A well tool device may include a first subsection and a second subsection connected to each other. The first subsection comprises a first connector having an outwardly facing first connection interface and the second subsection comprises a second connector having an inwardly facing second connection interface, where the second connector is provided radially outside of the first connector. The first connection interface is facing towards the second connection interface. The first connection interface comprises a first recess provided in the first connector. The second connection interface comprises a second recess provided in the second connector. The first and second recesses together are forming a bolt compartment. The well tool device further comprises a locking bolt provided in the bolt compartment formed by the first and second recesses in order to connect the first and second subsections to each other. The bolt compartment formed by the first and second recesses has an opening in the outer surface of the second connector.
E21B 17/046 - CouplingsJoints between rod and bit, or between rod and rod with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
E21B 17/03 - CouplingsJoints between drilling rod or pipe and drill motor, e.g. between drilling rod and hammer
2.
Anchor module, casing plug assembly and method for operating a casing plug assembly in a well pipe
A casing plug assembly and method for performing an operation in a well pipe includes a running tool for connection to a drill pipe, an equalizing module, a seal module, and an anchor module. A continuous fluid channel is formed through the casing plug assembly. The anchor module is set in the well pipe by pumping fluid through the continuous fluid channel. The anchor module is, in the set state, providing a support in the well pipe used by the running tool to operate the seal module.
E21B 23/01 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
E21B 23/04 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
E21B 23/06 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
E21B 33/128 - PackersPlugs with a member expanded radially by axial pressure
E21B 33/129 - PackersPlugs with mechanical slips for hooking into the casing
3.
Supporting device for a sealing element in well plug
A sealing device for a well plug includes a mandrel device, a sealing element, a first supporting device provided on a first side of the sealing element and a second supporting device provided on a second side of the sealing element. Each supporting device includes proximal supporting elements provided proximal to the sealing element and distal supporting elements, where first ends of the respective proximal and distal supporting elements are pivotably connected to each other. The second ends of the proximal supporting elements are pivotably connected to a connector of a proximal supporting ring. The sealing device is brought from a run state to a first set state by relative axial movement of the distal supporting rings towards each other and relative axial movement of the proximal supporting rings towards each other.
A well tool device includes a mandrel device, a sealing element and upper and lower supporting devices. The well tool device may be configured between a run state, in which the sealing element is radially retracted, and a set state, in which the sealing element is radially expanded. The well tool device further includes a pressure distribution device for distributing the pressure on the sealing element in the set state via the upper and lower supporting devices. The pressure distribution device includes a sleeve device provided radially outside the mandrel device and radially inside the sealing element, where the sleeve device is axially displaceable in a sleeve compartment in relation to the mandrel device and the sealing element. The sleeve device includes an upper protrusion for applying a downwardly directed axial force to the upper supporting device when the sleeve device is in its lower position.
A releasable ratchet device, including a mandrel device with a grooved area and a locking device including locking grooves configured to be engaged with the grooved area of the mandrel device. The releasable ratchet device may be configured to be in a locked state, in which axial movement between the mandrel device and the locking device is allowed in a first direction when the locking device is engaged with the mandrel device and movement between the mandrel device and the locking device is prevented in a second direction opposite of the first direction when the locking device is engaged with the mandrel device. The releasable ratchet device further includes a releasing device configured to bring the releasable ratchet device to a released state, in which axial movement between the mandrel device and the locking device is allowed in both the first direction and the second direction.
E21B 23/02 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing
The present invention relates to a well tool device (1) comprising a first subsection (10) and a second subsection (20) connected to each other. The first subsection (10) comprises a first connector (12) having an outwardly facing first connection interface (13) and the second subsection (20) comprises a second connector (22) having an inwardly facing second connection interface (23), where the second connector (22) is provided radially outside of the first connector (22). The first connection interface (13) is facing towards the second connection interface (23). The first connection interface (13) comprises a first recess (14) provided in the first connector (12). The second connection interface (23) comprises a second recess (24) provided in the second connector (22). The first and second recesses (14, 24) together are forming a bolt compartment. The well tool device (1) further comprises a locking bolt (30) provided in the bolt compartment formed by the first and second recesses (14, 24) in order to connect the first and second subsections (10) to each other. The bolt compartment formed by the first and second recesses (14, 24) has an opening (25) in the outer surface of the second connector (24).
