CN110608011B

CN110608011B - Deblocking assembly, packer with deblocking assembly and deblocking method

Info

Publication number: CN110608011B
Application number: CN201910872128.XA
Authority: CN
Inventors: 马辉运; 王威林; 熊杰; 董宗豪; 唐寒冰; 周玮; 朱鹏; 杨海; 冯星铮
Original assignee: Sichuan Shengnuo Oil And Gas Engineering Technology Service Co ltd; Engineering Technology Research Institute of Sinopec Southwest Oil and Gas Co
Current assignee: Sichuan Shengnuo Oil And Gas Engineering Technology Service Co ltd; Petrochina Co Ltd
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2020-05-12
Anticipated expiration: 2039-09-16
Also published as: CN110608011A

Abstract

The invention discloses a deblocking assembly, a packer with the deblocking assembly and a deblocking method, wherein the packer comprises a central pipe (001) and a slip assembly, and an upper push cylinder, a rubber cylinder assembly and a lower push cylinder (17) are sequentially sleeved on the outer side wall of the central pipe (001) from top to bottom; the slip assembly comprises an upper cone (18), a lower cone (22), a slip frame (19), slips (20) and a spring (21); the upper cone (18) is sleeved on the central tube (001), and the upper end of the upper cone (18) is connected with the lower end of the lower push cylinder (17) through threads; the lower cone (22) is sleeved at the lower end of the central tube (001); the upper end of the slip frame (19) is fixed on the upper cone (18), the lower end of the slip frame is sleeved on the outer side wall of the lower cone (22), the slip (20) and the spring (21) are arranged between the upper cone (18) and the lower cone (22), and slip holes for the slip (20) to leak are formed in the slip frame (19).

Description

Deblocking assembly, packer with deblocking assembly and deblocking method

Technical Field

The invention relates to a packer with a deblocking assembly and a deblocking method, in particular to the deblocking assembly, the packer with the deblocking assembly and the deblocking method.

Background

At present, in oil and gas exploitation field, often can be provided with the packer in the oil and gas well, when the packer does not use, need take out the packer from the oil and gas well in, but the technique of taking out the packer now, the cost is higher, especially when taking out permanent packer, need adopt the drill bit to bore permanent packer, and some cost is up to tens of millions, and time cycle is longer moreover.

Disclosure of Invention

One objective of the present invention is to provide a deblocking assembly, a packer having the deblocking assembly, and a deblocking method, so as to solve the technical problems of high cost, long period, and the like in the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention provides a deblocking assembly, a packer with the deblocking assembly and a deblocking method, wherein the deblocking assembly comprises elastic clamping jaws and clamping jaw support rings; the elastic clamping jaws comprise mounting pipes and a plurality of elastic clamping hooks vertically arranged at the lower ends of the mounting pipes, a slideway matched with the clamping jaw supporting rings is enclosed between the elastic clamping hooks, and each elastic clamping hook comprises an elastic supporting rod arranged at the lower end of the mounting pipe and a convex block arranged on the outer side wall of the lower end of the elastic supporting rod; the clamping jaw support ring is arranged in a slide way enclosed between the elastic clamping hooks and is connected with the lower ends of the elastic clamping hooks through a first shearing pin

Preferably: the packer comprises a central pipe and a slip assembly, wherein an upper push cylinder, a rubber cylinder assembly and a lower push cylinder are sequentially sleeved on the outer side wall of the central pipe from top to bottom; the slip assembly comprises an upper cone, a lower cone, a slip frame, a slip and a spring; the upper cone is sleeved on the central tube, and the upper end of the upper cone is connected with the lower end of the lower push cylinder through threads; the lower cone is sleeved at the lower end of the central tube; the upper end of the slip frame is fixed on the upper cone, the lower end of the slip frame is sleeved on the outer side wall of the lower cone, the slip and the spring are arranged between the upper cone and the lower cone, a slip hole for the slip to leak is formed in the slip frame, and the lower end of the central tube is connected with the installation tube in a threaded sealing mode.

Preferably: the outer wall of the mounting pipe is provided with a lower boss, and the inner wall of the lower cone is provided with an upper boss; the rubber cylinder component comprises an upper rubber cylinder, a middle pushing cylinder and a lower rubber cylinder which are sequentially sleeved on the central pipe from top to bottom.

