CN114482907A

CN114482907A - Oil well operation tool

Info

Publication number: CN114482907A
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: 2022-05-13
Anticipated expiration: 2042-01-25
Also published as: CN114482907B

Abstract

The invention belongs to the technical field of oil well operation, and relates to an oil well operation tool. An 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 portion of the central pipe; the lower cone is provided with a lower conical surface which is small at the upper part and big at the lower part; and the unpacking sleeve is sleeved on the peripheral surface of the central pipe in a sliding manner, the top of the unpacking sleeve is fixedly connected with the lower cone, and the lower part of the unpacking sleeve is hermetically connected with the central pipe above and below the first pressure transmission hole to form an unpacking hydraulic cavity. The well tool described above may increase the inner diameter of a base pipe in a packer unsetting 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 in the world, and the reservoirs are easy to produce sand in the production process due to shallow burial and loose cementation. For oil production wells or water injection wells, the layered sand control is the main completion mode, and the top packer is the core tool in the layered sand control completion string and is usually matched with a setting tool for use, and the top packer can be taken out of a wellbore through a withdrawing tool when necessary.

In the prior art, the drift diameter size of the conventional packer suitable for 7-inch 23-29lb/ft pound-grade casing layered sand control is smaller, usually 3.25 ' or 3.88 ' and the maximum is 4 ', so that two problems are caused, namely the outer diameter of a water injection or oil production string tool is limited, the selection of a water injection or oil production process is limited, and the contradiction exists between the water injection or oil production process and the water injection or oil production process; secondly, the diameter of the drift is limited after sand prevention, the fishing tool for fishing the central pipe column is limited, the fishing efficiency is low, the complex condition is easy to occur, the well repairing period is long, the cost is high, and the injection allocation task is delayed.

Chinese patent CN209761371U (published 2019, 12, 10) discloses a bearing assembly for a tubular column and a tubular column, wherein a packer unsetting mechanism comprises a mandrel, an outer cylinder, a switch sleeve, a bearing ring and an unsetting pin, and the packer comprises four layers in a radial structure, and occupies a larger radial space; the releasing mechanism comprises a setting mandrel, a threaded locking block, a locking block supporting sleeve, a locking block reed and a positioning short section, and because the space between the lower part of the locking block supporting sleeve and the positioning short section is smaller and is directly communicated with the external space of the packer, sand particles are easy to block the downward movement of the locking block supporting sleeve after entering the space, thereby causing difficulty in releasing; the way of its transmission moment of torsion is transmitted release pawl, shearing pawl and last nipple joint in proper order through setting up the dabber, and it is more to relate to the part, and the structure is complicated.

Disclosure of Invention

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

The invention provides

An oil well working tool comprising:

the lower part of the central pipe is provided with a first pressure transfer hole which penetrates through the central pipe along the wall thickness direction;

the lower cone is provided with a lower conical surface which is small at the upper part and big at the lower part; and

the unpacking sleeve is sleeved on the peripheral surface of the central pipe in a sliding mode, the top of the unpacking sleeve is fixedly connected with the lower cone, and the lower portion of the unpacking sleeve is in sealing connection with the central pipe above and below the first pressure transfer hole to form an unpacking hydraulic cavity.

Through set up the biography pressure hole on the center tube to water injection and raising pressure in the space between deblocking cover and the center tube, can promote deblocking cover downstream, and drive the lower cone downstream rather than fixed connection, realize the deblocking, thereby can reduce packer deblocking mechanism's thickness. Correspondingly, the space in the central pipe can be enlarged so as to reserve a larger inner diameter of a well hole, a water injection or oil production pipe column with a larger size can be put in, the requirements of subsequent layered oil production and layered water injection processes are better met, and the difficulty in salvaging the central pipe column is avoided.

In a preferred technical scheme, the central 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 pipe, the inner circumferential surface of the stop piston is sealed with the central pipe, and the outer circumferential surface of the stop piston is sealed with the deblocking sleeve.

In the preferred technical scheme, the inner peripheral surface of lower cone is equipped with first annular inner groovy, install the shear ring in the first annular inner groovy, 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 cone still is equipped with and runs through along the wall thickness direction down the fan-shaped slotted hole of cone, the inner of fan-shaped slotted hole with first annular inner groovy links to each other, the shear ring has a plurality of fan ring monomers to constitute, fan-shaped slotted hole is used for making fan ring monomer by the outside of cone is down certainly fan-shaped slotted hole passes through and enters into first annular inner groovy with between the shear ring groove.

In the preferable technical scheme, the oil well operation tool further comprises a releasing mechanism and a locking claw, the lower portion of the locking claw is provided with a plurality of first axial grooves penetrating along the wall thickness direction of the locking claw, the first axial grooves extend along the axial direction of the locking claw and are distributed along the circumferential direction of the locking claw, the releasing mechanism comprises a releasing piston, a support ring is sleeved on the outer circumferential surface of the releasing piston, and the support ring is used for supporting the lower portion of the locking claw.