E21B 17/046 - CouplingsJoints between rod and bit, or between rod and rod with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
F16L 25/06 - Construction or details of pipe joints not provided for in, or of interest apart from, groups comprising radial locking means
E21B 17/03 - CouplingsJoints between drilling rod or pipe and drill motor, e.g. between drilling rod and hammer
F16D 3/72 - Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members with axially-spaced attachments to the coupling parts
7.
WELL TOOL COMPRISING A FRANGIBLE WELL BARRIER, AND A METHOD FOR PROVIDING SUCH A WELL TOOL
The present invention relates to a well tool device (1), comprising a housing (10), a frangible disc (20) and a seat (13) for supporting the frangible disc (20) in relation to the housing (10). The housing (10) has an inner surface (11) defining a through bore (12). The frangible disc (20) is provided in the through bore (12) and comprises a side surface (A20). The seat (13) comprises a side surface (A13). A sealing device (30) is provided between the frangible disc (20) and the seat (13). The sealing device (30) provided between the side surface (A20) of the frangible disc (20) and the side surface (A13) of the seat (13) is made from a vulcanized rubber material.
The invention relates to a sealing device (1) for a well plug with a mandrel device (2), a sealing element (10), a first supporting device (20) provided on a first side of the sealing element (10) and a second supporting device (22) provided on a second side of the sealing element (10). Each supporting device (20, 22) comprises proximal supporting elements (30) provided proximal to the sealing element (10) and distal supporting elements (50), where first ends (31, 51) of the respective proximal and distal supporting elements (30, 50) are pivotably connected to each other. The second ends (32) of the proximal supporting elements (30) are pivotably connected to a connector (62) of a proximal supporting ring (60). The sealing device (1) is configured to be brought from a run state to a first set state by relative axial movement of the distal supporting rings (58) towards each other and relative axial movement of the proximal supporting rings (60) towards each other. The connector (62) comprises an expansion section (65) in the radial direction of the proximal supporting ring (60), where the expansion section (64) is allowing the proximal supporting element to be displaced at a radial distance (d) from the first set state to a second set state.
The present invention relates to a casing plug assembly (1) for performing an operation in a well pipe. The assembly comprises a running tool (10) for connection to a drill pipe, an equalizing module (20), a seal module (30), and an anchor module (50). A continuous fluid channel (2) is formed through the casing plug assembly (1). The anchor module (50) is configured to be set in the well pipe by pumping fluid through continuous fluid channel (2). The anchor module (50) is, in the set state, providing a support in the well pipe used by the running tool (10) to operate the seal module (30). The invention also relates to a method for operating the casing plug assembly (1) in a well pipe. The invention also relates to an anchor module (50) for anchoring to a well pipe.
E21B 23/01 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
E21B 33/128 - PackersPlugs with a member expanded radially by axial pressure
E21B 33/129 - PackersPlugs with mechanical slips for hooking into the casing
10.
WELL TOOL DEVICE COMPRISING FORCE DISTRIBUTION DEVICE
Well tool device (1), comprising a mandrel device (10), a sealing element (12) and upper and lower supporting devices (13, 14). The well tool device (1) may be configured between a run state, in which the sealing element (12) is radially retracted, and a set state, in which the sealing element (12) is radially expanded. The well tool device (1) further comprises a pressure distribution device (20) for distributing the pressure on the sealing element (12) in the set state via the upper and lower supporting devices (13, 14). The pressure distribution device (20) comprises a sleeve device (21) provided radially outside the mandrel device (10) and radially inside the sealing element, where the sleeve device (21) is axially displaceable in a sleeve compartment (40) in relation to the mandrel device (10) and the sealing element (12). The sleeve device (21) comprises an upper protrusion (22) for applying a downwardly directed axial force to the upper supporting device (14) when the sleeve device (21) is in its lower position. The sleeve device (21) comprises a lower protrusion (23) for applying an upwardly directed axial force to the lower supporting device (15) when the sleeve device (21) is in its upper position.
