Hydraulic slip type liner hanger

Abstract

The present invention belongs to the field of oil and gas downhole operation equipment and facilities, and proposes a hydraulic slip-type tail pipe hanger, including a lifting short pipe, a sealed center pipe, a multi-section short-connection structure, a tie-back tube, a screen cap, a pressure sleeve, an isolation sleeve, a conical pipe fitting and a lower joint. A hydraulic device is arranged on the outside of the conical pipe fitting, and a slip device is arranged on the hydraulic action end of the hydraulic device. The slip device includes a slip support sleeve, a connecting sleeve and a slip. The slip includes a wedge tile section, a tile holding section, an upper tile opening, a lower tile opening, a conical surface and a cylindrical surface. The outer wall curvature of the slip is equal to the curvature of the well wall, and all the slips are expanded to form an axially sealed isolation structure. The slip device provided by the present invention adopts a plurality of slips that can be embraced. After all the slips are hydraulically driven to complete the expansion, they can not only be stuck on the well wall to achieve hanging and positioning, but also can effectively achieve isolation, and the isolation sealing is good, which is conducive to reducing the use and investment cost of special isolation devices, and is suitable for large-scale promotion.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas downhole operation equipment and facilities, and in particular relates to a hydraulic slip type liner hanger. Background Art

[0002] The liner refers to a section of casing string that does not extend to the wellhead but is suspended on the upper casing, also known as a drilling liner. The liner hanger is an important tool in downhole operations of oil and gas. The liner hanger can be used to lower and hang the liner in sections to avoid the difficulty of lowering too long casing at one time. The liner is suspended on the upper casing string so that the liner can be stably located in the designed position in the wellbore, providing basic support for subsequent completion operations. In most cases, the liner is suspended near the bottom of the upper casing by the liner hanger, located in the middle and lower part of the wellbore. The liner is usually located above the production layer section or the formation section that needs to be sealed and protected. It is used to isolate the upper non-production layer section, provide a stable channel for fluids such as oil and gas, and prevent formation fluids from flowing into each other.

[0003] At present, the slips in the hydraulic slip-type liner hanger can not only play the role of holding the well wall, but also play a certain sealing role, such as the expandable liner hanger with slips disclosed in the existing patent CN201711030338.1, and the liner suspension packer with anti-impact function for cementing disclosed in CN202310373323.4. However, since there is a certain axial gap within the clamping range when the slips are clamped with the well wall after expansion, only simple isolation can be achieved, which will affect its sealing effect. Therefore, it is generally necessary to cooperate with a special downhole packer to improve the sealing effect. If a special packer is additionally used, the operation actions required to be completed by the top drive are more complicated. Summary of the invention

[0004] The present invention aims at the technical problems existing in the above-mentioned hydraulic slip type liner hanger and proposes a hydraulic slip type liner hanger which has a reasonable design and adopts hydraulic slips with good positioning effect and expansion and sealing effect.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is that the hydraulic slip-type tail pipe hanger provided by the present invention includes a lifting short pipe, and the lifting short pipe is provided with a sealed center pipe in the direction away from its head end, and the sealed center pipe is connected to the lifting short pipe through a multi-section short-connection structure, and a return tube is provided on the outside of the lifting short pipe, and a screen cap is provided on the end of the return tube, and a pressure sleeve, an isolation sleeve, a cone pipe fitting and a lower joint are provided in sequence at the end of the return tube away from the lifting short pipe, and a hydraulic device is provided on the outside of the cone pipe fitting, and the hydraulic device includes a hydraulic cylinder, a pressure transmission hole and a piston, and a slip device is provided at the hydraulic action end of the hydraulic device, and the slip device includes a movable nesting fitting with the hydraulic cylinder A cava support sleeve is provided, wherein a connecting sleeve is provided inside the cava support sleeve and connected thereto by multiple pairs of positioning screws, an outer wall of the connecting sleeve is provided with at least 6 inverted wedge openings distributed in a circular array, the inverted wedge openings are in an inverted isosceles trapezoidal structure, a cava is provided in the inverted wedge openings, the cava comprises a wedge tile section connected to the inverted wedge openings, a tile holding section is provided on the top of the wedge tile section and is distributed therewith in a T-shape, an upper tile opening and a lower tile opening which are staggered up and down are provided on the tile holding section, the upper tile openings and the lower tile openings of adjacent cava are movably plugged together, the inner wall of the cava is provided with a conical surface and a cylindrical surface which cooperate with the conical pipe fitting, the curvature of the outer wall of the cava is equal to the curvature of the well wall, and all the cava expand to form an axially sealed isolation structure.

