An energy storage injection packer and method of use

Abstract

The application provides an energy storage injection and production packer, which comprises an inner tube, a first assembly, a second compression sleeve, a slip, a third compression sleeve and a second assembly which are sequentially sleeved on the outer wall of the inner tube and are connected at the first ends and the second ends, the third compression sleeve is sleeved at the first end of the second assembly through a second sliding groove and a second protrusion, the outer wall of the inner tube is further sleeved with a second reverse stopping part and a third reverse stopping part, the inner wall of the third compression sleeve is provided with an annular groove, a middle annular block is arranged in the annular groove, and the middle annular block is kept at a distance from the third reverse stopping part. The second compression sleeve and the third compression sleeve are driven in the inner cavity of the wellbore, the slip is simultaneously extruded from both ends, the slip is not interfered and is mutually assisted, the slip is expanded to form anchoring with the inner wall of the wellbore, the stability of the synchronous expansion deformation of the two ends of the slip is ensured, the slip is quickly released through the cutting method of the inner tube, and the operation demand of the overall quick recovery of the packer is met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy storage packer, and particularly relates to an energy storage injection-production packer and a use method. BACKGROUND

[0002] In the operation process of the air energy storage system, the injection-production packer needs to have excellent sealing performance, pressure resistance and pressure bearing capacity to ensure the safe operation of the gas storage and the efficient storage of energy. At the same time, compressed air energy storage is a system that needs to be maintained and operated for a long time, and the service life is more than 20 years. As a key component, the super-large diameter injection-production packer plays a key role in the service life of the entire system. In particular, the size specifications required by compressed air energy storage are far beyond those of conventional injection-production packers, and higher requirements are put forward for the stability of the super-large diameter injection-production packer.

[0003] The difficulty of recycling the super-large diameter injection-production packer has always been a difficulty in the industry. Especially after the packer fails, it cannot be effectively recycled, which will directly affect the subsequent use of the gas storage and the air energy storage system. Especially in the face of complex application environment, the current common super-large diameter injection-production packer adopts a single plugging structure and does not have a releasing function, which leads to the problems of poor stability and ineffective recycling of the packer.

[0004] Therefore, overcoming the defects of the prior art is an urgent problem to be solved in the technical field. SUMMARY

[0005] In view of the above problems, the present application provides an energy storage injection-production packer, which comprises an inner tube and a first assembly, a second compression sleeve, a slip, a third compression sleeve and a second assembly which are sequentially sleeved on the outer wall of the inner tube and are butted at the first and second ends; the first assembly and the second assembly are fixedly sleeved with the inner tube;

[0006] The tail end of the third compression sleeve is slidably sleeved with the head end of the second assembly, the side wall of the head end of the second assembly is provided with an axially extending second sliding groove, the tail end side wall of the third compression sleeve is provided with a second protrusion which is slidably connected with the second sliding groove, and the side wall of the inner tube is provided with a through hole which is in communication with the compression inner cavities of the second compression sleeve and the third compression sleeve;

[0007] The hydraulic medium is injected into the compression inner cavities of the second compression sleeve and the third compression sleeve to drive the output ends of the second compression sleeve and the third compression sleeve to extrude the head and tail ends of the slip, so that the slip is in a working state of expanding at both ends, and the outer wall of the inner tube is further sleeved with a second non-return component and a third non-return component for blocking the reset of the output end of the second compression sleeve and the reset of the output end of the third compression sleeve;

[0008] The third compression sleeve set is provided with a ring groove for accommodating the third reverse stopping component, and the inner tube is provided with a middle annular block in the inner cavity of the ring groove. The tail end of the middle annular block faces the third reverse stopping component and is kept a predetermined distance from the third reverse stopping component. When the inner tube side wall between the tail end of the middle annular block and the third reverse stopping component is cut, the third compression sleeve set, the lower half of the inner tube and the second assembly are lowered until the ring groove inner wall and the head end of the middle annular block abut, so that the slipper returns to the initial state from the working state.

[0009] Further, the first assembly comprises an inner sleeve assembly, a first sealing rubber sleeve and a first compression sleeve, which are sequentially sleeved on the outer wall of the inner tube and abut at the head and tail ends.