Preferably: the side wall of the central tube is provided with a one-way valve which can flow in one way from outside to inside, the middle push cylinder is provided with a chute, and the one-way valve is positioned in the chute; the one-way valve comprises a valve body, a sealing plug and a return spring; the valve body is provided with a channel for communicating the outside and the inside of the central tube in a penetrating way; the sealing plug and the return spring are both arranged on the valve body; the return spring enables the sealing plug to seal the passage; when the gas is lifted, the air pressure outside the central tube pushes the sealing plug to open the channel.

Preferably: the packer also comprises a locking ring, wherein small inner teeth which are obliquely arranged upwards are arranged on the inner wall of the locking ring, and small outer teeth which are matched with the small inner teeth and are obliquely inclined downwards are arranged on the outer wall of the central tube; the outer wall of the locking ring is provided with large outer teeth with the size larger than that of the small inner teeth, and the inner wall of the push-up barrel is provided with large inner teeth matched with the large outer teeth.

Preferably: the upper end of the upper pushing cylinder is connected with a setting sleeve, the upper end of the central tube is connected with an upper joint, the lower end of the lower cone is connected with a lower joint, and second shearing pins are arranged between the upper pushing cylinder and the central tube and between the lower pushing cylinder and the central tube.

Preferably: the deblocking method comprises the following three steps:

s1, shearing the first shear pin: pushing the jaw support ring upwards by external force, and shearing the first shearing pin by the jaw support ring;

s2, separating the elastic claw from the lower cone: the clamping jaw support ring shears the first shearing pin and then moves upwards to the installation pipe along the slideway, pushes the installation pipe to move upwards, and drives the elastic clamping jaw to be separated from the lower cone when the installation pipe moves upwards;

s3, slip unsealing and resetting: when the installation pipe shifts up, drive the center tube and shift up, the center tube shifts up through pushing down the ejector pad promotion, and it shifts up to go up the ejector pad and drive down pushing cylinder, last cone, slips frame in proper order to go up the ejector pad, and spring and slips reset simultaneously to realize the deblocking.

Compared with the prior art, the invention has the beneficial effects that: packer deblocking subassembly: the elastic clamping jaws comprise mounting pipes and elastic clamping hooks, a slide way is enclosed between the elastic clamping hooks, the clamping jaw support ring is arranged in the slide way, and the clamping jaw support ring is connected with the lower ends of the elastic clamping hooks through first shearing pins; a packer: the center tube has cup jointed push-up cylinder, packing element subassembly and lower push-down cylinder, and the slips subassembly includes cone, lower cone, slips frame, slips and spring, and the center tube lower extreme passes through screw thread sealing connection with the installation pipe, and elasticity pothook hook is equipped with the ejector pad on the cone down on the push-down cylinder inner wall, is equipped with down the ejector pad on the outer wall of center tube. The packer unsealing method comprises the following steps: shearing the first shearing pin; the elastic claw is separated from the lower cone; the slips are unsealed and reset; the invention can effectively solve the technical problems of higher cost, longer period and the like in the prior art.

Drawings

FIG. 1 is a schematic illustration of the construction of the packer unsetting assembly of the present invention;

FIG. 2 is a schematic view of the lower half of the isolated gas lift packer of the present invention;

FIG. 3 is an enlarged partial schematic view at C of FIG. 2;

FIG. 4 is a schematic diagram of the upper half of the isolated gas lift packer of the present invention;

FIG. 5 is an enlarged partial schematic view at A of FIG. 4;

FIG. 6 is an enlarged partial schematic view at B in FIG. 4;

FIG. 7 is a schematic diagram of the configuration of an isolated gas lift packer of the present invention set in a gas well;

FIG. 8 is a schematic diagram of the deblocking tool;

FIG. 9 is a schematic view of the structure of the assembly portion when the unset tool unsets the packer.