A well tool including a plugging device having an inner mandrel, an anchoring device and a sealing device. The tool also includes a junk catching device having an outer housing, a bore provided inside the housing and a receiving device provided in an upper end of the housing. A lower end of the outer housing is connected to an upper end of the inner mandrel of the plugging device. The receiving device comprises a receiving opening providing an opening into the bore and a junk guiding device for guiding junk into the bore via the receiving opening. The well tool further includes a valve device having a run state and a set state, where the valve device forms a termination of a junk container in the set state.
E21B 27/00 - Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sandDrill bits with means for collecting substances, e.g. valve drill bits
E21B 23/01 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
Releasable ratchet device (1), comprising a mandrel device (10) with a grooved area (11) and a locking device (20) comprising locking grooves (21) configured to be engaged with the grooved area (11) of the mandrel device (10). The releasable ratchet device (1) may be configured to be in a locked state, in which axial movement between the mandrel device (10) and the locking device (20) is allowed in a first direction (A) when the locking device (20) is engaged with the mandrel device (10) and movement between the mandrel device (10) and the locking device (20) is prevented in a second direction (B) opposite of the first direction (A) when the locking device (10) is engaged with the mandrel device (20). The releasable ratchet device (1) further comprises a releasing device (30) configured to bring the releasable ratchet device (1) to a released state, in which axial movement between the mandrel device (10) and the locking device (20) is allowed in both the first direction (A) and the second direction (B).
The present invention relates to a millable plugging device for use in a well pipe. The device includes an inner mandrel and an outer housing provided radially outside at least parts of the inner mandrel. A sealing assembly is provided radially outside the inner mandrel, where the sealing assembly is configured to be brought from a run state to a set state by a relative axial displacement between the inner mandrel and the outer housing. The millable plugging device has a first center axis and the second mandrel section has a second center axis which is displaced parallel in relation to the first center axis. Rotation of the inner mandrel in the set state is bringing a third mandrel section of the mandrel to a locked state, in which further rotation of the inner mandrel is prevented.
a) of the housing (10). The receiving device (20) comprises a receiving opening (21) providing an opening into the bore (11) and a junk guiding device (22) for guiding junk into the bore (11) via the receiving opening (21). The junk guiding device (22) is configured to be provided in a run state, in which the outer diameter of a guiding section (22A) of the junk guiding device (22) is less than or equal to the outer diameter of the housing (10), and in a set state, in which the outer diameter of the guiding section (22A) of the junk guiding device (22) is larger than the outer diameter of the housing (10).
E21B 27/00 - Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sandDrill bits with means for collecting substances, e.g. valve drill bits
E21B 31/00 - Fishing for or freeing objects in boreholes or wells
E21B 23/01 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
A plugging device for sealing against an inner surface of a pipe includes a mandrel, a sealing device, and an actuating device. The sealing device includes a first body provided circumferentially around the mandrel, an upper supporting device provided axially above the first body, and a lower supporting device provided axially below the first body. The actuating device is connected to at least one of the supporting devices for actuating the sealing device between a retracted state and an expanded state. The sealing device includes a second, sealing body provided circumferentially around the mandrel. An inner surface of the second sealing body is engaged with an outer surface of the first body in the expanded state. The second sealing body is moved from the retracted state to the expanded state by an axial displacement of at least one of the supporting devices towards each other.