In a preferred technical scheme, the releasing mechanism further comprises a backstop locking ring, the backstop locking ring is embedded into a backstop locking ring groove in the outer peripheral surface of the releasing piston, the outer peripheral surface of the backstop locking ring is compressed in the radial direction by the inner peripheral surface of the middle part of the locking claw, and the first inner diameter of the inner peripheral surface of the lower part of the locking claw is larger than the second inner diameter of the inner peripheral surface of the middle part of the locking claw.

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

In the preferred technical scheme, the hydraulic releasing device 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, a releasing hydraulic cavity between the releasing piston and the locking claw and the inside of the movable connecting rod.

In a preferred technical solution, the lower part of the locking claw is provided with a releasing external thread and 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 upward relative to the central tube when the support ring is disengaged from the lower part of the inner surface of the locking claw.

Drawings

FIG. 1A is a schematic top cross-sectional view of an oil well working tool provided in an embodiment of the present invention;

FIG. 1B is a schematic cross-sectional view of the middle of the oil well working tool described above;

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

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

FIG. 3 is a schematic perspective view of the elastomeric sleeve of the oil well working tool described above;

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

FIG. 5 is a schematic cross-sectional view of a base pipe in the oil well working tool described above;

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

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

FIG. 7 is a perspective view of a single sector ring of the shear ring in the above-described oil well working tool;

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

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

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

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

fig. 11 is a schematic perspective view of the anti-backup lock ring in the oil well working tool.

The various reference numbers in the figures denote the following:

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. initially shearing the pin; 10. an elastic sleeve; 11. a pin shaft; 12 springs; 13. a locking block; 14. a third set screw; 15. a locking claw; 16. a sixteenth sealing 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. a release piston; 23. a hollow steel ball; 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 skeleton sealing ring; 31. an eleventh seal ring; 32. a locking cap; 33. a flexible 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 plate; 43. a fourteenth seal ring; 44. a second lower joint; 45. a double male oil pipe;

51. connecting sleeves; 52. pressing a ring; 52-1, a water through hole; 53. anti-rotation pins; 54. a central tube; 55. initiating a shear screw; 56. a locking ring; 57. a sheath; 58. guiding the rubber tube; 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. slips; 68. a guide ring; 69. a fourth set screw; 70. a lower cone; 71. a shear ring; 72. unsealing the screw; 73. unpacking; 74. a first snap ring; 75. a second seal ring; 76. a third seal ring; 77. a stopper piston; 78. a first seal ring; 79. a first set screw; 80. a first lower joint;

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

10-1, a third axial groove; 10-2, a torque transmission flange wall; 10-3, pin shaft holes; 10-4, a lock block groove;

13-1, torque transmission protruding wall;

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

70-1, forming a fan-shaped slot hole; 70-2, a first annular inner groove; 70-3, second axial grooves; 70-4, descending a cone inner step;

15-1, inclined steps; 15-2, a first axial slot; 15-3, releasing external threads; 15-4, a water trough; 15-5, a first straight step; 15-6, a first shear screw outer bore; 15-7, supporting the inner flange of the ring;

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

20-1, a locking ring groove for stopping withdrawing; 20-2, first shear screw bore.

Detailed Description

For a better understanding of the objects, structure and function of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.

FIG. 1C is a schematic view of a cross-sectional view of the lower portion of the oil well working tool; fig. 5 is a schematic cross-sectional view of the base pipe in the oil well working tool described above. As shown in fig. 1C and 5, the oil well working tool according to the present embodiment includes: a central tube 54, wherein the lower part of the central tube 54 is provided with a first pressure transmission hole 54-8 which penetrates through 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 small upper part and a big lower part; and the unpacking sleeve 73 is sleeved on the outer peripheral surface of the central pipe 54 in a sliding manner, the top of the unpacking sleeve 73 is fixedly connected with the lower cone 70, and the lower part of the unpacking sleeve 73 is hermetically connected with the central pipe 54 above and below the first pressure transmission hole 54-8 to form an unpacking hydraulic cavity.

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

The deblocking sleeve 73 can be fixed to the lower cone 70 through the deblocking screw 72, specifically, a threaded hole penetrating in the wall thickness direction can be formed in the deblocking sleeve 73, and the deblocking screw 72 is in threaded connection with the threaded hole. A counterbore is provided in the middle of the outer circumference of the lower cone 70 and a release screw 72 extends into and mates with the counterbore.

Through set up the biography pressure hole on center tube 54 to water injection and raising pressure in the space between deblocking cover 73 and center tube 54, can promote deblocking cover 73 and move down, and drive its fixed connection's lower cone 70 and move down, realize the deblocking, thereby can reduce packer deblocking mechanism's thickness. Correspondingly, the space in the central pipe 54 can be enlarged so as to reserve a larger borehole inner diameter, and a larger-size water injection or oil production pipe column can be put in, so that the requirements of subsequent layered oil production and layered water injection processes are better met, and the difficulty in fishing the central pipe 54 column is avoided.