[0010] The first compression sleeve output end is driven to extrude the first sealing rubber sleeve to move to one side of the inner sleeve assembly, so that the first sealing rubber sleeve is deformed to the working state. The outer wall of the inner tube is sleeved with a first reverse stopping component for blocking the reset of the first compression sleeve output end.

[0011] The second assembly comprises a fourth compression sleeve, a second sealing rubber sleeve and a lower unsealing assembly, which are sequentially sleeved on the outer wall of the inner tube and abut at the head and tail ends.

[0012] The fourth compression sleeve output end is driven to extrude the second sealing rubber sleeve to move to one side of the lower unsealing assembly, so that the second sealing rubber sleeve is deformed to the working state. The outer wall of the inner tube is sleeved with a fourth reverse stopping component for blocking the reset of the fourth compression sleeve output end.

[0013] Further, the lower unsealing assembly comprises an unsealing sleeve, an annular outer protrusion on the outer wall of the inner tube, and a second pin member.

[0014] The shearing force required for cutting the second pin member is greater than the deformation force of the second sealing rubber sleeve in the working state.

[0015] Further, the inner sleeve assembly comprises a sleeve and a guide sleeve.

[0016] The inner wall of the sleeve is fixedly sleeved with the outer wall of the inner tube, the outer wall of the sleeve is slidably sleeved with the inner wall of the guide sleeve, and the guide sleeve and the sleeve are connected by a first pin member. The guide sleeve is provided with a first sliding groove extending in the axial direction on the side wall, and the outer wall of the sleeve is provided with a first protrusion slidably sleeved with the first sliding groove. The inner wall of the end of the first sliding groove away from the first sealing rubber sleeve is kept a predetermined distance from the first protrusion, and the tail end of the guide sleeve abuts against the head end of the first sealing rubber sleeve.

[0017] The shearing force required for cutting off the first pin member is greater than the deformation force of the first rubber sealing tube in the working state.

[0018] Further, the inner tube comprises, in sequence from the head end to the tail end, a coupling, an upper central pipe, an upper locking pipe, a lower locking pipe, and a lower central pipe.

[0019] The outer wall of the upper central pipe is sleeved with an inner bushing assembly, a first rubber sealing tube, and a first compression sleeve;

[0020] The outer wall of the upper locking pipe is sleeved with a second compression sleeve and a slip;

[0021] The outer wall of the lower locking pipe is sleeved with a third compression sleeve;

[0022] The outer wall of the lower central pipe is sleeved with a fourth compression sleeve, a second rubber sealing tube, and a lower unsealing assembly.

[0023] Further, the outer wall of the tail end of the upper central pipe is threadedly sleeved with the inner wall of the head end of the upper locking pipe, and the first compression sleeve comprises, in sequence from the outer wall of the inner tube, an upper thrust ring, an upper rubber sealing tube locking ring, a first hydraulic cylinder, and a first piston.

[0024] The head end of the upper thrust ring is sleeved with the outer wall of the upper central pipe, the head end of the upper thrust ring is in abutment with the first composite rubber sealing tube, the tail end inner wall of the upper thrust ring is threadedly sleeved with the outer wall of the head end of the first hydraulic cylinder, and the tail end inner wall of the first hydraulic cylinder is sealingly sleeved with the outer wall of the head end of the upper locking pipe.

[0025] The tail end inner wall of the first hydraulic cylinder is also sealingly sleeved with the first piston arranged at a distance from the head end of the upper locking pipe, the inner wall of the first piston is sealingly sleeved with the outer wall of the upper central pipe, the tail end wall of the first piston, the head end wall of the upper locking pipe, the tail end inner wall of the first hydraulic cylinder, and the outer wall of the upper central pipe form a compression inner cavity of the first compression sleeve, and a first through hole is formed in the side wall of the inner tube and is in communication with the compression inner cavity of the first compression sleeve.

[0026] The first reverse prevention component is the upper rubber sealing tube locking ring, the inner wall of the upper rubber sealing tube locking ring is threadedly sleeved with the outer wall of the upper central pipe through a one-way sawtooth thread, and the outer wall of the upper rubber sealing tube locking ring is threadedly sleeved with the tail end inner wall of the upper thrust ring through a one-way sawtooth thread.