Well tool (1) comprising a plugging device (20) comprising an inner mandrel (21), an anchoring device (22) and a sealing device (23). The tool also comprises a junk catching device (30) comprising an outer housing (31), a bore (32) provided inside the housing (31) and a receiving device (40) provided in an upper end (31a) of the housing (31). A lower end (31b) of the outer housing (31) is connected to an upper end (21a) of the inner mandrel (21) of the plugging device (20). The receiving device (40) comprises a receiving opening (41) providing an opening into the bore (32) and a junk guiding device (42) for guiding junk into the bore (32) via the receiving opening (41). The well tool (1) further comprises a valve device (50) having a run state and a set state, where the valve device (50) is forming a termination of a junk container (45) in the set state.
E21B 23/01 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
E21B 27/00 - Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sandDrill bits with means for collecting substances, e.g. valve drill bits
The present invention relates to a millable plugging device (1) for use in a well pipe (WP). The device comprises a inner mandrel (2) comprising a first mandrel section (2a) and a second mandrel section (2b),where the first mandrel section (2a) has a cylindrical outer surface and where the second mandrel section (2b) has a cylindrical outer surface. The device further comprises an outer housing (3) provided radially outside at least parts of the inner mandrel (2). The outer housing (3) comprises a first housing section (3a) and a second housing section (3b), where the second housing section (3b) comprises a cylindrical compartment (4b). A sealing assembly (10) is provided radially outside the inner mandrel (2), where the sealing assembly (10) is configured to be brought from a run state to a set state by a relative axial displacement between the inner mandrel (2) and the outer housing (3). The millable plugging device (1) has a first center axis (I1). The second mandrel section (2b) has a second center axis (I2b) which is displaced parallel in relation to the first center axis (I1). At least a part of the second mandrel section (2b) is provided within the compartment (4b) in the set state. Rotation of the inner mandrel (2) in the set state is bringing a third mandrel section (2c) of the mandrel (2) to a locked state, in which further rotation of the inner mandrel (2) is prevented.
The invention relates to an extrusion preventing supporting device (30) comprising interconnected chain elements (40; 50, 55). Outwardly curved ends (42; 57, 58) of the chain elements (40; 50, 55) are adapted to be received by inwardly curved ends (43; 52, 53) of adjacent chain elements (40; 50, 55). Each chain element comprises a through connection bore (44; 54, 59). The extrusion preventing supporting device (30) further comprises one continuous connection wire 70 provided through the respective connection bores (44; 54, 59).
A well pipe for inductive connection to a well tool includes a tubular pipe string and an inductive pipe element. The pipe string includes an inner pipe wall defining a longitudinal opening, where a compartment is provided radially in a radial groove of the inner pipe wall and the inductive pipe element is provided in the compartment. The well tool includes a tool body and an inductive tool element provided in a groove provided radially on the outside of the tool body. The inductive tool element is connected to the tool body by a connection device, where the inductive tool element is movable between a run state and a set state, where the inductive tool element is provided in the groove in the run state and where the inductive tool element is radially protruding from the groove in the set state.
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
The invention relates to a junk catching device (1) for catching junk traveling into a well. The device comprises an outer housing (10) comprising an upper end (10a) and a lower end (10b), a bore (11) provided inside the housing (10), a receiving device (20) provided in the upper end (10a) of the housing (10). The receiving device (20) comprises a receiving opening (21) providing an opening into the bore (11) and a junk guiding device (22) for guiding junk into the bore (11) via the receiving opening (21). The junk guiding device (22) is configured to be provided in a run state, in which the outer diameter of a guiding section (22A) of the junk guiding device (22) is less than or equal to the outer diameter of the housing (10), and in a set state, in which the outer diameter of the guiding section (22A) of the junk guiding device (22) is larger than the outer diameter of the housing (10).
