CN114482907B

CN114482907B - Oil well operation tool

Info

Publication number: CN114482907B
Application number: CN202210086187.6A
Authority: CN
Inventors: 周欢; 李英松; 董严冰; 李越; 陆仁德; 陈磊; 时营磊; 仲兆宇; 徐凤祥; 付强; 唐文波; 吴少路
Original assignee: Dripro Co ltd; China Oilfield Services Ltd
Current assignee: Dripro Co ltd; China Oilfield Services Ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2024-06-25
Anticipated expiration: 2042-01-25
Also published as: CN114482907A

Abstract

The invention belongs to the technical field of oil well operation, and relates to an oil well operation tool. The oil well operation tool comprises a central pipe, wherein a first pressure transmission hole penetrating through the central pipe along the wall thickness direction is formed in the lower part of the central pipe; the lower cone is provided with a lower conical surface with a small upper part and a large lower part; and the deblocking sleeve is sleeved on the outer peripheral surface of the central tube in a sliding manner, the top of the deblocking sleeve is fixedly connected with the lower cone, and the lower part of the deblocking sleeve is hermetically connected with the central tube above and below the first pressure transmission hole to form a deblocking hydraulic cavity. The oil well operation tool can improve the inner diameter of the central pipe in the packer deblocking mechanism.

Description

Oil well operation tool

Technical Field

The invention belongs to the technical field of oil well operation, and particularly relates to an oil well operation tool.

Background

Loose sandstone oil and gas reservoirs are widely distributed worldwide, and sand is easy to be produced in the production process because of shallow burial and loose cementation of the oil reservoirs. For oil recovery wells or water injection wells, layered sand control is the primary completion mode, and top packers are core tools in layered sand control completion strings, and are usually used in combination with setting tools, and the top packers can be removed from the wellbore by retrieving tools when necessary.

In the prior art, the current packer suitable for 7 inch 23-29lb/ft lbs casing layered sand control has smaller drift diameter, usually 3.25 ' or 3.88 ' and maximum 4', thus causing two problems, namely, limiting the outer diameter of a water injection or oil extraction pipe column tool, limiting the selection of water injection or oil extraction process and contradicting the water injection or oil extraction process; secondly, due to the limitation of the drift diameter size after sand prevention, a fishing tool for fishing a central pipe column is limited, the fishing efficiency is low, complex situations are easy to occur, the well repairing period is long, the cost is high, and the injection allocation task is delayed.

Chinese patent CN209761371U (publication date 2019, 12, 10) discloses a bearing assembly for a pipe column and a pipe column, wherein the deblocking mechanism of the packer comprises a mandrel, an outer cylinder, a switch sleeve, a bearing ring and deblocking pins, and comprises four layers from the radial structure, which occupies a larger radial space; the releasing mechanism comprises a setting mandrel, a threaded locking piece, a locking piece supporting sleeve, a locking piece reed and a positioning nipple, wherein the space between the lower part of the locking piece supporting sleeve and the positioning nipple is smaller and is directly communicated with the external space of the packer, and when sand grains enter the space, the locking piece supporting sleeve is easily blocked from moving downwards, so that releasing is difficult; the torque transmission way is that the torque is sequentially transmitted to the release pawl, the shearing pawl and the upper short joint through the setting mandrel, and the torque transmission way relates to more parts and has a complex structure.

Disclosure of Invention

In order to increase the inner diameter of a central tube in a packer deblocking mechanism, the invention provides an oil well operation tool.

The invention provides

An oil well work tool comprising:

The lower part of the central tube is provided with a first pressure transmission hole penetrating through the central tube along the wall thickness direction;

The lower cone is provided with a lower conical surface with a small upper part and a large lower part; and

The sealing sleeve is sleeved on the outer peripheral surface of the central tube in a sliding manner, the top of the sealing sleeve is fixedly connected with the lower cone, and the lower part of the sealing sleeve is in sealing connection with the central tube above and below the first pressure transmission hole to form a sealing hydraulic cavity.

The pressure transmission holes are formed in the central tube so as to fill water into the space between the sealing cover and the central tube to improve pressure, the sealing cover can be pushed to move downwards, and the lower cone fixedly connected with the sealing cover is driven to move downwards, so that sealing is realized, and the thickness of the sealing mechanism of the packer can be reduced. Correspondingly, the space in the central tube can be enlarged so as to reserve a larger bore hole inner diameter, and a water injection or oil extraction pipe column with a larger size can be put in, so that the requirements of the subsequent layered oil extraction and layered water injection processes are better met, and the difficulty of fishing the central pipe column is avoided.

In the preferred technical scheme, the center tube is fixedly connected with a lower cone limiting assembly, and the lower cone limiting assembly is located above the first pressure transmission hole and below the lower cone.

In a preferred technical scheme, the lower cone limiting assembly comprises a stop piston fixedly connected with the central tube, the inner circumferential surface of the stop piston is sealed with the central tube, and the outer circumferential surface of the stop piston is sealed with the unsealing sleeve.

In the preferred technical scheme, the inner peripheral surface of lower cone is equipped with first annular inner groove, install the shear ring in the first annular inner groove, the shear ring is still installed in the shear ring groove, the shear ring groove sets up the outer peripheral surface of center tube.

In the preferred technical scheme, the lower cone is further provided with a sector slot penetrating the lower cone along the wall thickness direction, the inner end of the sector slot is connected with the first annular inner groove, the shearing ring is composed of a plurality of sector ring monomers, and the sector slot is used for enabling the sector ring monomers to pass through the sector slot from the outer side of the lower cone and enter between the first annular inner groove and the shearing ring groove.

In the preferred technical scheme, the oil well operation tool further comprises a releasing mechanism and locking claws, wherein a plurality of first axial grooves penetrating in the wall thickness direction of the locking claws are formed in the lower portions of the locking claws, the first axial grooves extend in the axial direction of the locking claws and are distributed in the circumferential direction of the locking claws, the releasing mechanism comprises a releasing piston, a supporting ring is sleeved on the outer circumferential surface of the releasing piston, and the supporting ring is used for supporting the lower portions of the locking claws.

In the preferred technical scheme, the releasing mechanism further comprises a retaining lock ring, the retaining lock ring is embedded into a retaining lock ring groove on the outer circumferential surface of the releasing piston, the outer circumferential surface of the retaining lock ring is radially compressed by the inner circumferential surface of the middle part of the locking claw, and the first inner diameter of the inner circumferential surface of the lower part of the locking claw is larger than the second inner diameter of the inner circumferential surface of the middle part of the locking claw.

In the preferred technical scheme, the release piston is connected with the locking claw through a first shear screw.