As shown in FIG. 1C, preferably, a lower cone stop assembly is fixedly attached to the center tube 54, above the first transfer ports 54-8 and below the lower cone 70.

Specifically, in the present embodiment, an outer peripheral surface of the lower end of the center tube 54 is provided with an external thread, and the lower end of the center tube 54 is connected to the first lower joint 80 through the external thread. The first lower joint 80 is further provided at a top end thereof with a first set screw 79, the first set screw 79 passes through the first lower joint 80 in a radial direction of the first lower joint 80 and is screwed with the first lower joint 80, and an inner end of the first set screw 79 abuts against a portion of the lower outer circumferential surface of the center pipe 54 located above the external thread, thereby preventing the first lower joint 80 and the center pipe 54 from rotating relative to each other.

By fixedly connecting the lower limiting assembly to the central tube 54, the lower cone 70 is prevented from moving too low relative to the central tube 54, and the lower cone 70 collides with the first lower joint 80, thereby damaging the lower cone 70 or the first lower joint 80.

As shown in fig. 1C, preferably, the lower cone limiting assembly includes a stop piston 77 fixedly connected to the central tube 54, an inner circumferential surface of the stop piston 77 is sealed with the central tube 54, and an outer circumferential surface of the stop piston 77 is sealed with the deblocking sleeve 73.

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

Wherein, the outer circumferential surface of the stopper piston 77 is fixedly provided with a second sealing ring 75 to realize the sliding sealing between the outer circumferential surface of the stopper piston 77 and the unsealing sleeve 73; a third seal ring 76 is fixedly mounted on the inner peripheral surface of the stopper piston 77 to seal the inner peripheral surface of the stopper piston 77 with the center pipe 54. In addition, a first annular outer groove 54-6 is further formed in the outer peripheral surface of the lower portion of the central tube 54, a lower cone inner step 70-4 protruding inwards and a second axial groove 70-3 extending in the axial direction and penetrating in the wall thickness direction are further formed in the bottom of the lower cone 70, and when the lower portion of the lower cone 70 is placed on the upper portion of the unsealing sleeve 73, due to the fact that the second axial groove 70-3 is formed and the first annular outer groove 54-6 is formed in the central tube 54, the lower portion of the lower cone 70 can be shrunk inwards, and therefore installation convenience is improved.

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

FIG. 6A is a schematic cross-sectional view of the lower cone in the oil well working tool described above; as shown in fig. 1C and 6A, it is preferable that 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 a 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 is maintained stationary relative to the base pipe 54 to provide an upward force to the lower cone 70 when it is desired to maintain a set condition, and during expansion of the slips 67 radially outward by the lower cone 70 and the upper cone 64. When the unsealing starts, liquid is filled in the unsealing hydraulic cavity, the downward pressure applied to the unsealing sleeve 73 is increased, and further, the unsealing sleeve 73 can drive the lower cone 70 to shear the shear ring 71, so that the lower cone 70 cannot extrude and expand the slips 67 outwards together with the upper cone 64, and the unsealing is realized.

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

By arranging the shear ring 71 to be composed of a plurality of fan-shaped ring monomers and arranging the fan-shaped slotted hole 70-1 penetrating along the wall thickness direction on the lower cone 70, 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, the single fan-shaped ring monomer can be thrown along the fan-shaped slotted hole 70-1, and then the thrown fan-shaped ring monomer moves along the shear ring groove 54-5 along the circumferential direction of the central tube 54 to form a space on the shear ring groove 54-5, so that the subsequent fan-shaped ring monomer can enter. After the last sector ring single body is put in, the central tube 54 and the lower cone 70 are relatively rotated, so that the two finally put-in sector ring single bodies have local parts corresponding to the sector slotted holes 70-1, and all the sector ring single bodies cannot leak out of the sector slotted holes 70-1. In this embodiment, the shear ring 71 may be constructed of at least eight fan ring segments.

With the above-described configuration, it is possible to avoid the need for fixing the shear ring 71 by another component in order to reduce the diameter of the outer peripheral surface of the center pipe 54 above or below the shear ring groove 54-5 in order to attach the shear ring 71, and it is also possible to avoid the need for fixing the shear ring 71 by another component in order to increase the diameter of the inner peripheral surface of the lower cone 70 above or below the first annular inner groove 70-2 in order to attach the shear ring 71 in order to fix the shear ring 71 to the lower cone 70.