[0006] Preferably, the outer wall of the slip is provided with a plurality of annular grooves spaced apart in the axial direction, and a spring washer for clamping the slip is provided in all the annular grooves at the same level.

[0007] Preferably, an inner ring groove is provided inside the lower half of the shoe-holding section, a sliding barrier bushing is provided in the inner ring groove, a plurality of spring blind holes are provided inside the sliding barrier bushing, a barrier spring contacting and cooperating with the inner ring groove is provided inside the spring blind hole, and the maximum expansion diameter of the sliding barrier bushing is smaller than the outer wall diameter of the shoe.

[0008] Preferably, the cava is connected to the connecting sleeve through a pair of axially spaced anti-slip components, the anti-slip component includes a key-type protrusion arranged on the inverted wedge, a countersunk groove is arranged inside the key-type protrusion, a countersunk protrusion is arranged at a position on the cava corresponding to the key-type protrusion, a countersunk bolt is arranged in the countersunk protrusion, and an anti-slip nut located in the countersunk groove is arranged at the end of the countersunk bolt.

[0009] Preferably, the slip support sleeve is provided with a plurality of low wall openings spaced one by one with the inverted wedge openings in the cone direction toward the cone pipe fitting, and the diameter of the low wall openings is larger than the radial movement range of the slip bottom.

[0010] Preferably, the outer wall of the cava support sleeve is provided with a conical groove, the inner wall end of the cylinder is provided with an internal toothed ring convex, a balance spring is provided in the conical groove, and the two ends of the balance spring are respectively in contact with the bottom of the conical groove and the tooth side of the internal toothed ring convex.

[0011] Preferably, an inverted nut shell is provided inside the pressure sleeve, and a sealing box and a locking block distributed front and back are provided inside the inverted nut shell, and the sealing box and the locking block are connected by a plurality of pins.

[0012] Preferably, the multi-section short-circuit structure comprises a joint, an intermediate short-circuit pipe and an inverted short-circuit pipe which are arranged in sequence, and a buckle spring and an inverted nut are arranged between the inverted short-circuit pipe and the inverted nut shell.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are:

[0014] The hydraulic slip type tail pipe hanger provided by the present invention has a hydraulic device connected to a ground pump truck through a pressure transmission hole and a pipeline, and drives the piston to move by hydraulic means, thereby driving the slip device to produce an expansion action; the slip device adopts a plurality of slips that can be surrounded, and after all the slips are hydraulically driven to complete the expansion, they can not only be stuck on the well wall to achieve sitting and positioning, but also effectively achieve isolation, and the isolation sealing performance is good, which is conducive to reducing the use and investment cost of special packers, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A cross-sectional view of a hydraulic slip type liner hanger provided in an embodiment;

[0017] Figure 2 A front view of a hydraulic slip type liner hanger provided in an embodiment;

[0018] Figure 3 An axonometric view of a hydraulic slip-type liner hanger provided for an embodiment;

[0019] Figure 4 for Figure 1 A magnified schematic diagram of the structure in the middle;

[0020] Figure 5 An axonometric view of the slip device, cone pipe, locking block and pin provided in the embodiment;

[0021] Figure 6 A top view of the slip device, cone pipe, locking block and pin provided in the embodiment;

[0022] Figure 7 A front view of the slip device provided for the embodiment in an unexpanded state;