In the preferred technical scheme, still include the movable connecting rod, the internal surface of giving up the piston with movable connecting rod sliding connection and sealing connection, the surface of giving up the piston with locking dog sealing connection, locking dog with movable connecting rod sealing connection, the movable connecting rod is equipped with the edge the second that runs through in the wall thickness direction of movable connecting rod passes the pressure hole, the second passes the pressure hole intercommunication movable connecting rod the giving up the piston with give up between the locking dog and the hydraulic chamber of giving up, and the inside of movable connecting rod.

In the preferred technical scheme, the lower part of the locking claw is provided with a releasing external thread and is connected with a releasing internal thread at the top of the central tube, and the releasing internal thread and the releasing external thread are configured to allow the locking claw to move upwards relative to the central tube when the supporting ring is separated from the lower part of the inner surface of the locking claw.

Drawings

FIG. 1A is a schematic diagram of an upper cross-sectional structure of an oil well tool according to an embodiment of the present invention;

FIG. 1B is a schematic cross-sectional view of the well tool;

FIG. 1C is a schematic view of the lower cross-sectional structure of the oil well tool;

FIG. 2 is a schematic cross-sectional view of the connecting rod in the oil well tool;

FIG. 3 is a schematic perspective view of an elastic sleeve in the oil well working tool;

FIG. 4 is a schematic cross-sectional view of a lock block in the oil well tool;

FIG. 5 is a schematic cross-sectional view of a base pipe of the well tool;

FIG. 6A is a schematic cross-sectional view of the lower cone of the well tool described above;

FIG. 6B is a cross-sectional view A-A of FIG. 6A;

FIG. 7 is a schematic perspective view of a single sector ring of a shear ring in the oil well tool;

FIG. 8A is a schematic perspective view of the locking claw in the oil well tool;

FIG. 8B is a schematic cross-sectional view of the locking pawl in the well tool;

FIG. 9 is a schematic cross-sectional view of the movable connecting rod in the oil well tool;

FIG. 10 is a schematic cross-sectional view of a release piston in the well tool described above;

fig. 11 is a schematic perspective view of the check ring in the oil well tool.

The meaning of the individual reference numerals in the figures is:

1. An upper joint; 2. a piston outer cylinder; 3. a sixth seal ring; 4. a seventh seal ring; 5. an eighth seal ring; 6. a piston; 7. a connecting rod; 8. a force transmission sleeve; 9. starting to shear the pin; 10. an elastic sleeve; 11. a pin shaft; 12 springs; 13. a locking piece; 14. a third set screw; 15. a locking claw; 16. a sixteenth seal ring; 17. a movable connecting rod; 18. a fifth seal ring; 19. a fourth seal ring; 20. a backstop lock ring; 21. a first shear screw; 22. releasing the piston; 23. hollow steel balls; 24. a support ring; 25. a second set screw; 26. a fixing ring; 27. a connector; 28. a ninth seal ring; 29. a tenth seal ring; 30. a skeletal seal ring; 31. an eleventh seal ring; 32. a locking cap; 33. a loose joint; 34. a connecting cylinder; 35. a fifteenth seal ring; 36. a steel ball; 37. a twelfth seal ring; 38. a thirteenth seal ring; 39. a second shear screw; 40. a ball seat; 41. a ball seat cover; 42. a baffle; 43. a fourteenth seal ring; 44. a second lower joint; 45. a double male oil pipe;

51. Connecting sleeves; 52. a compression ring; 52-1, water holes; 53. anti-rotation pins; 54. a central tube; 55. initiating a shear screw; 56. a locking ring; 57. a sheath; 58. rubber sleeve guide shoes; 59. a spacer ring; 60. an inner rubber cylinder; 61. an outer rubber cylinder; 62. a limiting ring; 63. a second snap ring; 64. an upper cone; 65. a first shear pin; 66. a second shear pin; 67. a slip; 68. a guide ring; 69. a fourth set screw; 70. a lower cone; 71. a shear ring; 72. deblocking the screw; 73. deblocking the envelope; 74. a first snap ring; 75. a second seal ring; 76. a third seal ring; 77. a stop piston; 78. a first seal ring; 79. a first set screw; 80. a first lower joint;

7-1, a third pressure transmission hole; 7-2, a torque transmission groove wall;

10-1, a third axial groove; 10-2, torque transmission flange walls; 10-3, pin shaft holes; 10-4, a locking piece groove;

13-1, a torque transmission protruding wall;

54-1, anti-rotation grooves; 54-2, releasing the internal thread; 54-3, locking threads; 54-4, a second snap ring groove; 54-5, shearing ring grooves; 54-6, a first annular outer groove; 54-7, a first snap ring groove; 54-8, a first pressure transmission hole;

70-1, a fan-shaped slotted hole; 70-2, a first annular inner groove; 70-3, a second axial groove; 70-4, lower cone inner steps;

15-1, oblique steps; 15-2, a first axial slot; 15-3, releasing the external thread; 15-4, a water channel; 15-5, a first straight step; 15-6, an outer hole of the first shear screw; 15-7, a support ring inner flange;

17-1, a second straight step; 17-2, a second pressure transmission hole; 17-3, a conical hole section;

20-1, a backstop lock ring groove; 20-2, a first shear screw bore.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings for a better understanding of the objects, structures and functions of the present invention.

FIG. 1C is a schematic view of the lower cross-sectional structure of the oil well tool; fig. 5 is a schematic cross-sectional view of the base pipe in the oil well tool. As shown in fig. 1C and 5, the oil well working tool provided in this embodiment includes: the central tube 54, the lower part of the central tube 54 is provided with a first pressure transmission hole 54-8 penetrating the central tube 54 along the wall thickness direction; a lower cone 70, wherein the lower cone 70 is provided with a lower conical surface with a smaller upper part and a larger lower part; and a deblocking sleeve 73 slidably sleeved on the outer circumferential surface of the central tube 54, the top of the deblocking sleeve 73 being fixedly connected with the lower cone 70, the lower part of the deblocking sleeve 73 being sealingly connected with the central tube 54 above and below the first pressure transfer hole 54-8 to form a deblocking hydraulic chamber.

Specifically, in the present embodiment, the bottom of the unsealing sleeve 73 is sealed to the outer peripheral surface of the center tube 54 by the first seal ring 78 to seal the unsealing sleeve 73 to the center tube 54 below the first pressure transmitting hole 54-8. And above the first pressure transmitting hole 54-8, sealing with the outer peripheral surface of the central tube 54 is achieved through a lower cone limit assembly, which will be described later.

The deblocking cover 73 may be fixed to the lower cone 70 by a deblocking screw 72, and specifically, a threaded hole penetrating in the wall thickness direction may be provided in the deblocking cover 73, and the deblocking screw 72 is screwed into the threaded hole. And a counter bore is provided in the middle of the outer peripheral surface of the lower cone 70, into which the deblocking screw 72 is inserted and matched with the counter bore.