In the figure, 1 is a setting sleeve, 2 is an upper joint, 4 is a locking ring, 402 is a small tooth group, 405 is a large tooth group, 5 is a connecting cylinder, 6 is a first shearing pin, 7 is an upper pressing cylinder, 8 is a side rubber cylinder, 9 is an upper core pipe, 10 is a middle rubber cylinder, 11 is a middle pressing cylinder, 111 is a sliding chute, 12 is a one-way valve, 121 is a valve body, 122 is a return spring, 123 is a sealing plug, 124 is a channel, 125 is a threaded sleeve, 14 is a long pushing cylinder, 15 is a first long core pipe, 16 is a second long core pipe, 17 is a lower pushing cylinder, 171 is an upper pushing block, 18 is an upper cone, 19 is a slip holder, 20 is a slip, 21 is a spring, 221 is an upper boss, 22 is a lower cone, 23 is a lower core pipe, 231 is a lower pushing block, 24 is a lower key, 25 is a guide ring, 26 is an elastic claw, 261 is an installation pipe, 262 is an elastic supporting rod, 263 is a lug, 264 is a lower boss, 264 is a lower claw, 27 is a first supporting ring pin, 28 is a first supporting ring, 29 is a lower joint, 001 is a central pipe, 002 is an oil pipe, 003 is a sleeve, 004 is a permanent packer, 006 is an ejection air hole, 008 is a supporting spring, 009 is an extrusion telescopic claw, 010 is a supporting block, 011 is a central rod and 012 is an end head.

Detailed Description

The invention is further explained below with reference to the drawings and the specific embodiments.

The first embodiment is as follows:

referring to fig. 1, the packer unsetting assembly comprises elastic jaws 26 and jaw support rings 27; the elastic claw 26 comprises a mounting pipe 261 and a plurality of elastic hooks vertically arranged at the lower end of the mounting pipe 261; a slideway matched with the claw support ring 27 is enclosed between the elastic hooks; the jaw support ring 27 is arranged in a slideway enclosed between the elastic hooks; in the setting state, the jaw support ring 27 is connected with the lower end of the elastic hook through a first shearing pin 28; the elastic hook can adopt the existing structure, as long as the elastic hook can hook the lower cone 22, and the claw support ring 27 can fix the elastic hook on the lower cone 22, which are all within the scope of the invention as a modified proposal: the elastic hook is composed of an elastic rod 262 disposed at the lower end of the mounting tube 261 and a protrusion 263 disposed on the outer side wall of the lower end of the elastic rod 262.

Example two:

referring to fig. 1-6, a packer configured with the packer unsetting assembly of an embodiment includes a base pipe 001 and a slip assembly; the outer side wall of the central tube 001 is sequentially sleeved with an upper pushing cylinder, a rubber cylinder component and a lower pushing cylinder 17 from top to bottom. The lower end of the central pipe 001 is connected with the mounting pipe 261 in a threaded sealing mode.

Referring to fig. 2 and 3, the slip assembly includes an upper cone 18, a lower cone 22, a slip frame 19, slips 20, and a spring 21; the upper cone 18 is sleeved on the central tube, and the upper end of the upper cone 18 is connected with the lower end of the lower push cylinder 17 through threads; the lower cone 22 is sleeved at the lower end of the central tube; the upper end of the slip frame 19 is fixed on the upper cone 18, and the lower end is sleeved on the outer side wall of the lower cone 22; slips 20 and a spring 21 are arranged between the upper cone 18 and the lower cone 22, and a slip hole for leaking the slips 20 is formed on the slip frame 19. When setting, the lower cone 18 and the upper cone 22 approach each other, the spring 21 is compressed, and the slips 20 are pushed outward and stuck to the inner wall of the tubing through the slip holes.

In a setting state, the elastic clamping hook is hooked on the lower end surface or the clamping groove of the lower cone 22, and the clamping claw support ring 27 limits the elastic clamping hook on the position where the lower end surface, the clamping groove or the boss on the inner side wall of the lower cone 22 and the like can be clamped; the elastic catch is limited by a catch support ring 27 in fig. 3 on the lower end face of the lower cone 22.

Referring to fig. 2, the inner wall of the lower push cylinder 17 is provided with an upper push block 171, and the outer wall of the central tube is provided with a lower push block 231 for pushing the upper push block 171 upwards during unsealing.

Referring to fig. 2, as a further preferred solution: the outer wall of the lower cone 22 is sleeved with a guide ring 25. The slip assembly further includes a lower key 24, the lower key 24 being disposed on the base pipe, and the upper cone 18 and the lower cone 22 each being slidably disposed on the lower key 24.

Referring to fig. 2 and 4, as a further preferred solution: the upper end of the upper pushing cylinder is connected with a setting sleeve, the upper end of the central tube is connected with an upper joint, and the lower end of the lower cone 22 is connected with a lower joint. The upward pushing cylinder consists of a connecting cylinder 5 and an upper pressing cylinder 7, and the setting sleeve 1, the connecting cylinder 5 and the upper pressing cylinder 7 are sequentially connected through threads from top to bottom; the lower end of the upper pressing cylinder 7 is abutted against the upper end of the rubber cylinder component.

