acids, e.g. valproic acid having an amino group the amino and the carboxyl groups being attached to the same acyclic carbon chain, e.g. gamma-aminobutyric acid (GABA), beta-alanine, epsilon-aminocaproic acid, pantothenic acid
C08G 83/00 - Macromolecular compounds not provided for in groups
The direction-of-arrival estimation and mutual coupling calibration method and system with arbitrary sensor geometry and unknown mutual moupling are disclosed, a direction-of-arrival estimation and mutual coupling calibration method with arbitrary sensor geometry and unknown mutual moupling, comprising the following steps: acquiring an array signal, and then estimating a covariance matrix according to the array signal, a noise subspace is obtained by eigendecomposition of the covariance matrix; determining the angle search range of DOA, and generating a group of grids according to the angle search range of DOA, based on the noise subspace and the mutual coupling matrix between the elements, and obtaining a spectrum function corresponding to each grid; Estimating DOA based on the peak value of spectrum function corresponding to each grid, and obtaining the mutual coupling coefficient between the array elements from the DOA. The DOA estimation and mutual coupling calibration of arbitrary array manifold under the condition of mutual coupling are realized simply.
H04B 7/08 - Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
H04B 17/21 - Monitoring; Testing of receivers for correcting measurements
H04B 17/336 - Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
The present invention relates to the technical field of power generation apparatuses, and disclosed is an offshore oscillation water column power generation ship, comprising a housing, a flexible bag, at least one power generation assembly, and air collecting housings. The flexible bag is built in the housing, the flexible bag and an inner wall of the housing enclose an accommodating cavity, and the accommodating cavity is filled with liquid; each power generation assembly comprises at least one generator and blades, the generators are built in the housing, and the blades are connected to rotors of the generators, the air collecting housings are built in the housing, the air collecting housings, the flexible bag, and the inner wall of the housing are enclosed to form an air collecting cavity, the air collecting housings are provided with a flow channel, the flow channel penetrates through the air collecting housings, one end of the flow channel is in communication with the air collecting cavity, and the other end of the flow channel is opposite to the blades. The present invention can effectively utilize the sea wave energy to generate electricity.
F03B 13/24 - Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy to produce a flow of air, e.g. to drive an air turbine
B63B 35/44 - Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
41.
Temperature-resistant and anti-collapse multi-branched polymer fluid loss reducer and preparation method thereof
A main chain of a temperature-resistant and anti-collapse multi-branched polymer fluid loss reducer is composed of the following repeating unit (I):
2 groups are alkylamines having a multi-branched structure. The beneficial effect of the multi-branched polymer fluid loss reducer is: introducing cheap acrylamide branch monomer into the polymer monomer system of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid, the preparation process is simple, the reaction conditions are mild, and the production cost is significantly reduced.
The invention discloses a dolomite reservoir prediction method and system based on well and seismic combination, and storage medium. The method steps include: obtaining the dolomite index characteristic curve through well log sensitivity analysis, and distinguishing the dolomite and limestone according to the difference in their response range; after the artificial intelligence deep learning is performed on the dolomite index characteristic curve of the drilling area, the dolomite index characteristic curve of the virtual drilling area is obtained; according to the dolomite index characteristic curve of the drilling area and the virtual drilling area, the post-stack seismic data is used for inversion to obtain the distribution and development status of the dolomite reservoir in the test area. The invention effectively distinguishes the dolomite and limestone through the dolomite index characteristic curve, and accurately predicts the distribution and development status of the dolomite reservoir in the test area with less wells.
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
E21B 47/14 - 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
G01V 1/36 - Effecting static or dynamic corrections on records, e.g. correcting spread; Correlating seismic signals; Eliminating effects of unwanted energy
43.