FIG. 1B is a schematic cross-sectional view of the middle of the oil well working tool described above; fig. 8A is a schematic perspective view of a locking claw in the oil well working tool; FIG. 8B is a schematic cross-sectional view of the locking pawl in the oil well working tool described above; as shown in fig. 1B and fig. 8A and 8B, preferably, the oil well working tool further comprises a releasing mechanism and a locking claw 15, wherein the lower part of the locking claw 15 is provided with a plurality of first axial grooves 15-2 penetrating along the wall thickness direction 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 peripheral 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 releasing piston 22 is fixedly connected with a fixing ring 26 by means of a second set screw 21, the fixing ring 26 is located below the supporting ring 24, and the upper side of the supporting ring 24 is located by means of the pillow block of the releasing piston 22, whereby the axial positioning of the supporting ring 24 relative to the releasing piston 22 is accomplished, so that the supporting ring 24 can move axially together with the releasing piston 22. The locking claw 15, the releasing piston 22 and the fixing ring 26 are not directly communicated with the outside of the work tool because of the large space below the locking claw, the releasing piston 22 and the fixing ring 26, and are not easily stuck by sand.

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

The lower part of the locking claw 15 can be made to be telescopic in the radial dimension by arranging the first axial groove 15-2 at the lower part of the locking claw 15, the releasing piston 22 is sleeved with the support ring 24, when the support ring 24 is positioned inside 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, so that the releasing operation is completed.

As shown in fig. 8A and 8B, a first external annular flange is further provided at a middle portion of the outer surface of the locking claw 15, and a lower end surface of the first external annular flange is an inclined step 15-1 and is engaged with an upper end surface of the central tube 54. Furthermore, a water passage groove 15-4 is provided in the first external annular flange so as to penetrate the first external annular flange in the axial direction of the locking claw 15, thereby supplying water into the center pipe 54.

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

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

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

Specifically, as shown in fig. 8B and 10, the first shear screw 21 is disposed in the first shear screw inner hole 20-2 of the releasing piston 22 below the anti-backlash lock 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 locking claw 15. One of the first shear screw inner hole 20-2 and the first shear screw outer hole 15-6 is a threaded hole, and the other is a smooth hole. Of course, it is also possible to continuously machine a threaded bore including both the first shear screw inner bore 20-2 and the first shear screw outer bore 15-6 after the release piston 22 and the locking claw 15 are installed in place.

By providing the first shear screw 21 to connect the releasing piston 22 and the locking claw 15, the relatively fixed connection of the releasing piston 22 and the locking claw can be maintained when the releasing piston is subjected to a small axial force; when the releasing piston 22 is subjected to a large axial force, the first shear screw 21 can be sheared, so that the releasing piston 22 and the locking claw 15 move relatively.

FIG. 9 is a schematic cross-sectional view of the movable connecting rod in the oil well working tool described above; as shown in fig. 9, it is preferable that the hydraulic releasing device further comprises a movable connecting rod 17, the inner surface of the releasing piston 22 is connected with the movable connecting rod 17 in a sliding and sealing manner, the outer surface of the releasing piston 22 is connected with the locking claw 15 in a sealing manner, the locking claw 15 is connected with the movable connecting rod 17 in a sealing manner, 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, the second pressure transmission hole 17-2 is communicated with a releasing hydraulic cavity between the movable connecting rod 17, the releasing 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 to be in sealing connection with the movable connecting rod 17, and since there is no direct fixing means between the releasing piston 22 and the movable connecting rod 17, the releasing piston 22 and the movable connecting rod 17 are slidably connected. And a fifth sealing ring 18 is arranged on 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. And a 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 working tool described above; as shown in fig. 1B and 2, the upper portion of the locking claw 15 is fixedly connected to the lower outer peripheral surface of the connecting rod 7 by the 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. Furthermore, a first annular inner flange which protrudes inwards is arranged in the middle of the inner circumferential 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 on a second annular outer flange arranged at the top of the movable connecting rod 17, and a third set screw 14 is additionally arranged to fixedly connect the upper part of the locking claw 15 with the lower part of the connecting rod 7. Therefore, the locking claw 15 is fixedly connected with the movable connecting rod 17.

Therefore, 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 a 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 cannot balance the hydraulic force and the first shear screw 21 shears. Thus, the releasing piston 22 can move downwards relative to the locking claw 15 and the movable connecting rod 17, so that the supporting ring 24 no longer supports the lower part of the locking claw 15, and the anti-backing lock ring 20 can also be withdrawn from the middle part of the locking claw 15, enter the lower part of the locking claw 15 and expand, so that the anti-backing lock ring 20 is prevented from entering the middle part of the locking claw 15 again, and the supporting ring 24 is prevented from supporting the lower part of the locking claw 15 again to influence the separation of the locking claw 15 from the central tube 54.

As shown in fig. 1B and fig. 8A and 8B, it is preferable that the lower portion of the locking claw 15 is provided with a releasing external thread 15-3 and connected with a releasing internal thread 54-2 on the top of the center tube 54, and the releasing internal thread 54-2 and the releasing external thread 15-3 are configured to allow the locking claw 15 to move upward with respect to the center tube 54 when the support ring 24 is released from the lower portion of the inner surface of the locking claw 15.