Referring to fig. 1 and 2, as a further preferred solution: be equipped with down boss 264 on the outer wall of installation pipe 261, be equipped with boss 221 on the lower cone 22 inner wall, during the deblocking, installation pipe 261 drives through boss 264 down and goes up boss 221 and take lower cone 22 away from the oil gas well.

Example three:

referring to fig. 1 to 6, on the basis of the second embodiment, as an improved scheme: the rubber cylinder component comprises an upper rubber cylinder, a middle pushing cylinder and a lower rubber cylinder which are sequentially sleeved on the central pipe from top to bottom. The middle push cylinder is composed of a middle pressure cylinder 11 and a long push cylinder 14 which are connected through threads; the upper end of the medium-pressure barrel 11 abuts against the lower end of the upper rubber barrel, and the lower end of the long push barrel 14 abuts against the upper end of the lower rubber barrel. The upper end of the lower push cylinder 17 is abutted against the lower end of the lower rubber cylinder, and the lower end of the upper press cylinder 17 is connected with the slip assembly. Second shear pins 6 are arranged between the upper pushing cylinder and the central tube and between the lower cone 22 and the central tube.

Referring to fig. 4 and 6, a one-way valve 12 which flows in one way from outside to inside is arranged on the side wall of the central tube, a sliding groove 111 is arranged on the middle push tube, the one-way valve 12 is located in the sliding groove 111, and during setting, the one-way valve 12 moves relative to the sliding groove 111. The check valve 12 includes a valve body 121, a return spring 122, and a sealing plug 123. The valve body 121 is provided with a passage 124 communicating the outside and the inside of the central tube. The sealing plug 123 and the return spring 122 are both arranged on the valve body 121; the return spring 122 causes the sealing plug 123 to seal off the passage 124; when the gas is lifted, the air pressure outside the central tube pushes the sealing plug 123 to open the passage 124.

Referring to fig. 2 and 4, as a further preferred solution: go up the packing element and constitute by two limit glues 8 and the well packing element 10 that sets up between two limit packing elements 8 with lower packing element, well packing element 10 and two limit packing elements 8 all overlap and establish on the lateral wall of center tube.

Referring to fig. 4 and 5, as a further preferred solution: the packer further comprises a locking ring 4, small inner teeth which are arranged in an upward inclined mode are arranged on the inner wall of the locking ring 4, small outer teeth which are matched with the small inner teeth and are arranged in a downward inclined mode are arranged on the outer wall of the central tube, and the small inner teeth and the small outer teeth form a small tooth group 402. The outer wall of the lock ring is provided with large outer teeth with the size larger than that of the small inner teeth, the inner wall of the push-up barrel is provided with large inner teeth matched with the large outer teeth, and the large inner teeth and the large outer teeth form a large tooth group 405. When setting, the upward pushing cylinder drives the locking ring to move downwards relative to the central tube through the large outer teeth and the large inner teeth, and meanwhile, the small inner teeth of the locking ring slide downwards relative to the small outer teeth of the central tube.

As a further preferred solution, with reference to fig. 1 to 6: the central tube is formed by splicing an upper joint 2, an upper core tube 9, a first long core tube 15, a second long core tube 16 and a lower core tube 23 which are sequentially connected from top to bottom. The lower end of the upper joint 2 is sleeved at the upper end of the upper core pipe 9 through threads; the upper core tube 9 and the first long core tube 15 are connected through a threaded sleeve 125; the lower end of the first long core pipe 15 is inserted into the upper end of the second long core pipe 16 through threads; the lower end of the second long core pipe 16 is inserted in the upper end of the lower core pipe 23 through threads; the lower end of the lower core tube 23 is screwed to the mounting tube 261. The small external teeth of the central tube are arranged on the upper joint 2. A first shear pin 6 between the center tube and the connecting cylinder 5 is provided on the upper joint 2, and a first shear pin 6 between the center tube and the lower cone 22 is provided on the lower core tube 23. The upper rubber sleeve is sleeved on the upper core tube 9, and the lower rubber sleeve is sleeved on the second long core tube 16. The valve body 121 is connected with a connecting sleeve 125, the connecting sleeve 125 is sleeved on the joint of the upper core tube 9 and the first long core tube 15 in a sealing manner through threads, a gap is reserved at the joint of the upper core tube 9 and the first long core tube 15, and the channel 124 penetrates through the connecting sleeve 125 to be communicated with the gap. The lower push block 231 is provided at the upper end of the lower core tube 23. The outer side wall of the lower end of the lower cone 22 is connected with a lower joint 29 through threads. The side wall of the installation pipe 261 is provided with a lower boss 264, the lower boss 264 and an upper boss 221 on the inner wall of the lower cone 22, and when unsealing is performed, the installation pipe 261 carries the lower cone 22 and the lower joint 29 away from the oil pipe through the lower boss 264 and the upper boss 221.