[0023] Figure 8 A cross-sectional view of the slip device provided for the embodiment in an unexpanded state;

[0024] Fig. 9 A front view of the slip device provided in the embodiment after expansion;

[0025] Fig.10 An axonometric view of the slip device provided for the embodiment after expansion;

[0026] Fig.11 A bottom view of the slip device provided in the embodiment after expansion;

[0027] Fig.12 A combined axonometric view of the slip support sleeve and the connecting sleeve provided in the embodiment;

[0028] Fig.13 An axonometric view of a sliding barrier bushing and a barrier spring provided in an embodiment;

[0029] Fig.14 An axonometric view of the slip provided for the embodiment;

[0030] Fig.15 A top view of a conical pipe fitting, an inverted nut shell and a sealing box provided in an embodiment;

[0031] In the above figures, 1, lifting short pipe; 2, sealing center pipe; 3, return tube; 4, screen cap; 5, pressure sleeve; 6, isolation sleeve; 7, cone pipe fitting; 8, hydraulic device; 81, hydraulic cylinder; 82, pressure transmission hole; 83, piston; 84, inner gear ring convex; 9, slip device; 91, slip support sleeve; 911, low wall mouth; 912, conical groove; 92, positioning screw; 93, connecting sleeve; 94, inverted wedge mouth; 95, slip; 951, wedge tile section; 952, tile holding section; 953, upper Cushion mouth; 954, lower cushion mouth; 955, conical surface; 956, cylindrical surface; 957, annular groove; 96, spring washer; 97, sliding barrier bushing; 98, barrier spring; 10, anti-drop assembly; 101, key-type protrusion; 102, countersunk groove; 103, countersunk protrusion; 104, countersunk bolt; 105, anti-drop nut; 11, balance spring; 12, inverted nut shell; 13, sealing box; 14, locking block; 15, pin shaft; 16, joint; 17, intermediate short pipe; 18, lower joint. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the accompanying drawings themselves, and do not limit the structure.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0034] Examples, such as Figure 1-Figure 15 As shown, the hydraulic slip-type tail pipe hanger provided by the present invention comprises a lifting short pipe 1, and the lifting short pipe 1 is provided with a sealed center pipe 2 in the direction away from the head end thereof, and the sealed center pipe 2 is connected to the lifting short pipe 1 through a multi-section short-connection structure, and a return tube 3 is provided on the outside of the lifting short pipe 1, and a screen cap 4 is provided at the end of the return tube 3, and the return tube 3 is provided with a pressure sleeve 5, an isolation sleeve 6, a cone pipe 7 and a lower joint 18 in sequence at the end away from the lifting short pipe 1, and a hydraulic device 8 is provided on the outside of the cone pipe 7, and the hydraulic device 8 includes a hydraulic cylinder 81, a pressure transmission hole 82 and a piston 83, and a slip device 9 is provided at the hydraulic action end of the hydraulic device 8. Among them, the lifting short pipe 1, the sealed center pipe 2, the return tube 3, the screen cap 4, the pressure sleeve 5, the isolation sleeve 6, the cone pipe 7 and the lower joint 18 are existing mature technologies, and this embodiment will not be repeated here. The cone pipe 7 includes a pipe body on which a cone is arranged, a section of the cone facing the spacer sleeve 6 is a front cylindrical section, the diameter of which is substantially equal to the large bottom diameter of the cone, and a section of the cone facing the hydraulic device 8 is a rear cylindrical section, the diameter of which is substantially equal to the small bottom diameter of the cone. Since the slip device 9 is directly related to the expansion and sealing effect of this position, the present invention proposes beneficial improvements to the slip device 9.