By providing a pressure transfer port in the center tube 54 to increase the pressure by injecting water into the space between the deblock sleeve 73 and the center tube 54, the deblock sleeve 73 can be pushed to move downward and the lower cone 70 fixedly connected thereto can be driven to move downward, thereby realizing the deblock and reducing the thickness of the packer deblock mechanism. Accordingly, the space in the central tube 54 can be enlarged so as to reserve a larger bore hole inner diameter, and a water injection or oil extraction pipe column with a larger size can be put in, so that the requirements of the subsequent layered oil extraction and layered water injection processes can be better met, and the difficulty in salvaging the central tube 54 column is avoided.

As shown in FIG. 1C, the center tube 54 is preferably fixedly connected with a lower cone spacing assembly that is positioned above the first pressure transfer orifice 54-8 and below the lower cone 70.

Specifically, in the present embodiment, the outer peripheral surface of the lower end of the center tube 54 is provided with external threads, and the lower end of the center tube 54 is connected to the first lower joint 80 through the external threads. The top end of the first lower joint 80 is further provided with a first set screw 79, the first set screw 79 penetrates through the first lower joint 80 along the radial direction of the first lower joint 80 and is in threaded connection with the first lower joint 80, and the inner end of the first set screw 79 abuts against the part, above the external thread, of the lower peripheral surface of the central tube 54, so that the first lower joint 80 and the central tube 54 are prevented from rotating relatively.

By fixedly attaching the lower stop assembly to the center tube 54, the lower cone 70 is prevented from moving too low relative to the center tube 54, causing the lower cone 70 to collide with the first lower joint 80, damaging the lower cone 70 or the first lower joint 80.

As shown in FIG. 1C, the lower cone stop assembly preferably includes a stop piston 77 fixedly coupled to the center tube 54, the inner circumferential surface of the stop piston 77 being sealed to the center tube 54, and the outer circumferential surface of the stop piston 77 being sealed to the unsealing envelope 73.

Specifically, the central tube 54 is provided with two first snap ring grooves 54-7, and each first snap ring groove 54-7 is respectively embedded with a first snap ring 74. The outer diameter of the first snap ring 74 is greater than the portion of the center tube 54 adjacent the first snap ring groove 54-7 and is greater than the inner diameter of the stopper piston 77. The two first snap rings 74 abut against the upper end face and the lower cross section of the stop piston 77, respectively, so that a fixed connection of the stop piston 77 relative to the central tube 54 is achieved.

Wherein, the second sealing ring 75 is fixedly arranged on the outer circumferential surface of the stop piston 77 to realize the sliding sealing between the outer circumferential surface of the stop piston 77 and the unsealing sleeve 73; a third seal ring 76 is fixedly installed on the inner circumferential surface of the stopper piston 77 to achieve sealing of the inner circumferential surface of the stopper piston 77 with the center tube 54. In addition, a first annular outer groove 54-6 is provided at the outer circumferential surface of the lower portion of the center tube 54, and a lower cone inner step 70-4 protruding inward and a second axial groove 70-3 extending in the axial direction and penetrating in the wall thickness direction are further provided at the bottom of the lower cone 70, and the lower portion of the lower cone 70 is inwardly contracted due to the provision of the second axial groove 70-3 and the provision of the first annular outer groove 54-6 on the center tube 54 during the placement of the lower portion of the lower cone 70 into the upper portion of the envelope 73, thereby improving the convenience of installation.

The sealing of the unsealing sleeve 73 and the central tube 54 above the first pressure transmission hole 54-8 is arranged on the stop piston 77, so that the volume of the unsealing hydraulic cavity before the unsealing operation starts can be reduced, and the unsealing sleeve 73 can be pushed to move downwards without inputting excessive liquid into the unsealing hydraulic cavity through the first pressure transmission hole 54-8, thereby improving the action efficiency and reducing the operation time.

FIG. 6A is a schematic cross-sectional view of the lower cone of the well tool described above; as shown in fig. 1C and 6A, preferably, the inner circumferential surface of the lower cone 70 is provided with a first annular inner groove 70-2, a shear ring 71 is installed in the first annular inner groove 70-2, the shear ring 71 is also installed in the shear ring groove 54-5, and the shear ring groove 54-5 is provided on the outer circumferential surface of the center tube 54.

By providing the shear ring groove 54-5 and the first annular inner groove 70-2 to cooperatively receive the shear ring 71, the lower cone 70 and the upper cone 64 can be held together to squeeze the slips 67 when it is desired to maintain a set condition, such that the slips 67 are expanded radially outwardly to maintain the relative fixation of the lower cone 70 and the base pipe 54, providing an upward force to the lower cone 70. When the deblocking begins, the liquid is filled in the deblocking hydraulic cavity, the downward pressure applied to the deblocking sleeve 73 increases, and then the deblocking sleeve 73 can drive the lower cone 70 to shear the shear ring 71, so that the lower cone 70 and the upper cone 64 can not jointly squeeze and expand the slips 67 outwards, thereby realizing deblocking.

FIG. 6B is a cross-sectional view A-A of FIG. 6A; FIG. 7 is a schematic perspective view of a single sector ring of a shear ring in the oil well tool; as shown in fig. 6A, 6B and 7, the lower cone 70 is preferably further provided with a fan-shaped slot 70-1 penetrating the lower cone 70 in the wall thickness direction, the inner end of the fan-shaped slot 70-1 is connected with the first annular inner groove 70-2, the shear ring 71 is composed of a plurality of fan-ring units, and the fan-shaped slot 70-1 is used for allowing the fan-ring units to pass from the outer side of the lower cone 70 through the fan-shaped slot 70-1 and enter between the first annular inner groove 70-2 and the shear ring groove 54-5.

By providing the shear ring 71 to be composed of a plurality of fan ring monomers, and providing the lower cone 70 with the fan-shaped slot 70-1 penetrating in the wall thickness direction, after the lower cone 70 is sleeved on the central tube 54, and the first annular inner groove 70-2 is aligned with the shear ring groove 54-5, a single fan ring monomer is put into the fan-shaped slot 70-1, and then the put fan ring monomer is moved along the shear ring groove 54-5 along the circumferential direction of the central tube 54, so that the space on the shear ring groove 54-5 is reserved, and the subsequent fan ring monomer can enter. After the last fan ring unit is put in, the central tube 54 and the lower cone 70 are relatively rotated, so that the last two fan ring units are locally corresponding to the fan-shaped slotted holes 70-1, and all the fan ring units cannot leak out from the fan-shaped slotted holes 70-1. In this embodiment, the shear ring 71 may be composed of at least eight fanning ring monomers.