E21B 23/01 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
E21B 27/00 - Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sandDrill bits with means for collecting substances, e.g. valve drill bits
The invention relates to a plugging device (1) for sealing against an inner surface of a pipe. The device is comprising a mandrel (2), a sealing device (10) and an actuating device (3). The sealing device (10) is comprising a first body (12) provided circumferentially around the mandrel (2), an upper supporting device (20) provided axially above the first body (12) and a lower supporting device (22) provided axially below the first body (12). The actuating device (3) is connected to at least one of the supporting devices (20, 22) for actuating the sealing device (10) between a retracted state and a expanded state. The sealing device (10) further comprises a second, sealing body (14)made of an elastic or ductile material and provided circumferentially around the mandrel (2). The second, sealing body (14) is provided axially adjacent to the first body (12) in the retracted state. An inner surface (14I) of the second sealing body (14) is engaged with an outer surface (12 O) of the first body (12) in the expanded state. The second sealing body (14) is moved from the retracted state to the expanded state by an axial displacement of at least one of the supporting devices (20, 22) towards each other.
a) of the first or second cone (12, 14), thereby bringing the packer device (4) between its expanded and retracted positions respectively. The front supporting elements (30) and the rear supporting elements (40) comprise front surfaces (32, 42), where the front surfaces (32, 42) are faced towards the base of the first and second cones (12, 14) and provide an extrusion barrier surface for the packer body (50) in the expanded position.
Method and use of abandoning a well (2) or removing a well element (10) which is arranged in a well (2) by melting surrounding materials or by melting the well element (10), the method comprising the steps of; providing an amount of a heat generating mixture (6), the amount (6) being adapted to perform one of the desired operations, positioning the heat generating mixture (6) at a melting position in the well (2), igniting the heat generating mixture (6), thereby melting the surrounding materials in the well (2) or melting the well element (10).
E21B 29/02 - Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windowsDeforming of pipes in boreholes or wellsReconditioning of well casings while in the ground by explosives or by thermal or chemical means
The invention relates to a well pipe (2) for inductive connection to a well tool (3) and a well tool (3) for inductive connection to a well pipe (2). The well pipe comprises a tubular pipe string (10) and an inductive pipe element. The pipe string comprises an inner pipe wall (11) defining a longitudinal opening (12), where a compartment (13) is provided radially in the inner pipe wall (11) where the inductive pipe element (20) provided in the compartment (13). The compartment (13) is provided in a radial groove (14) of the inner pipe wall (11). The well tool comprises a tool body (30), where a groove (31) is provided radially on the outside of the tool body (30) and an inductive tool element (40) provided in the groove (31) of the tool body (30). The inductive tool element (40) is connected to the tool body (30) by means of a connection device (32), where the connection device (32) is providing that the inductive tool element (40) is movable between a run state and a set state, where the inductive tool element (40) is provided in the groove (31) in the run state and where the inductive tool element (40) is radially protruding from the groove (31) in the set state.
The invention relates to an extrusion preventing supporting device (30) comprising interconnected chain elements (40; 50, 55). Outwardly curved ends (42; 57, 58) of the chain elements (40; 50, 55) are adapted to be received by inwardly curved ends (43; 52, 53) of adjacent chain elements (40; 50, 55). Each chain element comprises a through connection bore (44; 54, 59). The extrusion preventing supporting device (30) further comprises one continuous connection wire 70 provided through the respective connection bores (44; 54, 59).
The present invention relates to a plugging device (1) comprising a housing (10), a packer device (2), a first supporting assembly (3) supporting a first side (2a) of the packer device (2) in the expanded state and a second supporting assembly (4) supporting a second side (2b) of the packer device (2) in the expanded state. The packer device (2) is provided circumferentially around the housing (10); where the packer device (2) is configured to be provided in a retracted state and an expanded state, where the radial radius (R2) of the packer body (20) in the expanded state is larger than the radial radius (R1) of the packer body (20) in the retracted state. The packer device (2) comprises a packer body (20) and a supporting device (30) for supporting the packer body (20) in the expanded state. The first and second sides (2a, 2b) of the packer device (20) and/or the supporting device (30) have the same circumference (C) in the retracted state and the expanded state, where the circumference (C) is larger than the circumference(C10) of the housing (10).