[0035] In order to improve the positioning performance and expansion sealing performance of the slip device 9, the slip device 9 provided by the present invention includes a slip support sleeve 91 movably nested with the hydraulic cylinder 81, the interior of the slip support sleeve 91 is provided with a connecting sleeve 93 connected to it by multiple pairs of positioning screws 92, the outer wall of the connecting sleeve 93 is provided with at least 6 inverted wedges 94 distributed in a circular array, the inverted wedges 94 are in an inverted isosceles trapezoidal structure, and a slip 95 is provided in the inverted wedge 94, and the slip 95 includes a connecting sleeve 93 connected to the inverted wedge 94. A wedge-shaped tile segment 951 is provided on the top of the wedge-shaped tile segment 951, and an upper tile opening 953 and a lower tile opening 954 are arranged on the tile holding segment 952, which are staggered up and down. The upper tile opening 953 and the lower tile opening 954 of adjacent slips 95 are movably plugged together. The inner wall of the slip 95 is provided with a conical surface 955 and a cylindrical surface 956 that cooperate with the conical pipe fitting 7. The curvature of the outer wall of the slip 95 is equal to the curvature of the well wall. After all the slips 95 are expanded, an axially sealed isolation structure is formed. Regarding the number of cavas 95, if the number of cavas 95 is 6-10, the distribution density of the cavas 95 on the expansion sealing surface can be guaranteed, the uniformity of the cylindrical surface finally formed by the outer wall and the combined sealing of the cava section 952 can be improved, and it can be ensured that the maximum outer diameter of all cavas 95 in the contracted state does not protrude beyond the maximum outer diameter of the tail pipe hanger, and the minimum inner diameter is not less than the diameter of the rear cylindrical section of the conical pipe fitting 7.

[0036] Specifically, the hydraulic device 8 is connected to the ground pump truck through the pressure transmission hole 82 and the pipeline. The ground pump truck is used to provide hydraulic power to the hydraulic device 8. The hydraulic device 8 drives the piston 83 to realize linear reciprocating motion inside the cylinder 81 by hydraulic means, thereby driving the slip device 9 to produce expansion action. Regarding the slip device 9, the slip support sleeve 91 is in direct contact with the piston 83, and can be driven by the piston 83 to move along the pipe body of the cone pipe 7; on the other hand, the slip support sleeve 91 also provides an effective connection node for the connecting sleeve 93, and the connecting sleeve 93 is used to install all the slips 95, especially to enable the slips 95 to complete the expansion action along the cone part of the cone pipe 7. Furthermore, the slip device 9 adopts a plurality of slips 95 that can be embraced, the conical surface 955 of the slip 95 corresponds to the cone of the conical pipe fitting 7, and the cylindrical surface 956 of the slip 95 is used to be able to fit closely to the front cylindrical section of the conical pipe fitting 7 after expansion. Therefore, if the slip 95 is in the original position, the combined surface formed by the inner wall of all the slips 95 and the combined surface formed by the outer wall are not standard and complete cylindrical surfaces, and the maximum combined diameter of all the slips 95 is smaller than the maximum diameter of the conical pipe fitting 7, which does not affect the activity of the tail pipe hanger in the well; if all the slips 95 are driven by hydraulic pressure, the conical surface 955 makes a planar motion along the cone, and the planar motion includes linear movement and radial expansion displacement until The cylindrical surfaces 956 of all the slips 95 are tightly attached to the front cylindrical section of the conical pipe 7, and the outer wall curved surfaces of all the slips 95 are also on the same cylindrical surface, so that all the slips 95 can be effectively clamped and matched with the well wall, so that the tail pipe can be seated and positioned; at the same time, after the adjacent slips 95 are expanded, the upper slip openings 953 and the lower slip openings 954 are staggered and correspond to each other but not completely separated, so a certain sealing surface is maintained between the slips 95, so that all the slips 95 can establish an effective blocking barrier in the axial direction to achieve isolation, and the isolation sealing is good, which can effectively cut off the downhole fluid and prevent the mutual flow of formation fluids, which is also conducive to reducing the use and investment cost of special packers.