With the above-described configuration, it is possible to avoid the need for fixing the shear ring 71 by additional members to reduce the diameter of the outer peripheral surface of the center tube 54 above or below the shear ring groove 54-5 for mounting the shear ring 71, or to avoid the need for fixing the shear ring 71 to the lower cone 70 by additional members to fix the shear ring 71 to the lower cone 70 by increasing the diameter of the inner peripheral surface of the lower cone 70 above or below the first annular inner groove 70-2 for mounting the shear ring 71.

FIG. 1B is a schematic cross-sectional view of the well tool; FIG. 8A is a schematic perspective view of the locking claw in the oil well tool; FIG. 8B is a schematic cross-sectional view of the locking pawl in the well tool; as shown in fig. 1B, 8A and 8B, the oil well working tool preferably further comprises a releasing mechanism and a locking claw 15, wherein a plurality of first axial grooves 15-2 penetrating in the wall thickness direction of the locking claw 15 are formed in the lower portion of the locking claw 15, and the first axial grooves 15-2 extend along the axial direction of the locking claw 15 and are distributed along the circumferential direction of the locking claw 15; the releasing mechanism comprises a releasing piston 22, a supporting ring 24 is sleeved on the outer circumferential surface of the releasing piston 22, and the supporting ring 24 is used for supporting the lower part of the locking claw 15.

Wherein the bottom of the release piston 22 is fixedly connected with the fixing ring 26 by the second set screw 21, the fixing ring 26 is positioned below the support ring 24, and the upper side of the support ring 24 is positioned by the pillow block of the release piston 22, thereby completing the axial positioning of the support ring 24 relative to the release piston 22, so that the support ring 24 can axially move together with the release piston 22. Because the space below the locking claw 15, the release piston 22 and the fixing ring 26 is large and is located inside the central tube 54, the space is not directly communicated with the outside of the working tool, and therefore the space is not easy to be blocked by sand grains.

As shown in fig. 1B and 8A and 8B, specifically, the bottom of the inner surface of the locking claw 15 is provided with a support ring inner flange 15-7 of the locking claw 15, the diameter of the support ring inner flange 15-7 may be smaller than the diameter of the rest of the lower portion of the inner surface of the locking claw 15, and the support ring inner flange 15-7 is matched with the support ring 24 to support the lower portion of the locking claw 15 with a larger outer diameter.

By providing the first axial groove 15-2 at the lower part of the locking claw 15, the lower part of the locking claw 15 can be expanded and contracted in radial dimension, the support ring 24 is sleeved on the releasing piston 22, when the support ring 24 is positioned in the locking claw 15, the lower part of the locking claw 15 is supported by the support ring 24, and when the support ring 24 is separated from the locking claw 15, the lower part of the locking claw 15 can be contracted to complete releasing operation.

As shown in fig. 8A and 8B, in addition, a first annular outer flange is further provided at the middle of the outer surface of the locking claw 15, and the lower end surface of the first annular outer flange is provided with an inclined step 15-1, which is matched with the upper end surface of the central tube 54. The first annular outer flange is further provided with a water passage groove 15-4 penetrating the first annular outer flange in the axial direction of the locking claw 15 to supply water into the center tube 54.

FIG. 10 is a schematic cross-sectional view of a release piston in the well tool described above; FIG. 11 is a schematic perspective view of a check ring in the oil well tool; as shown in fig. 1B, 10 and 11, the releasing mechanism preferably further includes a check ring 20, the check ring 20 is fitted into a check ring groove 20-1 of the outer peripheral surface of the releasing piston 22, and the outer peripheral surface of the check ring 20 is compressed in the radial direction by the inner peripheral surface of the middle portion of the locking claw 15, and the first inner diameter of the inner peripheral surface of the lower portion of the locking claw 15 is larger than the second inner diameter of the inner peripheral surface of the middle portion of the locking claw 15.

Wherein, as shown in fig. 11, the check ring 20 may be a C-shaped ring. By providing the check ring 20 embedded in the check ring groove 20-1, the check ring 20 is compressed when the check ring 20 is in the through hole in the middle of the lock claw 15. When the check ring 20 moves downward together with the release piston 22 from the middle portion of the lock claw 15 to the lower portion of the lock claw 15, the check ring 20 is no longer restrained by the inner peripheral surface of the middle portion of the lock claw 15, expands outward, and has an outer diameter larger than the outer diameter of the release piston 22 and larger than the second inner diameter. The check ring 20 abuts against the lower end surface of the middle part of the locking claw 15, so that the check ring 20 can be prevented from entering the middle part of the locking claw 15 again, and further, the support ring 24 moving together with the release piston 22 can be prevented from entering the lower part of the locking claw 15 to support the bottom of the locking claw 15, the lower part of the locking claw 15 can be kept in a state in which the diameter can be reduced, and the lower part of the locking claw 15 can be separated from the central tube 54.

As shown in fig. 1B, preferably, the release piston 22 is connected to the locking pawl 15 by a first shear screw 21.

As shown in fig. 8B and 10, specifically, the first shear screw 21 is disposed in the first shear screw inner hole 20-2 of the release piston 22 below the check ring groove 20-1, and the first shear screw 21 passes through the first shear screw outer hole 15-6 in the middle of the lock claw 15. One of the first shear screw inner hole 20-2 and the first shear screw outer hole 15-6 may be a threaded hole, and the other may be a unthreaded hole. Of course, if the release piston 22 and the locking pawl 15 are mounted in place, then they are continuously machined with a threaded bore that includes both the first shear screw inner bore 20-2 and the first shear screw outer bore 15-6, as is also possible.

By providing the first shear screw 21 to connect the release piston 22 and the locking pawl 15, a relatively fixed connection of the release piston 22 and the locking pawl can be maintained when the release piston is subjected to a small axial force; while the release piston 22 is subjected to a large axial force, the first shear screw 21 may be sheared, thereby allowing relative movement of the release piston 22 and the locking pawl 15.

FIG. 9 is a schematic cross-sectional view of the movable connecting rod in the oil well tool; as shown in fig. 9, the hydraulic release device preferably further comprises a movable connecting rod 17, wherein the inner surface of the release piston 22 is in sliding connection and sealing connection with the movable connecting rod 17, the outer surface of the release piston 22 is in sealing connection with the locking claw 15, the locking claw 15 is in sealing connection with the movable connecting rod 17, the movable connecting rod 17 is provided with a second pressure transmission hole 17-2 penetrating along the wall thickness direction of the movable connecting rod 17, and the second pressure transmission hole 17-2 is communicated with a release hydraulic cavity among the movable connecting rod 17, the release piston 22 and the locking claw 15, and the inside of the movable connecting rod 17.