Specifically, in this embodiment, the releasing external thread 15-3 and the releasing internal thread 54-2 are both 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 releasing external thread 15-3 of the lower portion of the locking claw 15 can be reduced and the force between the releasing internal thread 54-2 can be weakened. When the locking claw 15 is lifted upwards, the central tube 54 is no longer carried upwards.

By arranging the releasing external thread 15-3 and the releasing internal thread 54-2, a tool is additionally put in under the condition that the first shearing screw 21 cannot be sheared by the releasing piston 22 and the locking claw 15 is separated from the central pipe 54 in a manner that the outer diameter of the lower part of the locking claw 15 can be reduced, so that the locking claw 15 is driven to rotate, and the locking claw 15 is separated from the central pipe 54.

As shown in fig. 9, in addition, a tapered hole section 17-3 with a large top and a small bottom is processed in the middle of the inner surface of the movable connecting rod 17, and a hollow steel ball 23 can be put into the tapered hole section 17-3 to realize re-setting after the later-mentioned ball throwing setting fails.

FIG. 1A is a schematic top cross-sectional view of an oil well working tool provided in an embodiment of the present invention; as shown in fig. 1A, the oil well working tool further includes an upper joint 1, a lower portion of an inner surface of the upper joint 1 is threadedly connected to a top portion of the connecting rod 7 through an internal thread, and a lower portion of an outer surface of the upper joint 1 is threadedly connected to the piston outer cylinder 2 through an external thread. And a sixth sealing ring 3 is arranged at the lower part of the inner surface of the upper joint 1 to realize sealing with the top of the connecting rod 7, wherein the sixth sealing ring 3 is positioned below the internal thread at the lower part of the inner surface of the upper joint 1. And a seventh sealing ring 4 is arranged at the lower part of the outer surface of the upper joint 1 to realize sealing with the piston outer cylinder 2, wherein the seventh sealing ring 4 is positioned below the external thread at 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 seal 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 connecting rod 7 in the wall thickness direction is formed in 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 over against the lower surface of the upper joint 1. When the liquid in the connecting rod 7 flows into between the upper joint 1 and the piston 6 through the third pressure transfer hole 7-1, a downward force may be applied to the piston 6 to push the piston 6 to move downward.

The middle part of the connecting rod 7 is also sleeved with a force transmission sleeve 8, and the force transmission sleeve 8 is fixed with the connecting rod 7 through a starting shearing pin 9. The top of the force transmission sleeve 8 is abutted against the bottom of the piston 6, when the piston 6 is subjected to downward hydraulic pressure, the pressure is transmitted to the force transmission sleeve 8, and when the initial shearing pin 9 cannot bear the downward acting force applied to the force transmission sleeve 8 by the piston 6, the initial shearing pin 9 is sheared, and the force transmission sleeve 8 moves downward.

FIG. 3 is a schematic perspective view of the elastomeric sleeve of the oil well working tool described above; 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 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 attached to each other and pressed, a torque can be transmitted between the connecting rod 7 and the elastic sleeve 10 by using a frictional force. Compared with CN209761371U, parts such as release pawl, shearing pawl have been cancelled, rely on the frictional force that screw thread pair produced to transmit the moment of torsion in the process of going into, simplified the structure.

As shown in fig. 3, the upper end of the outer surface of the elastic sleeve 10 is further provided with a first limiting outer flange, the upper portion of the elastic sleeve 10 is also provided with a plurality of third axial grooves 10-1, 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 third axial groove 10-1 is provided so that the upper portion of the elastic sleeve 10 is formed in a claw shape and the diameter thereof can be expanded and contracted. When the first limiting outer flange of the elastic sleeve 10 is restrained by the limiting inner flange at the bottom of the force transmission sleeve 8, the diameter of the first limiting outer flange of the elastic sleeve 10 is smaller. When the force-transmitting sleeve 8 moves downwards relative to the elastic sleeve 10, the position of the force-transmitting sleeve 8 above the limiting inner flange corresponds to the first limiting outer flange, and the inner diameter of the position-transmitting sleeve 8 is larger than that of the limiting 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 lock block groove 10-4 which penetrates through the elastic sleeve along the radial direction, a lock block 13 is arranged in the lock block groove 10-4, a pin shaft 11 which is parallel to the axial direction of the elastic sleeve 10 penetrates through the lock block 13, and the pin shaft 11 penetrates through a pin shaft hole 10-3 at the lower part of the elastic sleeve 10. FIG. 4 is a schematic cross-sectional view of the lock block in the oil well working tool; as shown in fig. 4, the locking piece 13 has a protrusion protruding from the lower outer surface of the elastic sleeve 10, the upper surface of the protrusion is a transmission protrusion wall 13-1, and the transmission protrusion wall 13-1 abuts against the lower surface of the transmission inner flange of the connection sleeve 51.