[0037] like Figure 7-Figure 10As shown, in order to improve the reset efficiency of all the slips 95, the outer wall of the slip 95 provided by the present invention is provided with a plurality of annular grooves 957 distributed axially at intervals, and a spring washer 96 for tightening the slip 95 is provided in all the annular grooves 957 at the same level. Among them, the spring washer 96 is provided with a break, and the length of the break is small, but it can ensure that the spring washer 96 can gradually open its own caliber during the expansion process of all the slips 95, and still remain in the corresponding annular groove 957 after the expansion of the slip 95, so as to maintain the tightening effect on the slip 95. After the piston 83 of the hydraulic device 8 is reset, the restorative trend of the spring washer 96 plus the negative pressure generated by the reset of the piston 83 can make all the slips 95 enter a contraction trend until all the slips 95 are reset, thereby improving the reset efficiency of the slip 95; on the other hand, the spring washer 96 also plays a certain sealing role, which can improve the sealing ability of the slip 95 after expansion.

[0038] like Fig.10 and Fig.12 As shown, the lower half of the shoe-holding segment 952 is provided with an inner annular groove 957, a sliding barrier bushing 97 is provided in the inner annular groove 957, a plurality of spring blind holes are provided in the sliding barrier bushing 97, a barrier spring 98 contacting and cooperating with the inner annular groove 957 is provided in the spring blind holes, and the maximum expansion diameter of the sliding barrier bushing 97 is smaller than the outer wall diameter of the slip 95. The sliding barrier bushing 97 can be driven by the barrier spring 98 to extend from the inner annular groove 957 after all shoe-holding segments 952, that is, after the outer wall of the shoe-holding segment 952 enters the same outer cylindrical surface, and the sliding barrier bushing 97 abuts against the adjacent shoe-holding segment 952, which can effectively reduce the flow of fluid rushing to the expansion sealing surface of the slip 95, reduce the probability of leakage on the expansion sealing surface of the slip 95, and thereby further improve the expansion sealing effect of the slip 95.

[0039] like Figure 8 and Fig.12As shown, in order to improve the connection reliability between the cava 95 and the connecting sleeve 93, the cava 95 provided by the present invention is connected to the connecting sleeve 93 by a pair of axially spaced anti-slip components 10, and the anti-slip component 10 includes a key-type protrusion 101 arranged on the inverted wedge 94, and the length direction of the key-type protrusion 101 is parallel to the axial direction of the connecting sleeve 93, and a countersunk groove 102 is arranged inside the key-type protrusion 101. A countersunk protrusion 103 is arranged at a position on the cava 95 corresponding to the key-type protrusion 101, and a countersunk bolt 104 is arranged in the countersunk protrusion 103. The end of the countersunk bolt 104 is provided with an anti-slip nut 105 located in the countersunk groove 102. In this way, the effective length from the head end of the countersunk bolt 104 to the anti-slip nut 105 is reflected as the maximum radial expansion distance of the cava 95, and the countersunk bolt 104 and the anti-slip nut 105 always connect the cava 95 and the connecting sleeve 93, avoiding the situation that the cava 95 cannot be reset after expansion, and the length of the countersunk groove 102 provides a certain axial buffer margin for the countersunk bolt 104, which is beneficial to improve the uniformity of force on the cava 95 during the expansion and reset process, and is beneficial to improve the smoothness of the movement of the cava 95.

[0040] like Figure 5 As shown, the slip support sleeve 91 is provided with a plurality of low wall openings 911 spaced one by one with the inverted wedge openings 94 in the cone direction toward the cone pipe 7, and the diameter of the low wall openings 911 is larger than the radial movement range of the bottom of the slip 95. The low wall openings 911 are provided on the slip support sleeve 91. On the one hand, the slip 95 can be unobstructed in the expansion direction, and on the other hand, the positioning screws 92 can construct a reasonable connection span in the axial distribution, thereby ensuring the connection reliability between the slip support sleeve 91 and the connection sleeve 93 and extending the actual service life of the positioning screws 92.