As shown in fig. 1B, specifically, a fourth sealing ring 19 is disposed on the top of the inner surface of the releasing piston 22 and is in sealing connection with the movable connecting rod 17, and since there is no direct fixing manner between the releasing piston 22 and the movable connecting rod 17, the releasing piston 22 and the movable connecting rod 17 are in sliding connection. And a fifth sealing ring 18 is arranged at the upper part of the outer surface of the releasing piston 22 and is connected with the middle part of the inner surface of the locking claw 15 in a sealing way. The sixteenth sealing ring 16 is arranged on the upper part of the inner surface of the locking claw 15 and is connected with the upper part of the outer surface of the movable connecting rod 17 in a sealing way.

FIG. 2 is a schematic cross-sectional view of the connecting rod in the oil well tool; as shown in fig. 1B and 2, furthermore, the upper portion of the lock claw 15 is fixedly connected to the lower outer peripheral surface of the connecting rod 7 by a third set screw 14, and the lower end surface of the connecting rod 7 abuts against the upper end surface of the movable connecting rod 17. Moreover, a first annular inner flange protruding inwards is arranged in the middle of the inner peripheral surface of the locking claw 15, a first straight step 15-5 on the upper surface of the first annular flange is matched with a second straight step 17-1 of a second annular outer flange arranged on the top of the movable connecting rod 17, and the upper part of the locking claw 15 is fixedly connected with the lower part of the connecting rod 7 by the aid of a third set screw 14. Therefore, the locking claw 15 is fixedly connected with the movable connecting rod 17.

Thus, the seals formed by the third seal ring 76, the fifth seal ring 18 and the fourth seal ring 19 respectively form a releasing hydraulic cavity among the movable connecting rod 17, the releasing piston 22 and the locking claw 15, so that the liquid flowing into the releasing hydraulic cavity through the second pressure transmission hole 17-2 can form downward hydraulic pressure on the top end face of the releasing piston 22. When the hydraulic force is sufficiently large, the force provided by the first shear screw 21 does not balance the hydraulic force, and the first shear screw 21 is sheared. Thus, the release piston 22 is able to move downward relative to the locking claw 15 and the movable connecting rod 17 so that the support ring 24 no longer supports the lower portion of the locking claw 15, but the check ring 20 can also withdraw from the middle portion of the locking claw 15, enter the lower portion of the locking claw 15 and expand, preventing the check ring 20 from entering the middle portion of the locking claw 15 again, avoiding the support ring 24 from supporting the lower portion of the locking claw 15 again, and affecting the disengagement of the locking claw 15 from the central tube 54.

As shown in fig. 1B and 8A, 8B, the lower portion of the locking claw 15 is preferably provided with a release external thread 15-3 and is connected with a release internal thread 54-2 on top of the center tube 54, the release internal thread 54-2 and the release external thread 15-3 being configured to allow the locking claw 15 to move upward relative to the center tube 54 when the support ring 24 is disengaged from the lower portion of the inner surface of the locking claw 15.

Specifically, in this embodiment, the external release thread 15-3 and the internal release thread 54-2 are left-handed threads. When the support ring 24 no longer supports the lower portion of the inner surface of the locking claw 15, the diameter of the release external thread 15-3 of the lower portion of the locking claw 15 can be reduced and the force with the release internal thread 54-2 weakened. When the locking claw 15 is lifted upwards, it no longer moves the central tube 54 upwards.

By providing the release external thread 15-3 and the release internal thread 54-2, when the first shear screw 21 cannot be sheared by the release piston 22, the outer diameter of the lower portion of the locking claw 15 can be reduced to separate the locking claw 15 from the central tube 54, a tool is additionally put into the device to drive the locking claw 15 to rotate, so that the locking claw 15 and the central tube 54 are separated.

As shown in fig. 9, in addition, a tapered hole section 17-3 with a large upper part and a small lower part is formed in the middle part of the inner surface of the movable connecting rod 17, and the tapered hole section 17-3 can be put into a hollow steel ball 23 to realize reseating after the later-described ball-casting setting failure.

FIG. 1A is a schematic diagram of an upper cross-sectional structure of an oil well tool according to an embodiment of the present invention; as shown in fig. 1A, the oil well working tool further comprises an upper joint 1, wherein the lower part of the inner surface of the upper joint 1 is in threaded connection with the top of the connecting rod 7 through internal threads, and the lower part of the outer surface of the upper joint 1 is in threaded connection with the piston outer cylinder 2 through external threads. The lower part of the inner surface of the upper joint 1 is provided with a sixth sealing ring 3 for sealing with the top of the connecting rod 7, wherein the sixth sealing ring 3 is positioned below the internal thread of the lower part of the inner surface of the upper joint 1. The lower part of the outer surface of the upper joint 1 is provided with a seventh sealing ring 4 for sealing with the piston outer cylinder 2, wherein the seventh sealing ring 4 is positioned below the external thread of the lower part of the outer surface of the upper joint 1.

A piston 6 is arranged between the piston outer cylinder 2 and the upper part of the upper joint 1, and the piston 6 is connected with the piston outer cylinder and the upper joint in a sliding way. The outer surface and the inner surface of the piston 6 are respectively in sliding sealing with the inner surface of the piston outer cylinder 2 and the outer surface of the connecting rod 7 through an eighth sealing ring 5. And a third pressure transmission hole 7-1 penetrating through the wall thickness direction of the connecting rod 7 is arranged on the connecting rod 7 at a position between the eighth sealing ring 5 and the sixth sealing ring 3, and the third pressure transmission hole 7-1 is opposite to the lower surface of the upper joint 1. When the liquid in the connecting rod 7 flows between the upper joint 1 and the piston 6 through the third pressure transmitting hole 7-1, a downward force can be applied to the piston 6 to push the piston 6 to move downward.

A force transmission sleeve 8 is sleeved at the middle part of the connecting rod 7, and the force transmission sleeve 8 is fixed with the connecting rod 7 through an initial shearing pin 9. The top of the force transmission sleeve 8 is abutted with the bottom of the piston 6, when the piston 6 receives downward hydraulic force, the pressure is transmitted to the force transmission sleeve 8, and when the initial shear pin 9 cannot bear the downward acting force exerted by the force transmission sleeve 8 by the piston 6, the initial shear pin 9 is sheared, and the force transmission sleeve 8 moves downwards.