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

Since the pressing ring 52 and the connecting sleeve 51 are screwed and can move together, when the pressing ring and the connecting sleeve move downwards, the outer part of the locking piece 13 is pressed, the transmission protruding wall 13-1 of the locking piece 13 is pressed downwards, and the transmission protruding wall 13-1 is a conical surface, so that the pressed downwards pressure can be converted into acting force which enables the locking piece 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 as to leave the space formed by the connecting sleeve 51 and the pressing ring 52.

As shown in fig. 1B, a lower portion of the pressing ring 52 is further provided with a start shear screw 55, and the pressing ring 52 is fixedly connected to the central tube 54 by the start shear screw 55. The upper outer surface of the center tube 54 is further provided with locking threads 54-3, the locking threads 54-3 are matched with the inner threads of the locking ring 56, the locking threads 54-3 and the inner threads of the locking ring 56 are both of triangular tooth-shaped structures, and when the locking ring 56 cannot retract after downward relative movement with respect to the center tube 54, a locking effect can be generated. The pressing ring 52 is also provided with a water passage hole 52-1 penetrating the wall thickness of the pressing ring 52.

As shown in fig. 1B, a sheath 57 is further sleeved on the central tube 54, and an internal thread on the upper portion of the sheath 57 is in threaded connection with an external thread on the lower portion of the pressing ring 52. From the sheath 57 downwards, the central tube 54 is sleeved with a rubber tube guide shoe 58, a spacer ring 59, an inner rubber tube 60, an outer rubber tube 61, a limiting ring 62, an upper cone 64, a slip 67, a guide ring 68 and a lower cone 70 in sequence. 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 a fourth set screw 69. The outer peripheral surface of the center tube 54 is further provided with a second snap ring groove 54-4, and a second snap ring 63 is provided 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 downward relative to the center tube 54.

As shown in fig. 1B, the lower portion of the movable connecting rod 17 is connected with a connector 27 through a thread, and a ninth sealing ring 28 is disposed at the bottom of the outer surface of the movable connecting rod 17 to seal the connector 27 and the movable connecting rod 17. The lower part of the outer surface of the connecting head 27 is provided with a tenth sealing ring 29 and two skeleton sealing rings 30 to realize the sealing of the connecting head 27 and the central tube 54. The lower portion of the connector 27 is provided with an internal thread through which the connector 27 is connected to the locking cap 32. The lower part of the connector 27 is inserted into the movable joint 33, the top of the movable 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 movable joint 33 from moving downwards relative to the connector 27. The connecting head 27 and the loose joint 33 are relatively rotatable because there is no threaded connection or limited by a pin or key that limits the relative rotation between the connecting head 27 and the loose joint 33. Besides the limiting function of the locking cap 32 on the loose joint 33, the locking cap 32 also has a flange part, and the outer edge of the annular upper surface of the flange part can fix the skeleton sealing ring 30. In addition, the movable joint 33 and the connecting head 27 are sealed by an eleventh sealing ring 31.

As shown in fig. 1B, the lower portion of the loose joint 33 is provided with an external thread to be screwed with an internal thread on the upper portion of the connecting cylinder 34. The bottom of the movable joint 33 is sealed with the connecting cylinder 34 by a fifteenth sealing ring 35 provided at the bottom of the outer surface of the movable joint 33. A ball seat sleeve 41 is threadedly coupled to a middle portion of an inner surface of the coupling tube 34, wherein an outer surface of the ball seat sleeve 41 is sealed with the inner surface of the coupling tube 34 by a twelfth packing 37, and an inner circumferential surface of the ball seat sleeve 41 is sealed with a ball seat 40 by a thirteenth packing 38.

As shown in fig. 1B, a ball seat 40 is fitted in the ball seat sleeve 41. The ball socket sleeve 41 is connected to the ball socket 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 seat sleeve 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. Wherein, one in second shear screw hole and the second shear screw outer bore be the screw hole can, the other is the unthreaded hole. Of course, it is also possible to continuously machine a threaded bore including both the second shear screw inner bore and the second shear screw outer bore for both the ball socket sleeve 41 and the ball socket 40 after they are installed in place. The ball seat 40 has a reverse tapered surface with a large top and a small bottom, and a steel ball 36 can be placed on the reverse tapered surface.

As shown in fig. 1B, a baffle 42 is also provided in the connector barrel 34. Specifically, the lowermost internal thread of the connecting cylinder 34 is threadedly connected with the external thread of the second lower joint 44. The shutter 42 is abutted by the top face of the second lower joint 44 on the end face of the stepped hole of the connector barrel 34 to achieve mounting in the connector barrel 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 portion of the inner peripheral surface of the second lower joint 44 is also threadedly connected with a double male oil pipe 45.

The threaded connections in the respective portions are right-handed threads, except for the already-known left-handed threads.