The invention relates to a setting and retrieval device (1) for setting and/or retrieval of a plugging device in a well. The device comprises a first connection device (2) adapted to be connected to a first connection interface of the plugging device and a second connection device (3) adapted to be connected to a second connection interface of the plugging device. The setting and retrieval device further comprises a power supplying device comprising a fluid pump device (51) provided for pumping fluid between the first and second fluid chambers (41, 42) via a first fluid channel (11) and a second fluid channel (12). The setting and retrieval device further comprises a charging device (4) comprising a first fluid chamber (41) and a second fluid chamber (42), a displaceable charging piston (44) comprising a first end (44a) within the second fluid chamber (42) and a second end (44b) operable to energize an energy storing device (45), where the energy storing device (45) is charged with potential energy as the charging piston (44) moves in a first direction (A) when fluid is being pumped from the first chamber (41) to the second fluid chamber (42), and where a movement in a second, axial, direction (B) of the first connection device (2) relative to the second connection device (3) is achieved upon discharge of the energy stored in the energy storing device (45). The setting and retrieval device further comprises a volume adjusting device (7) comprising a first volume adjusting piston (71) is displaceable into the first fluid chamber (41).
E21B 23/04 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
The invention relates to a plugging device (1) comprising a packer device (4) for pressure tight sealing of a pipe. The packer device (4) comprises a first outer packer supporting device (20), a second outer packer supporting device (22) and an outer packer body (50) provided axially between the first packer supporting device (20) and the second packer supporting device (22). The outer packer (50) is movable between a radially retracted position and a radially expanded position by an axial movement between the first and second outer packer supporting devices (20, 22). The packer device 4 further comprises a first inner packer supporting device (12), a second inner packer supporting device (14) and an inner packer body (15) provided axially between the first inner packer supporting device (12) and the second inner packer supporting device (14). The inner packer body (15) is provided radially inside the outer packer body (50) when the outer body is in the radially expanded position. The inner packer body (15) is movable between a radially retracted position and a radially expanded position by an axial movement between the first and second inner packer supporting devices (12) and (14).
The present invention relates to a plugging device (1), comprising a packer device (4) for pressure tight sealing of a pipe. The packer device (4) comprises a cone device (10) comprising a first cone (12) and a second cone (14), each having their base faced towards each other and each comprising a tapering surface (12a, 14a). A first packer supporting device (20) is provided on a first side of the cone device (10), a second packer supporting device (22) is provided on a second side of the cone device (10) and a packer body (50) provided is between the first packer supporting device (20) and the second packer supporting device (22). The first and second packer supporting devices (20, 22) comprise supporting arms (24) having a first end (24a) movably connected to the plugging device (1) and a second end (24b) connected to either a front supporting element (30) or a rear supporting element (40). A sliding surface is provided on the first and second packer supporting device (20, 22) for sliding up and down the tapering surface (12a, 14a) of the first or second cone (12, 14), thereby bringing the packer device (4) between its expanded and retracted position respectively. The front supporting elements (30) and the rear supporting elements (40) comprise front surfaces (32, 42), where the front surfaces (32, 42) are faced towards the base of the first and second cones (12, 14) and provide an extrusion barrier surface for the packer body (50) in the expanded position.
Device for carrying a replacement safety valve in a well tube, with a straddle structure for placement inside a damaged "Down Hole Safety Valve" nipple seal area. It is comprising a pair of sealing assemblies (15, 16) to be activated upon setting of the device to seal said nipple seal area, and a locking dog assembly (17) for locking the device in the well tube, said elements being carried by a tubular mandrel (12). At least one of the sealing assemblies (15, 16) comprises a expandable element (22; 34) being activated by a pair of annular press elements (19, 20).
Device for sealing a leakage in a well tube (11), comprising a sealing ring (14) and elements (22 - 25) for forcing the sealing ring into sealing engagement with the wall (20) of the tube (11). A power device (35; 38) being operatively connected to said elements (22 - 25). The sealing ring (14) has bevelled ends (18, 19) which are juxtaposed with a pair of mating conical rings (24, 25). A cylinder-piston-device (36) is engaging the conical rings (24, 25) for forcing them into expanding engagement with the sealing ring (14).
patents