FIG. 3 is a schematic perspective view of an elastic sleeve in the oil well working tool; as shown in fig. 3, the oil well working tool further comprises an elastic sleeve 10, and the elastic sleeve 10 is sleeved on the middle part of the outer surface of the connecting rod 7. The connecting rod 7 is provided with a torque transmission groove, and the lower side wall of the torque transmission groove is a torque transmission groove wall 7-2. Correspondingly, the upper end of the inner surface of the elastic sleeve 10 is provided with a torque transmission inner flange, and the lower side wall of the torque transmission inner flange is a torque transmission flange wall 10-2. When the torque transmission flange wall 10-2 and the torque transmission groove wall 7-2 are mutually engaged and pressed, torque can be transmitted between the connecting rod 7 and the elastic sleeve 10 by using friction force. Compared with CN209761371U, the device omits parts such as a release pawl, a shearing pawl and the like, and transmits torque by virtue of friction force generated by a screw pair in the process of being put into the device, so that the structure is simplified.

As shown in fig. 3, a first limiting outer flange is further disposed at the upper end of the outer surface of the elastic sleeve 10, a plurality of third axial grooves 10-1 are also disposed at the upper portion of the elastic sleeve 10, the third axial grooves 10-1 penetrate through the wall thickness of the upper portion of the elastic sleeve 10, and the plurality of third axial grooves 10-1 are distributed along the circumferential direction of the elastic sleeve 10. The provision of the third axial groove 10-1 allows the upper portion of the elastic sleeve 10 to be formed in a claw shape with a diameter that can be expanded and contracted. The first limiting outer flange of the elastic sleeve 10 has a smaller diameter when the first limiting outer flange of the elastic sleeve 10 is bound by the limiting inner flange at the bottom of the force transfer sleeve 8. When the force-transmitting sleeve 8 moves downwards relative to the elastic sleeve 10, corresponding to the first limit outer flange is a position of the force-transmitting sleeve 8 above the limit inner flange, the inner diameter of which is larger than the inner diameter of the limit inner flange, so that the upper part of the elastic sleeve 10 expands outwards.

As shown in fig. 3, the elastic sleeve 10 is further provided with a locking piece groove 10-4 penetrating in the radial direction, a locking piece 13 is arranged in the locking piece groove 10-4, a pin 11 parallel to the axial direction of the elastic sleeve 10 is penetrated in the locking piece 13, and the pin 11 is penetrated in a pin hole 10-3 at the lower part of the elastic sleeve 10. FIG. 4 is a schematic cross-sectional view of a lock block in the oil well tool; as shown in fig. 4, the lock block 13 has a protruding portion protruding from the outer surface of the lower portion of the elastic sleeve 10, and the upper surface of the protruding portion is a torque transmission protruding wall 13-1, and the torque transmission protruding wall 13-1 abuts against the lower surface of the torque transmission inner flange of the connecting sleeve 51.

As shown in fig. 1B, the external thread at the lower part of the connecting sleeve 51 is screwed with the internal thread at the upper part of the pressing ring 52. The inner surface of the middle part of the compression ring 52 is provided with an anti-rotation pin 53, and the anti-rotation pin 53 is embedded into an anti-rotation groove 54-1 at the upper part of the central tube 54, so that the central tube 54, the first lower joint 80 and the compression ring 52 can rotate together, namely, the upper joint 1, the connecting rod 7, the elastic sleeve 10, the connecting sleeve 51, the compression ring 52, the central tube 54 and the first lower joint 80 can rotate together.

Because the compression ring 52 and the connecting sleeve 51 are in threaded connection, the compression ring and the connecting sleeve can jointly move, when the compression ring and the connecting sleeve move downwards, the outer part of the locking block 13 is extruded, the torque transmission protruding wall 13-1 of the locking block 13 is subjected to downward pressure, and the torque transmission protruding wall 13-1 is a conical surface, so that the downward pressure can be converted into acting force for enabling the locking block 13 to move inwards. The pin 11 of the elastic sleeve 10 is cut off, and the spring 12 arranged in the locking piece groove 10-4 can drive the locking piece 13 to move inwards, so that the space formed by the connecting sleeve 51 and the pressing ring 52 is separated.

As shown in fig. 1B, in addition, a start shear screw 55 is further provided at the lower part of the pressure ring 52, and the pressure ring 52 is fixedly connected with the central tube 54 by the start shear screw 55. The outer surface of the upper part of the central tube 54 is also provided with locking threads 54-3, the locking threads 54-3 are matched with the internal threads of the locking ring 56, the locking threads 54-3 and the internal threads of the locking ring 56 are of triangular tooth structures, and when the locking ring 56 moves downwards relative to the central tube 54, the locking ring cannot be retracted, so that a locking effect can be generated. In addition, the pressure ring 52 is provided with a water passage 52-1 penetrating the wall thickness of the pressure ring 52.

As shown in fig. 1B, the central tube 54 is further sleeved with a sheath 57, and an internal thread at the upper part of the sheath 57 is in threaded connection with an external thread at the lower part of the compression ring 52. From the sheath 57 downwards, the central tube 54 is sequentially sleeved with a rubber guide shoe 58, a spacer ring 59, an inner rubber 60, an outer rubber 61, a limiting ring 62, an upper cone 64, slips 67, a guide ring 68 and a lower cone 70. Wherein the upper cone 64 is connected to the base pipe 54 by a first shear pin 65 and the bottom of the upper cone 64 is connected to slips 67 by a second shear pin 66. The guide ring 68 is fixed to the outer peripheral surface of the center tube 54 by fourth set screws 69. The outer peripheral surface of the central tube 54 is also provided with a second snap ring groove 54-4, and a second snap ring 63 is arranged in the second snap ring groove 54-4, wherein the second snap ring 63 can limit the maximum position of the upper cone 64 moving downwards relative to the central tube 54.

As shown in fig. 1B, a connector 27 is connected to the lower portion of the movable connecting rod 17 through a screw thread, and a ninth sealing ring 28 is disposed at the bottom of the outer surface of the movable connecting rod 17 to seal between the connector 27 and the movable connecting rod 17. The tenth sealing ring 29 and the two framework sealing rings 30 are arranged at the lower part of the outer surface of the connector 27 so as to realize the sealing between the connector 27 and the central tube 54. The lower part of the coupling head 27 is provided with an internal thread, by means of which the coupling head 27 is coupled to the locking cap 32. The lower part of the connector 27 is inserted into the loose joint 33, the top of the loose joint 33 is provided with a second limiting outer flange, and the second limiting outer flange is limited by the top surface of the locking cap 32 to prevent the loose joint 33 from moving downwards relative to the connector 27. The joint 27 and the loose joint 33 are rotatable relative to each other because there is no screw connection between the joint 27 and the loose joint 33 or a restriction of the relative rotation between the joint and the loose joint by a pin or a key or the like. In addition to the limiting effect on the loose joint 33, the locking cap 32 also has a flange portion, and the outer edge of the annular upper surface of the flange portion can fix the frame seal ring 30. In addition, the seal between the loose joint 33 and the connecting head 27 is also achieved by an eleventh sealing ring 31.