The operating principle of the oil well working tool is as follows:

the oil well operation tool is firstly assembled on the ground and then is put into the well, if the oil well operation tool encounters an obstruction in the putting-in process, the oil well operation tool can rotate forwards, namely the pipe column rotates clockwise from the overlooking angle to remove the obstruction.

Specifically, the upper joint 1, the connecting rod 7 and the locking claw 15 are sequentially in threaded connection, so that the upper joint, the connecting rod and the locking claw can rotate together. Since the external releasing thread 15-3 of the locking claw 15 and the internal releasing thread 54-2 on the upper portion of the center tube 54 are both left-handed threads, the locking claw 15 tends to move upward relative to the center tube 54 when the pipe string is rotated in the normal direction. The locking claw 15 and the connecting rod 7 will have a tendency to move upwards. At this time, the torque transmission groove wall 7-2 of the torque transmission groove of the connecting rod 7 and the torque transmission flange wall 10-2 of the torque transmission inner flange of the elastic sleeve 10 are contacted and pressed with each other, and the static friction force generated by the static friction force is enough to transmit the torque. The torque is transmitted to the locking piece 13 through the locking piece slot 10-4 of the elastic sleeve 10. At this time, the torque transmission protrusion wall 13-1 of the protrusion of the locking piece 13 and the lower surface of the torque transmission inner flange of the connection sleeve 51 are contacted and pressed with each other, and the static friction force generated by the same is enough to transmit the torque. Further, the lock block 13 can drive the connection sleeve 51 to rotate.

Because 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 pipe 54 through the anti-rotation pin 53, and the central pipe 54 is in threaded connection with the first lower joint 80 and locked by the first set screw 79, the connecting sleeve 51, the pressing ring 52, the central pipe 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 pipe column is put into place, the steel ball 36 is thrown in from the wellhead, and the steel ball 36 falls on the inverted taper hole of the ball seat 40. By pressing the drill rod into the upper joint 1, the pressure between the upper joint 1 and the piston 6 is increased due to the third pressure transfer hole 7-1 penetrating the wall thickness direction of the connecting rod 7, and a downward force can be applied to the piston 6 to push the piston 6 to move downwards. When the initial shear pin 9 of the force transmission sleeve 8 cannot bear the downward acting force applied 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 sheath 10 is released. Since the connection sleeve 51, the collar 52, the locking ring 56 and the central tube 54 are fixedly connected, the force-transmitting sleeve 8 can push the connection sleeve 51, the collar 52, the locking ring 56, the sheath 57 and the central tube 54 downward together after the lower end surface of the force-transmitting sleeve 8 is in contact with the connection sleeve 51.

The initial shear screw 55 is not subjected to the pressure of the pressing ring 52 and is cut off by the continued pressing. The pressing ring 52 pushes the locking ring 56, the sheath 57, the rubber barrel guide 58, the spacer ring 59, the inner rubber barrel 60, the outer rubber barrel 61, the limiting ring 62 and the upper cone 64 to move downwards. When the pressure exceeds the limit to which the first shear pin 65 is subjected, the first shear pin 65 is sheared and the upper cone 64 moves downward relative to the base pipe 54; when the pressure exceeds the limit to which the second shear pin 66 is subjected, 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 the lower conical surface of the slips moves along the lower conical surface of the lower cone 70 under the guidance of the guide ring 68, and the movement includes not only the axial downward movement of the slips 67 relative to the lower cone 70, but also the expansion caused by the radial outward movement of the slips 67, and the annular tooth tips of the slips 67 are clamped on the inner wall of the casing to form an anchor. And the outer rubber sleeve 61 and the inner rubber sleeve 60 are compressed in the vertical direction and then radially expanded to seal the annular space between the inner wall of the gland pipe and the operation tool, so that the setting is completed. In addition, the locking ring 56 cannot be withdrawn after relative movement is produced down the center tube 54 due to the triangular thread pattern of the locking threads 54-3 of the center tube 54 and the internal threads of the locking ring 56, thereby producing a locking action.

If the steel ball 36 is not dropped into the ball seat 40 for setting, the hollow steel ball 23 can be dropped into the ball seat for setting again.

When the seal checking operation is performed, 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, and the liquid enters the operation tool from the water through hole 52-1 of the pressing ring 52 and is blocked when moving downwards to the framework sealing ring 30, so that the seal checking operation can be realized.

And when the pressure is continuously exerted 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 to generate pressure on the releasing piston 22, and when the pressure cannot be balanced by the first shear screw 21, the first shear screw 21 is sheared. The release piston 22 moves downwards and the support ring 24 moves downwards and disengages from the support ring inner flange 15-7 of the locking claw 15. The releasing external thread 15-3 of the locking claw 15 loses a sufficient engaging force with the releasing internal thread 54-2 of the center tube 54.