[0027] Further, the second compression sleeve comprises, in sequence from the outer wall of the inner tube, a second hydraulic cylinder, a second piston, an upper slip locking ring, and an upper cone.

[0028] The inner wall of the first end part of the secondary hydraulic cylinder is sealingly sleeved with the outer wall of the upper locking pipe, the first end part of the secondary hydraulic cylinder is abutted with the tail end of the first compression sleeve set, the inner wall of the tail end part of the secondary hydraulic cylinder is sealingly sleeved with the outer wall of the first end part of the secondary piston, the inner wall of the first end part of the secondary piston is sealingly sleeved with the outer wall of the upper locking pipe, the first end part of the secondary piston is arranged in a spaced manner with the tail end part of the secondary hydraulic cylinder, the inner wall of the tail end part of the secondary hydraulic cylinder, the end wall of the first end part of the secondary piston and the outer wall of the upper locking pipe jointly form a compression inner cavity of the second compression sleeve set, and the second through hole is formed in the side wall of the inner pipe and is in communication with the compression inner cavity of the second compression sleeve set;

[0029] The inner wall of the first end part of the secondary piston is sleeved with the outer wall of the upper locking pipe, the inner wall of the tail end part of the secondary piston is threadedly sleeved with the outer wall of the first end part of the upper cone, the inner wall of the upper cone is sleeved with the outer wall of the upper locking pipe, and the tail end part of the upper cone is abutted with the inner tapered surface of the first end part of the slip.

[0030] The second reverse stopping part is the upper slip locking ring, the inner wall of the tail end part of the secondary piston is further threadedly sleeved with the outer wall of the upper slip locking ring through the one-way sawtooth thread, the inner wall of the upper slip locking ring is threadedly sleeved with the outer wall of the upper locking pipe through the one-way sawtooth thread, and the outer wall of the upper slip locking ring is threadedly sleeved with the inner wall of the tail end part of the secondary piston through the one-way sawtooth thread and is arranged in a spaced manner with the first end part of the upper cone.

[0031] Further, the middle annular block is a connecting sleeve, the inner walls of the first end part and the tail end part of the connecting sleeve are respectively threadedly sealingly sleeved with the outer wall of the tail end part of the upper locking pipe and the outer wall of the first end part of the lower locking pipe, the third compression sleeve set comprises a lower cone, a tertiary piston, a lower slip locking ring and a tertiary hydraulic cylinder which are sequentially sleeved with the outer wall of the inner pipe, and the lower slip locking ring is a third reverse stopping part;

[0032] The lower cone is sleeved with the outer wall of the upper locking pipe, the first end part of the lower cone is abutted with the inner tapered surface of the tail end part of the slip, the outer wall of the tail end part of the lower cone is threadedly sleeved with the inner wall of the first end part of the tertiary piston, the inner wall of the first end part of the tertiary piston is provided with an annular groove for accommodating the connecting sleeve and the lower slip locking ring, the lower slip locking ring and the lower cone are respectively located on two sides of the connecting sleeve and are both spaced by a predetermined distance, the inner wall of the lower slip locking ring is threadedly sleeved with the outer wall of the lower locking pipe through the one-way sawtooth thread, and the outer wall of the lower slip locking ring is threadedly sleeved with the inner wall of the annular groove of the tertiary piston through the one-way sawtooth thread.

[0033] The inner wall of the tail end part of the tertiary piston is sealingly sleeved with the outer wall of the lower locking pipe, the outer wall of the tail end part of the tertiary piston is sealingly sleeved with the inner wall of the first end part of the tertiary hydraulic cylinder, the inner wall of the tail end part of the tertiary hydraulic cylinder is sealingly sleeved with the outer wall of the lower locking pipe, the tail end part of the tertiary piston is arranged in a spaced manner with the tail end part of the tertiary hydraulic cylinder, the tail end of the tertiary hydraulic cylinder is abutted with the first end part of the third compression sleeve set, the inner wall of the first end part of the tertiary hydraulic cylinder, the end wall of the tail end part of the tertiary piston and the outer wall of the lower locking pipe jointly form a compression inner cavity of the third compression sleeve set, and the third through hole is formed in the side wall of the inner pipe and is in communication with the compression inner cavity of the third compression sleeve set.