As shown in fig. 1B, the lower part of the loose joint 33 is provided with an external thread to be screwed with an internal thread on the upper part of the connecting cylinder 34. The bottom of the union 33 is sealed with the connecting cylinder 34 by a fifteenth seal ring 35 provided at the bottom of the outer surface of the union 33. The middle part of the inner surface of the connection cylinder 34 is screw-coupled with a ball seat 41, wherein the outer surface of the ball seat 41 is sealed with the inner surface of the connection cylinder 34 by a twelfth sealing ring 37, and the inner circumferential surface of the ball seat 41 is sealed with the ball seat 40 by a thirteenth sealing ring 38.

As shown in fig. 1B, a ball seat 40 is sleeved in a ball seat sleeve 41. The ball socket 41 is connected to the ball seat 40 by a second shear screw 39. Specifically, the second shear screw 39 is disposed in a second shear screw outer hole of the ball socket 41 below the twelfth and thirteenth seal rings 37 and 38, and the second shear screw 39 passes through a second shear screw inner hole in the middle of the ball seat 40. One of the second shear screw inner hole and the second shear screw outer hole is a threaded hole, and the other is a unthreaded hole. Of course, if the ball socket 41 and the ball seat 40 are mounted in place, then a threaded bore is continuously formed in both, which includes both the second shear screw bore and the second shear screw outer bore, as well as a viable solution. Ball seat 40 has an inverted conical surface with a large top and a small bottom, on which a steel ball 36 can be placed.

As shown in fig. 1B, a baffle 42 is also provided in the connecting barrel 34. Specifically, the inner threads of the lowermost portion of the connecting barrel 34 are threadedly coupled with the outer threads of the second lower joint 44. The baffle plate 42 is abutted against the end face of the stepped hole of the connecting cylinder 34 by the top face of the second lower joint 44 to achieve the installation in the connecting cylinder 34. The top of the outer peripheral surface of the second lower joint 44 is further provided with a fourteenth sealing ring 43, and the fourteenth sealing ring 43 is located above the external thread of the second lower joint 44. The lower part of the inner peripheral surface of the second lower joint 44 is also screw-coupled with a double male oil pipe 45.

The above-described all-around screw connections are right-handed screw connections except for the left-handed screw which is already clear.

The operation principle of the oil well operation tool is as follows:

The oil well operation tool is assembled on the ground firstly, then is put into the well, and if the oil well operation tool encounters obstruction in the running process, the oil well operation tool can rotate positively, and the clockwise rotation pipe column is released from obstruction when seen from the overlooking angle.

Specifically, the upper joint 1, the connecting rod 7 and the locking claw 15 are sequentially connected through screw threads, so that the upper joint, the connecting rod and the locking claw can rotate together. Since the male releasing screw 15-3 of the locking claw 15 and the female releasing screw 54-2 at the upper part of the center pipe 54 are left-handed screw, the locking claw 15 tends to move upward with respect to the center pipe 54 when the pipe string is rotated forward. The locking pawl 15 and the connecting rod 7 will tend to move upwards. At this time, the torque transfer groove wall 7-2 of the torque transfer groove of the connecting rod 7 is in contact with and pressed against the torque transfer flange wall 10-2 of the torque transfer inner flange of the elastic sleeve 10, and the generated static friction force is sufficient to transfer torque. Torque is transmitted to the lock block 13 through the lock block groove 10-4 of the elastic sleeve 10. At this time, the torque transmission protrusion wall 13-1 of the protrusion of the lock block 13 is in contact with and pressed against the lower surface of the torque transmission inner flange of the coupling sleeve 51, and the generated static friction force is sufficient to transmit torque. Further, the lock block 13 can drive the connecting sleeve 51 to rotate.

Since the connecting sleeve 51 is in threaded connection with the pressing ring 52, the pressing ring 52 is embedded into the anti-rotation groove 54-1 of the central tube 54 through the anti-rotation pin 53, and the central tube 54 is in threaded connection with the first lower joint 80 and locked through the first set screw 79, the connecting sleeve 51, the pressing ring 52, the central tube 54 and the first lower joint 80 can rotate together, so that the sand control pipe column fixed with the first lower joint 80 is driven to rotate together.

After the sand control string is run in place, steel balls 36 are thrown in from the wellhead, and the steel balls 36 fall onto the inverted conical holes of the ball seat 40. By pressing the drill rod into the upper joint 1, since the third pressure transmitting hole 7-1 penetrates the wall thickness direction of the connecting rod 7, the pressure between the upper joint 1 and the piston 6 increases, and a downward force can be applied to the piston 6 to push the piston 6 to move downward. When the initial shear pin 9 of the force transmission sleeve 8 cannot bear the downward force exerted by the piston 6 on the force transmission sleeve 8, the initial shear pin 9 is sheared, and the force transmission sleeve 8 moves downward. The upper portion of the elastic sleeve 10 is released. Since the connecting sleeve 51, the pressing ring 52, the locking ring 56 and the central tube 54 are fixedly connected, the force transmission sleeve 8 can push the connecting sleeve 51, the pressing ring 52, the locking ring 56, the sheath 57 and the central tube 54 downwards together after the lower end surface of the force transmission sleeve 8 is in contact with the connecting sleeve 51.

Continuing to press, the initial shear screw 55 cannot bear the pressure of the press ring 52 and is sheared. The compression ring 52 pushes the lock ring 56, the sheath 57, the rubber boot 58, the spacer ring 59, the inner rubber 60, the outer rubber 61, the stop collar 62 and the upper cone 64 downward. When the pressure exceeds the limit to which the first shear pin 65 is subjected, the first shear pin 65 shears and the upper cone 64 moves downwardly relative to the base pipe 54; when the pressure exceeds the limit that the second shear pin 66 is subjected to, the second shear pin 66 shears and the upper cone 64 moves downwardly relative to the slips 67. Therefore, the slips 67 are pushed by the upper cone 64, and guided by the guide ring 68, the lower end cone moves along the lower cone surface of the lower cone 70, which includes not only the axially downward movement of the slips 67 relative to the lower cone 70, but also the expansion caused by the radially outward movement of the slips 67, and the annular teeth tips of the slips 67 are stuck to the inner wall of the casing to form an anchor. And the outer rubber cylinder 61 and the inner rubber cylinder 60 are compressed in the vertical direction to generate radial expansion, so that the annular space between the inner wall of the sleeve and the working tool is sealed, and the setting is completed. In addition, the locking action is generated because of the triangular tooth-shaped structure of the locking thread 54-3 of the central tube 54 and the internal thread of the locking ring 56, and the locking ring 56 cannot be retracted after being relatively moved downward along the central tube 54.