[0041] like Figure 4 and Figure 8 As shown, in order to improve the reset performance of the slip 95, the outer wall of the slip support sleeve 91 provided by the present invention is provided with a conical groove 912, the inner wall end of the liquid cylinder 81 is provided with an inner toothed ring protrusion 84, and a balance spring 11 is provided in the conical groove 912, and the two ends of the balance spring 11 are respectively in contact with the groove bottom of the conical groove 912 and the tooth side of the inner toothed ring protrusion 84. The inner toothed ring protrusion 84 on the liquid cylinder 81 can be clamped on the outside of the slip support sleeve 91 by a clamping method, as a stroke over-protection mechanism; in addition, the balance spring 11 can push the slip support sleeve 91 back to its original position after the piston 83 returns to its original position, and the piston 83 itself can generate a certain negative pressure during the reset process, and the spring washer 96 has a tightening effect on the slip 95, so it can ensure that the slip 95 has a good automatic reset performance, which is also conducive to improving the operation efficiency of the downhole tool.

[0042] like Figure 1As shown, the pressure sleeve 5 is provided with an inverted nut shell 12, and the inverted nut shell 12 is provided with a sealing box 13 and a locking block 14 distributed front and back, and the sealing box 13 and the locking block 14 are connected by a plurality of pins 15. Among them, the inverted nut shell 12 provides a certain degree of threaded connection pair, which can provide an effective assembly node for the pressure sleeve 5, the isolation sleeve 6 and the cone pipe 7; the sealing box 13 and the locking block 14 improve the sealing performance of the front section annular cavity formed by the sealing center pipe 2 and the cone pipe 7, and prevent the downhole fluid from entering the connection surface between the sealing center pipe 2 and the multi-section short-circuit structure.

[0043] like Figure 1 As shown, the multi-section short-circuit structure includes a joint 16, an intermediate short pipe 17 and an inverted short pipe (not shown in the figure) which are arranged in sequence. The inverted short pipe is nested with the inverted nut shell 12 and a certain annular gap is left between the nesting surfaces. The tail end of the annular gap is a closed end. A buckle spring and an inverted nut are arranged between the inverted short pipe and the inverted nut shell 12. The buckle spring and the inverted nut can be axially sleeved on the inverted short pipe in sequence. The head end of the buckle spring abuts against the tail end of the intermediate short pipe 17, and the tail end of the inverted nut abuts against the closed end of the annular gap. Among them, the joint 16 is used to connect the lifting short pipe 1 with the intermediate short pipe 17. The inverted short pipe can simultaneously connect the intermediate short pipe 17, the sealing center pipe 2 and the inverted nut shell 12. The buckle spring and the inverted nut ensure the pre-tightening and sealing of the inverted short pipe, the sealing center pipe 2 and the inverted nut shell 12, which is conducive to improving the connection reliability of the liner hanger in the well.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A hydraulic slip-type tail pipe hanger, comprising a lifting short pipe, wherein the lifting short pipe is provided with a sealed center pipe in a direction away from its head end, wherein the sealed center pipe is connected to the lifting short pipe through a multi-section short-connection structure, wherein a return tube is provided on the outside of the lifting short pipe, wherein a screen cap is provided on the end of the return tube, wherein a pressure sleeve, an isolation sleeve, a cone pipe fitting and a lower joint are provided in sequence on the end of the return tube away from the lifting short pipe, wherein a hydraulic device is provided on the outside of the cone pipe fitting, wherein the hydraulic device comprises a hydraulic cylinder, a pressure transmission hole and a piston, wherein a slip device is provided on the hydraulic action end of the hydraulic device, wherein the slip device is provided, wherein the hydraulic device comprises a hydraulic cylinder, a pressure transmission hole and a piston, wherein the hydraulic device comprises a hydraulic slip device, wherein the hydraulic device comprises a hydraulic cylinder, a pressure transmission hole and a piston, wherein the hydraulic action end of the hydraulic device comprises a hydraulic slip device, wherein the hydraulic device comprises a hydraulic cylinder, a pressure transmission hole and a piston, wherein the hydraulic device comprises a hydraulic cylinder, a pressure transmission hole and a piston, wherein the hydraulic action end of the hydraulic device comprises a hydraulic cylinder, a pressure transmission hole and a piston, wherein the hydraulic cylinder comprises a hydraulic cylinder, a pressure transmission hole and a piston, wherein the hydraulic action end of the hydraulic device comprises a hydraulic cylinder, ... The cava device includes a cava support sleeve which is movably nested with the hydraulic cylinder, a connecting sleeve is arranged inside the cava support sleeve which is connected to the cylinder by multiple pairs of positioning screws, the outer wall of the connecting sleeve is provided with at least 6 inverted wedge openings distributed in a circular array, the inverted wedge openings are in an inverted isosceles trapezoidal structure, a cava is arranged in the inverted wedge openings, the cava includes a wedge tile section connected to the inverted wedge openings, a tile holding section which is distributed in a T shape with the wedge tile section is arranged on the top of the wedge tile section, an upper tile opening and a lower tile opening which are staggered up and down are arranged on the tile holding section, the upper tile openings and the lower tile openings of adjacent cava are movably plugged together, the inner wall of the cava is provided with a conical surface and a cylindrical surface which cooperate with the conical pipe fitting, the curvature of the outer wall of the cava is equal to the curvature of the well wall, and all the cava form an axially sealed isolation structure after expansion.