[0034] The side wall of the first end of the third hydraulic cylinder is provided with an axially extending second sliding groove, and the outer wall of the tail end of the third piston is provided with a second protrusion in sliding connection with the second sliding groove.

[0035] The side wall of the tail end of the third hydraulic cylinder is provided with an axially extending third sliding groove, and the outer wall of the tail end of the lower locking pipe is provided with a third protrusion in sliding connection with the third sliding groove.

[0036] Further, the inner wall of the tail end of the lower locking pipe is threadedly and sealingly connected to the outer wall of the tail end of the lower central pipe, and the fourth compression set includes a fourth-stage piston, a fourth-stage hydraulic cylinder, a lower rubber sleeve locking ring, and a lower thrust ring, which are sequentially sleeved on the outer wall of the inner pipe.

[0037] The inner wall of the tail end of the fourth-stage hydraulic cylinder sealingly sleeves the outer wall of the tail end of the lower locking pipe, and the inner wall of the tail end of the fourth-stage hydraulic cylinder also sealingly sleeves the outer wall of the fourth-stage piston.

[0038] The outer wall of the tail end of the fourth-stage hydraulic cylinder threadedly sleeves the inner wall of the tail end of the lower thrust ring, and the inner wall of the tail end of the lower thrust ring sleeves the outer wall of the lower central pipe.

[0039] The fourth reverse stopping component is a lower rubber sleeve locking ring, the inner wall of the lower rubber sleeve locking ring is threadedly sleeved on the outer wall of the central pipe through a one-way sawtooth thread, and the outer wall of the lower rubber sleeve locking ring is threadedly sleeved on the inner wall of the tail end of the lower thrust ring through a one-way sawtooth thread.

[0040] Further, the rubber sleeve has a cylindrical structure, and the outer walls of both ends of the rubber sleeve are axially arrayed with a plurality of annular clamping teeth.

[0041] A use method of the energy storage injection and production packer based on the above, further comprising an injection and production pipe, a sitting joint pipe, a shear ball sleeve pipe, and a guide lead pipe, and the shear ball sleeve pipe is internally sleeved with a sealing sliding sleeve.

[0042] The tail end of the injection and production pipe, the packer, the sitting joint pipe, the shear ball sleeve pipe, and the guide lead pipe are sequentially and sealingly threadedly sleeved to form an integrated device, and the integrated device is lowered into the inner cavity of the wellbore.

[0043] The steel ball matched with the sealing sliding sleeve is put into the shear ball sleeve pipe to realize the shear ball sleeve pipe cavity sealing, hydraulic medium is injected into the cavity of the whole device, and pressure is applied, so that the hydraulic medium enters the compression cavities of the second compression sleeve and the third compression sleeve, the output end of the second compression sleeve and the third compression sleeve is extruded to drive the slip, and the anchoring operation is completed;

[0044] The pressure continues to be increased until the steel ball and the sealing sliding sleeve built in the shear ball seat fall to the bottom of the well, and the installation operation of the whole device in the cavity of the well is completed;

[0045] When the whole device needs to be recovered, the cutting tool is lowered to cut the inner tube sidewall between the middle annular block tail end and the reverse component, and the slip anchoring operation is released;

[0046] The whole device is lifted to complete the recovery operation.

[0047] Compared with the prior art, the embodiments of the present application have at least the following advantages:

[0048] The energy storage injection and production packer and the use method have the following advantages:

[0049] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be learned from the practice of the present application. The purposes and other advantages of the present application can be achieved and obtained by the structure indicated in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0051] Figure 1 The schematic diagram of the energy storage injection and production packer in the embodiment of the present application is shown Figure One ;

[0052] Figure 2 The schematic diagram of the energy storage injection and production packer in the embodiment of the present application is shown Figure Two ;

[0053] Figure 3 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown Figure One ;

[0054] Figure 4 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown Figure Two ;

[0055] Figure 5 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown Figure Three ;

[0056] Figure 6 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown Figure Four ;

[0057] Figure 7 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown Figure Five ;

[0058] Figure 8 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown

[0059] Figure 9 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown

[0060] Figure 10 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown

[0061] Figure 11 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown

[0062] Figure 12 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown

[0063] Figure 13 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown Figure One ;

[0064] Figure 14 A partial enlarged view of the energy storage injection production packer in the embodiment of the present application is shown Figure Two .