Referring to fig. 7, the present invention may adopt the technical solution of this embodiment to perform gas lift to drain accumulated water. The invention is suitable for the oil-gas well with a permanent packer 004 between the oil pipe 002 and the casing pipe 003. Before setting, a perforation tool is adopted to eject the air hole 006 on the oil pipe 002, the air hole 006 is positioned above the permanent packer 004, then the packer in the invention is set, the air hole 006 is positioned between two rubber sleeve assemblies, after setting is finished, high-pressure gas is injected into an annular cavity between the oil pipe 002 and the sleeve 003, the high-pressure gas sequentially penetrates through the air hole 006, an annular space between the central pipe 001 and the oil pipe 002 and the check valve 12 to enter the central pipe 001, and then the high-pressure gas ejects water in the oil pipe 002.

By adopting the technical scheme of the embodiment, well repair is not needed, the packer disclosed by the invention is put into the oil pipe through perforating on the oil pipe and is set, and the water column in the oil pipe can be ejected by adopting a gas lift process; compared with the existing drainage process, the gas lift process can be completed without repairing the well first, the cost is lower, and the time period is short. And the packer need not to take out, can used repeatedly, influences oil gas exploitation when ponding, alright in order to adopt the gas lift technology to drain water.

Example four:

referring to fig. 1 to 3, the method for unsetting a packer according to the above embodiment includes the following steps:

s1, shearing the first shear pin 28: the jaw support ring 27 is pushed upwards with an external force, the jaw support ring 27 shearing off the first shear pin 28.

S2, the elastic claw disengages from the lower cone 22: after the claw support ring 27 shears the first shearing pin 28, the first shearing pin moves upwards to the installation pipe 261 along the slideway enclosed between the elastic clamping hooks, and pushes the installation pipe 261 to move upwards, so that the elastic claws are driven to be separated from the lower cone 22 when the installation pipe 261 moves upwards.

S3, slip unsealing and resetting: when the installation pipe 261 moves upwards, the central pipe is driven to move upwards, the central pipe pushes the upper pushing block 171 to move upwards through the lower pushing block 231, the upper pushing block 171 sequentially drives the lower pushing cylinder 17, the upper cone 18 and the slip frame 19 to move upwards, and meanwhile, the spring 21 and the slip 20 reset, so that the unsealing is realized.

Referring to fig. 8 and 9, in the deblocking process of the deblocking tool used for deblocking the packer, firstly, the center rod 011 drives the end head 012 and the supporting block 010 to pass through the claw supporting ring 27 from top to bottom, the telescopic claws 009 are blocked by the claw supporting ring 27, the supporting spring 008 is compressed along with the downward movement of the center rod 011 until the pressure of the supporting spring 008 increases to a certain extent, the claw supporting ring 27 extrudes the telescopic claws 009 to approach the center rod 011 and pass through the claw supporting ring 27, the telescopic claws 009 pass through the claw supporting ring 27 and then expand again, and the supporting spring 008 pushes the telescopic claws 009 to abut against the supporting block 010 again; then, the center rod 011 is lifted up, the telescopic claws 009 are always in the open state under the action of the supporting block 010, and the claw supporting ring 27 is pushed upwards. The packer is then unset according to the steps S1-S3.

In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. An decapsulation assembly, comprising: the assembly comprises resilient jaws (26) and jaw support rings (27); the elastic clamping jaws (26) comprise mounting pipes (261) and a plurality of elastic clamping hooks vertically arranged at the lower ends of the mounting pipes (261), slide ways matched with the clamping jaw supporting rings (27) are enclosed among the elastic clamping hooks, and each elastic clamping hook comprises an elastic supporting rod (262) arranged at the lower end of the mounting pipe (261) and a convex block (263) arranged on the outer side wall of the lower end of the elastic supporting rod (262); the jaw support ring (27) is arranged in a slide way enclosed between the elastic hooks and is connected with the lower ends of the elastic hooks through a first shearing pin (28).