2. The hydraulic slip type liner hanger according to claim 1, characterized in that: The outer wall of the slip is provided with a plurality of annular grooves which are distributed axially at intervals, and a spring washer for clamping the slip is provided in all the annular grooves at the same level.

3. The hydraulic slip type liner hanger according to claim 2, characterized in that: An inner ring groove is arranged inside the lower half of the shoe-holding section, a sliding barrier bushing is arranged in the inner ring groove, a plurality of spring blind holes are arranged inside the sliding barrier bushing, a barrier spring contacting and cooperating with the inner ring groove is arranged inside the spring blind hole, and the maximum expansion diameter of the sliding barrier bushing is smaller than the outer wall diameter of the shoe.

4. The hydraulic slip type liner hanger according to any one of claims 1 to 3, characterized in that: The cava is connected to the connecting sleeve by a pair of axially spaced anti-slip components, the anti-slip component includes a key-type protrusion arranged on the inverted wedge, a countersunk groove is arranged inside the key-type protrusion, a countersunk protrusion is arranged at a position on the cava corresponding to the key-type protrusion, a countersunk bolt is arranged in the countersunk protrusion, and an anti-slip nut located in the countersunk groove is arranged at the end of the countersunk bolt.

5. The hydraulic slip type liner hanger according to claim 1, characterized in that: The slip support sleeve is provided with a plurality of low wall openings spaced one by one with the inverted wedge openings in the cone direction facing the cone pipe fitting, and the diameter of the low wall openings is larger than the radial movement range of the slip bottom.

6. The hydraulic slip type liner hanger according to claim 1, characterized in that: The outer wall of the cava support sleeve is provided with a conical groove, the inner wall end of the cylinder is provided with an inner tooth ring convex, a balance spring is provided in the conical groove, and the two ends of the balance spring are respectively in contact with the groove bottom of the conical groove and the tooth side of the inner tooth ring convex.

7. The hydraulic slip type liner hanger according to claim 1, characterized in that: An inverted nut shell is arranged inside the pressure sleeve, and a sealing box and a locking block distributed front and back are arranged inside the inverted nut shell. The sealing box and the locking block are connected through a plurality of pins.

8. The hydraulic slip type liner hanger according to claim 7, characterized in that: The multi-section short-circuit structure comprises a joint, an intermediate short-circuit pipe and an inverted short-circuit pipe which are arranged in sequence, and a buckle spring and an inverted nut are arranged between the inverted short-circuit pipe and the inverted nut shell.

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