[0065] In the figure, 1, inner tube; 101, coupling; 102, upper central tube; 103, upper locking tube; 104, lower locking tube; 105, lower central tube; 2, inner bushing assembly; 201, bushing; 202, guide sleeve; 203, first bolt; 204, first sliding groove; 205, first protrusion; 3, first rubber sealing cylinder; 4, upper thrust ring; 5, upper rubber cylinder locking ring; 6, first hydraulic cylinder; 7, first piston; 8, second hydraulic cylinder; 9, second piston; 10, upper slip locking ring; 11, upper cone; 12, slip; 1201, first expansion cone surface; 1202, second expansion cone surface; 1203, third expansion cone surface; 13, lower cone; 14, connecting sleeve; 15, third piston; 16, lower slip locking ring; 17, third hydraulic cylinder; 18, second sliding groove; 19, second protrusion; 20, fourth piston; 21, fourth hydraulic cylinder; 22, lower rubber cylinder locking ring; 23, lower thrust ring; 24, second rubber sealing cylinder; 25, unsealing cylinder; 26, annular outer protrusion; 27, second bolt; 28, ring groove; 29, first through hole; 30, second through hole; 31, third through hole; 32, fourth through hole; 33, third sliding groove; 34, third protrusion; 100, injection and production pipe; 200, packer; 300, setting joint pipe; 400, shear ball sleeve pipe; 500, guide guide pipe; 600, first compression sleeve; 700, second compression sleeve; 800, third compression sleeve; 900, fourth compression sleeve. DETAILED DESCRIPTION

[0066] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0067] The present application provides a packer for energy storage injection and production, Figure 1 The present application provides a packer for energy storage injection and production, Figure One The present application provides a packer for energy storage injection and production, Figure 1 、 Figure 2 、 Figure 10 The packer for energy storage injection and production comprises an inner tube 1 and a first assembly, a second compression sleeve 700, a slip 12, a third compression sleeve 800 and a second assembly which are sequentially sleeved on the outer wall of the inner tube 1 and abut at the first and last ends.

[0068] The tail end of the third compression assembly 800 is slidingly sleeved with the head end of the second assembly, the side wall of the head end of the second assembly is provided with an axially extending second sliding groove 18, the side wall of the tail end of the third compression assembly 800 is provided with a second protrusion 19 which is slidingly connected with the second sliding groove 18, and the side wall of the inner tube 1 is provided with a through hole which is in communication with the compression cavities of the second compression assembly 700 and the third compression assembly 800;

[0069] The hydraulic medium is injected into the compression cavities of the second compression assembly 700 and the third compression assembly 800 to drive the head and tail ends of the slip 12 at the output end of the second compression assembly 700 and the third compression assembly 800 to be extruded, so that the slip 12 is in the working state of being expanded at both ends, and the outer wall of the inner tube 1 is further sleeved with a second non-return component and a third non-return component which are used to block the reset of the output end of the second compression assembly 700 and the output end of the third compression assembly 800;

[0070] The inner wall of the third compression assembly 800 is provided with an annular groove 28 which accommodates the third non-return component, and the outer wall of the inner tube 1 is provided with a middle annular block which is located in the inner cavity of the annular groove 28, the tail end of the middle annular block faces the third non-return component and is kept a predetermined distance from the third non-return component, when the side wall of the inner tube 1 between the tail end of the middle annular block and the third non-return component is cut, the inner tube 1 is divided into an upper half of the inner tube 1 and a lower half of the inner tube 1 by the cutting line, at this time, the outer wall of the upper half of the inner tube 1 is sleeved with the first assembly, the second compression assembly 700 and the slip 12, the outer wall of the lower half of the inner tube 1 is sleeved with the third compression assembly 800 and the second assembly, and the relative positions of the first assembly and the second assembly to the inner tube 1 remain fixed, the second compression assembly 700, the slip 12 and the third compression assembly 800 are all slidingly sleeved on the outer wall of the inner tube 1, correspondingly, the third compression assembly 800, the lower half of the inner tube 1 and the second assembly are moved downward until the inner wall of the annular groove 28 abuts against the head end of the middle annular block, and the inner wall of the end of the second sliding groove 18 away from the slip 12 abuts against the second protrusion 19, and the slip 12 is restored from the working state to the initial state.