2. The packer of claim 1, wherein: the packer comprises a central pipe (001) and a slip assembly, wherein an upper push cylinder, a rubber cylinder assembly and a lower push cylinder (17) are sequentially sleeved on the outer side wall of the central pipe (001) from top to bottom; the slip assembly comprises an upper cone (18), a lower cone (22), a slip frame (19), slips (20) and a spring (21); the upper cone (18) is sleeved on the central tube (001), and the upper end of the upper cone (18) is connected with the lower end of the lower push cylinder (17) through threads; the lower cone (22) is sleeved at the lower end of the central tube (001); the slip rack is characterized in that the upper end of the slip rack (19) is fixed on the upper cone (18), the lower end of the slip rack is sleeved on the outer side wall of the lower cone (22), the slip (20) and the spring (21) are arranged between the upper cone (18) and the lower cone (22), a slip hole for the slip (20) to leak is formed in the slip rack (19), and the lower end of the central pipe (001) is connected with the installation pipe (261) in a sealing mode through threads.

3. A packer having a deblocking assembly as claimed in claim 2, wherein: a lower boss (264) is arranged on the outer wall of the mounting pipe (261), and an upper boss (221) is arranged on the inner wall of the lower cone (22); the packing element subassembly includes from the top down cup joints last packing element, well pushing cylinder and the packing element down on center tube (001) in proper order.

4. A packer having a deblocking assembly as claimed in claim 3, wherein: the side wall of the central tube (001) is provided with a one-way valve (12) which flows in one way from outside to inside, the middle push cylinder is provided with a chute (111), and the one-way valve (12) is positioned in the chute (111); the one-way valve (12) comprises a valve body (121), a sealing plug (123) and a return spring (122); the valve body (121) is provided with a channel (124) which communicates the outside and the inside of the central tube (001) in a penetrating way; the sealing plug (123) and the return spring (122) are both arranged on the valve body (121); the return spring (122) enables the sealing plug (123) to seal the channel (124); when the gas is lifted, the air pressure outside the central tube (001) pushes the sealing plug (123) to open the channel (124).

5. A packer having a deblocking assembly as claimed in claim 2, wherein: the packer also comprises a locking ring (4), wherein small inner teeth which are obliquely arranged upwards are arranged on the inner wall of the locking ring, and small outer teeth which are matched with the small inner teeth and are obliquely inclined downwards are arranged on the outer wall of the central tube (001); the outer wall of the locking ring (4) is provided with large external teeth with the size larger than that of the small internal teeth, and the inner wall of the push-up barrel is provided with large internal teeth matched with the large external teeth.

6. A packer having a deblocking assembly as claimed in claim 2, wherein: the upper end of the upper pushing cylinder is connected with a setting sleeve (1), the upper end of the central tube (001) is connected with an upper joint (2), the lower end of the lower cone (22) is connected with a lower joint, and second shearing pins (6) are arranged between the upper pushing cylinder and the central tube (001) and between the lower pushing cylinder (17) and the central tube (001).

7. The method of unsetting a packer having an unsetting assembly according to any of claims 2-6, further comprising: the deblocking method comprises the following three steps:

s1, shearing the first shear pin (28): pushing the jaw supporting ring (27) upwards by external force, wherein the jaw supporting ring (27) shears the first shearing pin (28);

s2, the elastic claw (26) is separated from the lower cone (22): the claw support ring (27) shears the first shearing pin (28), moves upwards to the installation pipe (261) along the slideway, pushes the installation pipe (261) to move upwards, and drives the elastic claws (26) to be separated from the lower cone (22) when the installation pipe (261) moves upwards;

s3, unlocking and resetting the slips (20): when the installation pipe (261) moves upwards, the central pipe (001) is driven to move upwards, the central pipe (001) pushes the upper pushing block to move upwards through the lower pushing block, the upper pushing block sequentially drives the lower pushing cylinder (17), the upper cone (18) and the slip frame (19) to move upwards, and meanwhile the spring (21) and the slip (20) reset, so that deblocking is achieved;

an upper push block (171) is arranged on the inner wall of the lower push cylinder (17), and a lower push block (231) used for pushing the upper push block (171) upwards during deblocking is arranged on the outer wall of the central tube.