Mud circulation system for reducing the swab pressure while tripping out
The invention provides a mud circulation system for reducing swab pressure while tripping out, including drilling tool components, a normal drilling circulation channel and a tripping circulation channel, the drilling tool components include a drill string, a drill bit, and a top drive, the normal drilling circulation channel includes a first rotary valve, a solid phase control device, a mud tank, a mud pump, and a forth rotary valve connected in sequence, the tripping circulation channel includes a second rotary valve, a tripping mud pump, a tripping mud tank and a third rotary valve connected in sequence; the mud circulation system for reducing the swab pressure is operated to: shut down the mud pump, close the first rotary valve, and open the second rotary valve and the third rotary valve before tripping out; determine the pumping flow rate according to relevant parameters.
E21B 21/08 - Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
E21B 21/12 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
E21B 21/10 - Valves arrangements in drilling-fluid circulation systems
E21B 47/22 - 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 negative mud pulses using a pressure relief valve between drill pipe and annulus
E21B 19/08 - Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
E21B 21/00 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
E21B 49/00 - Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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 systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
E21B 21/06 - Arrangements for treating drilling fluids outside the borehole
A sulfur- and phosphorus-free extreme pressure lubricant and a preparation method thereof is disclosed. The lubricant is prepared by using Turkey red oil, a cyclic anhydride compound, triethanolamine, nano polytetrafluoroethylene powder, an alcohol compound, and water as raw materials. The lubricant does not contain hazardous substances such as sulfur and phosphorus. This reduces the harm to the environment, equipment, and human body, and conforms to the development trend of modern industrial production. Moreover, the lubricant has excellent extreme pressure performance, and can effectively reduce the downhole friction and torque, thereby meeting the construction requirements of extended reach wells and horizontal wells.
C10M 105/72 - Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing sulfur, selenium or tellurium
C10M 161/00 - Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
C10M 177/00 - Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
C10N 40/00 - Specified use or application for which the lubricating composition is intended
C10N 30/06 - Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
C10N 50/08 - Form in which the lubricant is applied to the material being lubricated solid
45.
Composition for preparing anti-wear lubricant for drilling fluid and preparation method of anti-wear lubricant for drilling fluid and drilling fluid
CNPC RESEARCH INSTITUTE OF SAFETY AND ENVIRONMENTAL TECHNOLOGY CO., LTD. (China)
Inventor
Xu, Mingbiao
You, Fuchang
Li, Xingchun
Wu, Jiao
Hou, Shanshan
Shu, Man
Abstract
This pertains to the technical field of lubricants, and particularly relates to a composition for preparing a wear-resistant drilling fluid lubricant, a preparation method of the wear-resistant drilling fluid lubricant and a drilling fluid. Vegetable oil, nanometer calcium borate, an ether compound and an amine compound may be used as raw materials to prepare drilling fluid lubricant with excellent abrasion resistance by reasonably controlling dosages of the raw materials. The lubricant provided can improve wear resistance, lubricating property, and high temperature resistance of bentonite slurry and water-based drilling fluid.
A three-dimensional hydraulic oscillator includes an upper casing, a lower casing screwed with the upper casing, an upper joint screwed with the upper casing, a lower joint screwed with the lower casing and a screw. An upper rotating shaft is mounted in the upper casing. A turbine group is mounted on the upper rotating shaft. An upper cam is fixed to the upper rotating shaft. A lower cam is movably mounted in the upper casing. The upper cam contacts with the lower cam. The screw is mounted in the upper casing and fixed to the lower cam. A lower rotating shaft is mounted in the lower casing. An eccentric block is fixed on the lower rotating shaft. A lower roulette is fixed to the lower rotating shaft. A shaft cap is disposed above the lower roulette. An upper roulette is mounted on the screw and meshed with the lower roulette.