[0071] It should be noted that there are corresponding special mechanical cutters or hydraulic cutters in the process of oilfield construction, the mechanical cutter is cut by rotating the pipe column, and the hydraulic cutter is cut by pressing, which is known to those skilled in the art and will not be described here.

[0072] The injection-production packer provided in the application realizes the synchronous extrusion of the slips 12 from both ends without interference and mutual assistance through the driving of the second compression sleeve set 700 and the third compression sleeve set 800 in the inner cavity of the wellbore, so that the slips 12 are expanded to form anchoring with the inner wall of the wellbore, thereby ensuring the stability of the synchronous expansion deformation of the two ends of the slips 12; and the rapid unsealing of the slips 12 is realized through the cutting method of the inner tube 1, thereby meeting the operation demand of the overall rapid recovery of the packer, avoiding the damage to the inner wall of the wellbore, ensuring the safety of the recovery operation, and realizing the precision of the active state of the compression sleeve set through the liquid inlet driving mode.

[0073] In Figure 3 In the example shown, the first assembly includes the inner sleeve assembly 2, the first rubber sealing tube 3 and the first compression sleeve set 600 which are sequentially sleeved on the outer wall of the inner tube 1 and abut at the first and second ends; after the first compression sleeve set 600 is driven, the output end of the first compression sleeve set 600 extrudes the first rubber sealing tube 3 to move to one side of the inner sleeve assembly 2, the inner sleeve assembly 2 generates a reverse force on the first rubber sealing tube 3, so that the first rubber sealing tube 3 is deformed and changes from the initial state to the operation state of sealing the inner wall of the wellbore, thereby realizing the first layer sealing operation on the inner wall of the wellbore.

[0074] The outer wall of the inner tube 1 is sleeved with a first reverse blocking component for blocking the reset of the output end of the first compression sleeve set 600; after the output end of the first compression sleeve set 600 pushes the first rubber sealing tube 3 to deform, the first reverse blocking component blocks the reset of the output end of the first compression sleeve set 600, so that the first rubber sealing tube 3 remains in the deformed operation state, avoiding the recovery of the first rubber sealing tube 3 to the initial state, and improving the stability of the first layer sealing operation.

[0075] Correspondingly, in Figure 7 In the example shown, the second assembly includes the fourth compression sleeve set 900, the second rubber sealing tube 24 and the lower unsealing assembly which are sequentially sleeved on the outer wall of the inner tube 1 and abut at the first and second ends; after the fourth compression sleeve set 900 is driven, the output end of the fourth compression sleeve set 900 extrudes the second rubber sealing tube 24 to move to one side of the lower unsealing assembly, the lower unsealing assembly generates a reverse force on the second rubber sealing tube 24, so that the second rubber sealing tube 24 is deformed to the operation state of sealing the inner wall of the wellbore, thereby realizing the second layer sealing operation on the inner wall of the wellbore.

[0076] Meanwhile, the outer wall of the inner tube 1 is sleeved with a fourth reverse blocking component for blocking the reset of the output end of the fourth compression sleeve set 900; after the output end of the fourth compression sleeve set 900 pushes the second rubber sealing tube 24 to deform, the fourth reverse blocking component blocks the reset of the output end of the fourth compression sleeve set 900, so that the second rubber sealing tube 24 remains in the deformed operation state, avoiding the recovery of the second rubber sealing tube 24 to the initial state, and improving the stability of the second layer sealing operation.

[0077] On the basis of setting the first sealing cylinder 3 and the second sealing cylinder 24, the upper and lower sealing functions of the packer are realized, and compared with the traditional one sealing layer, the sealing effect of the device is greatly improved, and through the corresponding setting of the two independent first compression sleeve 600 and fourth compression sleeve 900, the problem of single failure causing overall failure caused by the shared locking mode is avoided.