Since the anti-backing lock ring 20 also moves downward with the releasing piston 22, when the anti-backing lock ring 20 is disengaged from the middle of the locking claw 15, it enters the lower part of the locking claw 15, and since the second inner diameter of the lower part of the locking claw 15 is larger than the first inner diameter of the middle part of the locking claw 15, the anti-backing lock 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 releasing piston 22 and is also larger than the first inner diameter. However, the check lock ring 20 is not disengaged from the check lock ring groove 20-1 and the check lock ring 20 is axially fixed relative to the thrower piston 22. The releasing piston 22 can not return to the middle of the locking claw 15, and naturally the releasing piston 22 can not return to the original position, so the supporting ring 24 can not enter the inner flange 15-7 of the supporting ring again, and the hand piston 6 can not be supported again. At this point, the release job is completed.

If the releasing is failed, torque can be transmitted to the locking claw 15 through the tool forward rotation 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 both rotate leftwards, the two locking claws 15 can move upwards and rotate out relative to the central pipe 54 through forward rotation, and then the two locking claws are separated, so that forward rotation pipe column releasing is achieved.

Continuing to force the drill string, the hydraulic pressure applies downward pressure to the steel ball 36 and ball seat 40, which shears off when the second shear screw 39 fails to withstand this pressure, the ball seat 40 drops to the lower stop plate 42, and the upper body drill string lifts the bulk of the work tool out of the wellbore, preventing the liquid in the drill string from overflowing to the rig floor. If the hollow steel ball 23 is finally sealed, the hollow steel ball 23 needs to be circulated to the ground before the upper drill rod.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

In the description of the present application, it is to be understood that the terms "length", "width", "thickness", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

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

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. An oil well working tool, comprising:

2. An oil well working tool as claimed in claim 1, wherein a lower cone stop assembly is fixedly attached to the base pipe, the lower cone stop assembly being located above the first transfer bore and below the lower cone.

3. An oil well operation tool as claimed in claim 2, wherein the lower cone stop assembly comprises a stop piston fixedly connected to the central pipe, an inner circumferential surface of the stop piston being sealed to the central pipe and an outer circumferential surface of the stop piston being sealed to the release sleeve.

4. An oil well working tool according to claim 1, characterized in that the inner circumferential surface of the lower cone is provided with a first annular inner groove in which a shear ring is mounted, the shear ring also being mounted in a shear ring groove provided in the outer circumferential surface of the base pipe.

5. An oil well working tool according to claim 4, wherein said lower cone is further provided with a sector groove hole penetrating through said lower cone in a wall thickness direction, an inner end of said sector groove hole is connected to said first annular inner groove, said shear ring is composed of a plurality of sector ring single bodies, and said sector groove hole is provided for allowing said sector ring single bodies to pass from said sector groove hole to enter between said first annular inner groove and said shear ring groove from an outer side of said lower cone.

6. An oil well working tool according to any one of claims 1-5, characterized in that the oil well working tool further comprises a releasing mechanism and a locking claw, the lower part of the locking claw is provided with a plurality of first axial grooves penetrating in the wall thickness direction of the locking claw, the first axial grooves extend in the axial direction of the locking claw and are distributed along the circumferential direction of the locking claw, the releasing mechanism comprises a releasing piston, the outer circumferential surface of the releasing piston is sleeved with a support ring, and the support ring is used for supporting the lower part of the locking claw.

7. An oil well working tool according to claim 6, wherein the releasing mechanism further comprises a backstop lock ring which is fitted into a backstop lock ring groove of the outer peripheral surface of the releasing piston, and the outer peripheral surface of the backstop lock ring is radially compressed by the inner peripheral surface of the middle part of the locking claw, and the first inner diameter of the inner peripheral surface of the lower part of the locking claw is larger than the second inner diameter of the inner peripheral surface of the middle part of the locking claw.

8. An oil well working tool according to claim 6, wherein the releasing piston is connected to the locking claw by a first shear screw.

9. An oil well working tool according to claim 6, further comprising a movable connecting rod, wherein the inner surface of the releasing piston is slidably and sealingly connected with the movable connecting rod, the outer surface of the releasing piston is sealingly connected with the locking claw, the locking claw is sealingly connected with the movable connecting rod, the movable connecting rod is provided with a second pressure transmitting hole penetrating in the wall thickness direction of the movable connecting rod, and the second pressure transmitting hole communicates with a releasing hydraulic chamber between the movable connecting rod, the releasing piston and the locking claw, and the inside of the movable connecting rod.

10. An oil well working tool according to claim 8, wherein 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 base pipe, and the releasing internal thread and the releasing external thread are configured to allow the locking claw to move upward relative to the base pipe when the support ring is disengaged from the lower part of the inner surface of the locking claw.

11. An oil well working tool according to any one of claims 1-10, 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, the connecting rod is provided with a torque transmission groove, 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 rib, the torque transmission inner rib is provided with a torque transmission flange wall, and when the torque transmission flange wall and the torque transmission groove wall are pressed against each other, torque can be transmitted between the connecting rod and the elastic sleeve.