E21B 28/00 - Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
E21B 7/24 - Drilling using vibrating or oscillating means, e.g. out-of-balance masses
B06B 1/18 - Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
E21B 7/124 - Underwater drilling with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors
A multi-stage fracturing sliding sleeve is provided, which comprises a fracturing pipe, a shear slip device, a fracturing sleeve, a ball seat support, a first sliding sleeve and a limiting sleeve, the fracturing sleeve seals fracturing ports, the ball seat support and the fracturing pipe are connected through at least one first shear pin, a first spring is arranged between the first sliding sleeve and the limiting sleeve, a second sliding sleeve is arranged below a multi-segment ball seat and connected with the first sliding sleeve, an outer wall of the first sliding sleeve comprises a downward facing annular shoulder, an inner wall of the limiting ring comprises an upward facing annular shoulder, the first spring is located between the downward facing annular shoulder and the upward facing annular shoulder, and an upper end face of the limiting ring limits the axial travel of the first sliding sleeve.
E21B 43/26 - Methods for stimulating production by forming crevices or fractures
E21B 34/14 - Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
E21B 34/10 - Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
48.
Water-based drilling fluids for deepwater drilling and use thereof
CNOOC China Limited, Zhanjiang Branch, Guangdong (China)
Inventor
Xu, Mingbiao
Li, Zhong
You, Fuchang
Li, Yanjun
Liu, Hexing
Zhou, Shanshan
Abstract
A water-based drilling fluid for deepwater drilling includes 0.1%-1.0% by weight of a viscosifier, 0.1%-1.0% by weight of an acidity regulator, 0.5%-3.5% by weight of a filtrate loss reducer, 0.5%-1.5% by weight of a low-temperature yield point enhancer, 1.0%-5.0% by weight of a shale inhibitor, 15%-25% by weight of a hydrate inhibitor, 1.0%-3.0% by weight of a lubricant, 5.0%-10.0% by weight of a temporary plugging agent and seawater.
A multifunctional slick water concentrate, is obtained by “W/W” dispersion polymerization at elevated temperature, wherein water-soluble monomer A1, water-soluble fluorocarbon surfactant A2, water-soluble quaternary ammonium clay stabilizer A3, water-soluble dispersant A4, water-soluble free radical initiator A5, inorganic salt A6 and water A7, is first formed a homogeneous system under mechanical agitation; wherein, the percentage of the weight of each respective component, relative to the total weight of the reaction system, is as the following: water-soluble monomer A1: 5.0-20.0%; water-soluble fluorocarbon surfactant agent A2: 0.1-5.0%; water-soluble quaternary ammonium clay stabilizer A3: 0.1-20.0%; water-soluble dispersant A4: 0.1-10.0%; water-soluble radical initiator A5: 0.000001-0.100%; inorganic salt A6: 15.0-40.0%; water A7: remainder.
C09K 8/05 - Aqueous well-drilling compositions containing inorganic compounds only, e.g. mixtures of clay and salt
B01F 17/00 - Use of substances as emulsifying, wetting, dispersing, or foam-producing 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
C09K 8/88 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds
C11D 1/00 - Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
Oil-phase-free triple-play slick water concentration system with effects of synergistically reducing drag, assisting drainage and promoting clay stabilization
An oil-phase-free triple-play slick water concentration system, is characterized by first synthesizing a water-soluble dispersion polymer drag reducer A; and then preparing an inorganic salt solution B, under mechanical agitation, of high-performance water-soluble fluorocarbon surfactant and a water-soluble of high-performance small molecule or macromolecule clay stabilizer containing quaternary ammonium ions; and finally, the aqueous inorganic salt solution B is slowly added to the drag reducer dispersion A, wherein the ratio of the aqueous inorganic salt solution B and the dispersion A is 20-80:80-20.
C09K 8/05 - Aqueous well-drilling compositions containing inorganic compounds only, e.g. mixtures of clay and salt
B01F 17/00 - Use of substances as emulsifying, wetting, dispersing, or foam-producing 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
C09K 8/88 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds
C11D 1/00 - Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
A combo hydraulic fracturing fluid concentrate, is characterized by 1) firstly preparing “water-in-water” dispersion polymer drag reducer A, which is synthesized via dispersion polymerization to obtain water-soluble macromolecular colloidal particles dispersed in an aqueous solution of inorganic salts; 2) secondly, adding a dispersion B, which is a polymeric viscosifier, having shear-thinning properties, dispersed in aqueous inorganic salt solution; wherein the percentage by weight of drag reducing agent to viscosifier dispersion B is 20-80:80-20.