[0078] Reference Figure 7 The lower unsealing assembly includes an unsealing cylinder 25, an annular outer protrusion 26 on the outer wall of the inner tube 1, and a second pin 27 that is connected to the annular outer protrusion 26 and can be cut off. The inner wall of the tail end of the unsealing cylinder 25 is connected to the outer wall of the annular outer protrusion 26, and the inner wall of the annular inner protrusion arranged at the head end of the unsealing cylinder 25 is slidably connected to the outer wall of the inner tube 1. The head end of the unsealing cylinder 25 is connected to the tail end of the second sealing cylinder 24.

[0079] It should be noted that in this embodiment, the shear force required to cut off the second pin 27 is greater than the deformation force of the second sealing cylinder 24 in the working state, so as to avoid the second pin 27 being cut off during the deformation of the second sealing cylinder 24, thereby affecting the sealing effect of the second sealing cylinder 24 on the inner wall of the wellbore.

[0080] After the inner tube 1 side wall between the middle annular block tail end and the third reverse component is cut, the inner tube 1 is divided into an upper half and a lower half, the inner wall of the annular groove 28 is in abutment with the head end of the middle annular block, and the upper half of the inner tube 1 and the lower half of the inner tube 1 are indirectly connected through the second sliding groove 18 and the second protrusion 19. At this time, the slips 12 are restored from the working state to the initial state. The device is lifted by the ground lifting equipment, and in this process, the upward force transmitted by the ground lifting equipment to the inner tube 1 will be further transmitted to the second pin 27 and the unsealing cylinder 25. The static friction force between the deformed second sealing cylinder 24 and the inner wall of the wellbore will be transmitted to the second pin 27. With the increase of the lifting force, the force acting on the second pin 27 by the unsealing cylinder 25 and the inner tube 1 gradually increases. When the lifting force is greater than the sum of the shear force required to cut off the second pin 27 and the gravity of the device itself, and less than the friction force between the deformed second sealing cylinder 24 and the inner wall of the wellbore, the second pin 27 is cut off, and the unsealing cylinder 25 moves to the side of the annular outer protrusion 26 to form mutual abutment between the annular outer protrusion 26 and the annular inner protrusion. At the same time, due to the change in the position of the unsealing cylinder 25, the relative distance between the unsealing cylinder 25 and the fourth compression sleeve 900 is increased, so that the second sealing cylinder 24 is restored from the working state to the initial state, and the sealing is released.

[0081] In addition, if the friction between the second sealing rubber sleeve 24 and the inner wall of the wellbore after deformation is small and less than the shearing force required for cutting off the second pin member 27, the operation requirement of the second sealing rubber sleeve 24 from the operating state to the initial state does not need to be considered, and the direct operation of the lifting and recovery device is carried out.

[0082] Correspondingly, in the Figure 3 and Figure 9 In the example shown, the inner liner assembly 2 includes a liner 201, a guide sleeve 202;

[0083] The inner wall of the liner 201 is fixedly sleeved with the outer wall of the inner tube 1, the outer wall of the liner 201 is slidably sleeved with the inner wall of the guide sleeve 202, and the guide sleeve 202 and the liner 201 are connected by a first pin member 203 to form a cuttable pin connection, the first guide sleeve 202 is provided with a first sliding groove 204 extending in the axial direction on the side wall, the outer wall of the liner 201 is provided with a first protrusion 205 inserted into the first sliding groove 204 and slidably sleeved with the first sliding groove 204, the inner wall of the end of the first sliding groove 204 away from the first sealing rubber sleeve 3 is kept a predetermined distance from the first protrusion 205, and the tail end of the guide sleeve 202 abuts against the head end of the first sealing rubber sleeve 3.

[0084] Similarly, it should be noted that in the present embodiment, the shearing force required for cutting off the first pin member 203 is greater than the deformation force of the first sealing rubber sleeve 3 in the operating state, so as to avoid the first pin member 203 being cut off during the deformation of the first sealing rubber sleeve 3, thereby affecting the sealing effect of the first sealing rubber sleeve 3 on the inner wall of the wellbore.