If the setting of the steel ball 36 into the ball seat 40 fails, the hollow steel ball 23 can also be put into the ball seat for setting again.

When the seal checking operation is carried out, the annular space between the sleeve and the drill rod is pressed, the annular space between the operation tool and the sleeve is blocked by the inner rubber cylinder 60 and the outer rubber cylinder 61, liquid enters the operation tool from the water through hole 52-1 of the compression ring 52, and the liquid is blocked when moving downwards to the framework sealing ring 30, so that the seal checking operation can be realized.

Continuing to press into the drill rod, the liquid flows into the releasing hydraulic cavity through the second pressure transmission hole 17-2 of the movable connecting rod 17, pressure is generated on the releasing piston 22, and when the pressure cannot be balanced by the first shearing screw 21, the first shearing screw 21 is sheared. The release piston 22 moves downwardly and the support ring 24 moves downwardly therewith and disengages from the support ring inner flange 15-7 of the locking pawl 15. The release external threads 15-3 of the locking claw 15 lose sufficient engagement with the release internal threads 54-2 of the center tube 54.

Since the check ring 20 also moves downward with the release piston 22, when the check ring 20 is disengaged from the middle portion of the lock claw 15, it enters the lower portion of the lock claw 15, and since the second inner diameter of the lower portion of the lock claw 15 is larger than the first inner diameter of the middle portion of the lock claw 15, the check ring 20 is released outward, and the outer diameter returns to the size of the natural state, which is larger than the outer diameter of the release piston 22, and also larger than the first inner diameter. However, the check ring 20 is not disengaged from the check ring groove 20-1, and the check ring 20 is relatively axially fixed to the release piston 22. The releasing piston 22 cannot return to the middle part of the locking claw 15, and the natural releasing piston 22 cannot return to the original position, so that the supporting ring 24 cannot enter the supporting ring inner flange 15-7 again, and the hand piston 6 cannot form support again. At this time, the releasing operation is completed.

If the releasing operation fails, torque can be transmitted to the locking claw 15 through the tool forward rotating pipe column, the releasing external thread 15-3 of the locking claw 15 and the releasing internal thread 54-2 of the central pipe 54 are both left-handed, and the locking claw 15 can be upwards moved and unscrewed relative to the central pipe 54 by forward rotation, so that the locking claw 15 and the central pipe 54 are separated, and the forward rotating pipe column releasing operation is realized.

Continuing to press into the drill pipe, the hydraulic pressure applies downward pressure to the steel ball 36 and ball seat 40, and when the second shear screw 39 fails to withstand the pressure, the ball seat 40 drops to the lower stop 42, and the upper body drill pipe lifts the majority of the work tool from the wellbore, avoiding overflow of the liquid in the drill pipe to the drill floor. If a final seal is made with the hollow steel ball 23, the hollow steel ball 23 needs to be circulated to the surface before the upper body drill pipe.

It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.

In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. An oil well work tool, comprising:

The sealing sleeve is sleeved on the outer peripheral surface of the central tube in a sliding manner, the top of the sealing sleeve is fixedly connected with the lower cone, and the lower part of the sealing sleeve is in sealing connection with the central tube above and below the first pressure transmission hole to form a sealing hydraulic cavity;

The inner peripheral surface of the lower cone is provided with a first annular inner groove, a shear ring is arranged in the first annular inner groove, the shear ring is also arranged in a shear ring groove, and the shear ring groove is arranged on the outer peripheral surface of the central tube;

The lower cone is also provided with a fan-shaped slot hole penetrating the lower cone along the wall thickness direction, the inner end of the fan-shaped slot hole is connected with the first annular inner groove, the shearing ring is composed of a plurality of fan-shaped ring monomers, and the fan-shaped slot hole is used for enabling the fan-shaped ring monomers to pass through the fan-shaped slot hole from the outer side of the lower cone and enter between the first annular inner groove and the shearing ring groove;

the oil well operation tool further comprises a releasing mechanism and locking claws, wherein the lower parts of the locking claws are provided with a plurality of first axial grooves penetrating in the wall thickness direction of the locking claws, the first axial grooves extend in the axial direction of the locking claws and are distributed along the circumferential direction of the locking claws, the releasing mechanism comprises releasing pistons, the outer circumferential surfaces of the releasing pistons are sleeved with supporting rings, and the supporting rings are used for supporting the lower parts of the locking claws;

The oil well operation tool further comprises a movable connecting rod, the inner surface of the releasing piston is in sliding connection and sealing connection with the movable connecting rod, the outer surface of the releasing piston is in sealing connection with the locking claw, the locking claw is in sealing connection with the movable connecting rod, the movable connecting rod is provided with a second pressure transmission hole penetrating along the wall thickness direction of the movable connecting rod, and the second pressure transmission hole is communicated with the movable connecting rod, the releasing piston and a releasing hydraulic cavity formed between the locking claw are communicated with the inside of the movable connecting rod.

2. The oil well work tool of claim 1, wherein the base pipe is fixedly connected with a lower cone limit assembly, the lower cone limit assembly being located above the first pressure transfer hole and below the lower cone.

3. The oil well tool of claim 2, wherein the lower cone limit assembly comprises a stopper piston fixedly connected to the base pipe, an inner circumferential surface of the stopper piston being sealed to the base pipe, an outer circumferential surface of the stopper piston being sealed to the unsealing envelope.

4. The oil well working tool according to claim 1, wherein the release mechanism further comprises a check ring which is fitted into a check ring groove of an outer peripheral surface of the release piston, and the outer peripheral surface of the check ring is compressed in a radial direction by an inner peripheral surface of the lock claw middle portion, and a first inner diameter of the inner peripheral surface of the lock claw lower portion is larger than a second inner diameter of the inner peripheral surface of the lock claw middle portion.

5. The oil well work tool of claim 1, wherein the release piston is connected to the locking jaw by a first shear screw.

6. The oil well work tool of claim 5, wherein the lower portion of the locking claw is provided with a release external thread and is connected with a release internal thread on the top of the base pipe, the release internal thread and the release external thread being configured to allow the locking claw to move upward relative to the base pipe when the support ring is disengaged from the lower portion of the inner surface of the locking claw.

7. The oil well working tool according to any one of claims 1 to 6, further comprising an elastic sleeve, a connecting rod and an upper joint, wherein the elastic sleeve is sleeved on the connecting rod fixedly connected with the upper joint, a torque transmission groove is formed in the connecting rod, the torque transmission groove is provided with a torque transmission groove wall, the inner surface of the elastic sleeve is provided with a torque transmission inner convex rib, the torque transmission inner convex rib is provided with a torque transmission flange wall, and torque can be transmitted between the connecting rod and the elastic sleeve when the torque transmission flange wall and the torque transmission groove wall are mutually extruded.