A reverse emulsion-based slick water concentration system, wherein the reverse emulsion is obtained by dispersing an aqueous phase A to an oil phase B under mechanical agitation; wherein the aqueous phase A is composed of a water-soluble monomer A1, a water-soluble fluorocarbon surfactant A2, a water-soluble quaternary ammonium clay stabilizer A3 and water A4; wherein the oil phase B comprises an oil-soluble dispersant/surfactant B1, an oil-soluble radical initiator B2 and a hydrophobic solvent B3 as a dispersing medium; wherein, the percentages of each component described above, relative to the total weight of the reaction system is as the following: water-soluble monomer A1: 5.0-30.0%; water-soluble fluorocarbon surfactant A2: 0.1-5.0%; water-soluble quaternary ammonium clay stabilizer A3: 0.1-15.0%; water A4: 5.0-35.0%; oil-soluble dispersant/surfactant B1: 0.1-5.0%; oil-soluble radical initiator B2: 0.000001-0.100%; hydrophobic solvent B3: remainder.
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 8/88 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds
C11D 1/00 - Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
53.
DOWNHOLE TIME-DOMAIN PULSED ELECTROMAGNETIC METHOD FOR DETECTING RESISTIVITY OF STRATUM OUTSIDE METAL CASED PIPE
Disclosed is a downhole time-domain pulsed electromagnetic method for detecting the resistivity of a stratum outside a metal cased pipe and having steps of: 1) constructing a high-power pulse emission source in the well; receiving time-varying data of an induced electromotive force ε generated by a magnetic-field vertical component Bz and recorded by a recording system; recording simultaneously a transmission waveform and a reception signal; 2) performing a plurality of transmission/reception, superpositioning a signal, increasing a signal-to-noise ratio; 3) calculating a cased pipe response on the basis of a cased pipe parameter and a recorded emission source current waveform; acquiring a relatively induced electromotive force Δεƒ of the stratum outside the cased pipe; 4) calibrating the relatively induced electromotive force; 5) performing an one-dimensional inversion, converting a time-varying observation signal into radial change information of resistivity of the stratum around the well; 6) on the basis of a inversed resistivity value, acquiring a two-dimensional image in the vertical direction and radial direction of the resistivity of the stratum outside the cased pipe in the well section; and 7) on the basis of the measurement data and interpretation result when the well is completed; determining the distribution state of oil remaining in a reservoir layer by using the resistivity of the reservoir layer outside the cased pipe.
E21B 47/12 - 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
E21B 49/00 - Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
G01V 3/28 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device using induction coils
A downhole high-power electromagnetic pulse emission apparatus comprising a ground instrument (1) and a downhole instrument (2). The core of the ground instrument (1) is an industrial personal computer and is constituted by three modules, namely, a depth/magnetic marker/GPS signal recording module, a Manchester encoder-decoder module, and a cable driving module. The depth/magnetic marker/GPS signal recording module and the Manchester encoder-decoder module respectively are connected to the industrial personal computer via two ports. The cable driving module is connected to the downhole instrument (2) via a cable and uses the principle of phantom power. Sequentially arranged within the downhole instrument (2) are alternating current voltage-booster module, an energy storage capacitor, an emission coil, a data collection module, also arranged are a high-voltage discharge switch and a computer-controlled controller. The downhole instrument (2) is powered via the cable by the ground instrument (1). The downhole high-power electromagnetic pulse emission apparatus allows for triggering of instantaneous high-power pulsed electromagnetic field in a cased well, around-the-clock data recording of downhole emission waveform and reception signal, and providing observation system for a downhole electromagnetic detection method for evaluating the distribution state of oil remaining in a oil-reservoir layer for extraction.
E21B 49/00 - Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
G01V 3/30 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation specially adapted for well-logging operating with electromagnetic waves
patents