[0085] The inner tube 1 is divided into an upper half and a lower half after the inner tube 1 side wall between the middle annular block tail end and the third reverse component is cut, and the inner wall of the ring groove 28 abuts against the head end of the middle annular block. The upper half of the inner tube 1 and the lower half of the inner tube 1 are indirectly connected through the second sliding groove 18 and the second protrusion 19. At this time, the slip 12 is restored from the working state to the initial state. The device is lowered by ground hoisting equipment. In this process, the deformed first sealing rubber 3 generates a static friction force with the inner wall of the wellbore. Combined with the gravity of the whole packer, the upper central pipe 102 gives the bushing 201 and the guide sleeve 202 a downward force. The deformed first sealing rubber 3 gives the first pin 203 an upward force due to the friction with the inner wall of the wellbore. When the friction between the deformed first sealing rubber 3 and the inner wall of the wellbore is greater than the shear force required for the first pin 203 to be cut off, the downward force given by the upper central pipe 102 to the first pin 203 is greater than the shear force required for the first pin 203 to be cut off and less than the friction between the deformed first sealing rubber 3 and the inner wall of the wellbore, the first pin 203 is cut off, and the guide sleeve 202 moves away from the first sealing rubber 3 to the first protrusion 205 and the inner wall of the first sliding groove 204 away from the first sealing rubber 3 to form mutual abutment. At the same time, due to the change in the position of the guide sleeve 202, the relative distance between the guide sleeve 202 and the first compression sleeve 600 is increased, so that the first sealing rubber 3 is restored from the working state to the initial state, and the sealing is released.

[0086] In addition, if the friction between the deformed first sealing rubber 3 and the inner wall of the wellbore is small and less than the shear force required for the first pin 203 to be cut off, the operation requirement of the second sealing rubber 24 from the working state to the initial state does not need to be considered, and the device is directly operated.

[0087] In this embodiment, referring to Figures 3-7 , the inner tube 1 comprises a coupling 101, an upper central pipe 102, an upper locking pipe 103, a lower locking pipe 104, and a lower central pipe 105 which are sequentially sleeved;

[0088] The outer wall of the upper central pipe 102 is sleeved with an inner bushing assembly 2, a first sealing rubber 3, and a first compression sleeve 600;

[0089] The outer wall of the upper locking pipe 103 is sleeved with a second compression sleeve 700 and a slip 12;

[0090] The outer wall of the lower locking pipe 104 is sleeved with a third compression sleeve 800;

[0091] The outer wall of the lower central pipe 105 is sleeved with a fourth compression sleeve 900, a second sealing rubber 24, and a lower unsealing assembly.

[0092] By decomposing the inner tube 1 into five components, namely the coupling 101, the upper central tube 102, the upper locking tube 103, the lower locking tube 104, and the lower central tube 105, the convenience of the device in transportation, recycling, and installation is greatly improved. During the recycling process, only the lower locking tube 104 needs to be cut, without affecting other components, so that other components can be reused, directly reducing the use and maintenance cost of the device.

[0093] To further illustrate the specific structure of the device, refer to Figure 3 The outer wall of the tail end of the upper central tube 102 is provided with threads, the upper locking tube 103 includes a sleeve part and a tube part connected at the head and tail, the inner diameter and outer diameter of the tube part are consistent with those of the upper central tube 102, the inner diameter of the sleeve part is consistent with the outer diameter of the upper central tube 102, and the inner wall of the sleeve part is provided with threads adapted to the tail end of the upper central tube 102, so as to form a threaded sleeve joint between the outer wall of the tail end of the upper central tube 102 and the inner wall of the head end of the upper locking tube 103.

[0094] Taking the head end of the inner tube 1 as the starting end, the first compression assembly 600 includes the upper thrust ring 4, the upper rubber cylinder lock ring 5, the first hydraulic cylinder 6, and the first piston 7, which are sequentially sleeved on the outer wall of the inner tube 1.

[0095] The head end of the upper thrust ring 4 is sleeved on the outer wall of the upper central tube 102, the head end of the upper thrust ring 4 abuts against the first composite sealing rubber cylinder 07, the tail end inner wall of the upper thrust ring 4 is threadedly sleeved on the outer wall of the head end of the first hydraulic cylinder 6, and the tail end inner wall of the first hydraulic cylinder 6 is sealingly sleeved on the outer wall of the head end of the upper locking tube 103.

[0096] The tail end inner wall of the first hydraulic cylinder 6 is also sealingly sleeved with the first piston 7 arranged at an interval from the head end of the upper locking tube 103, the inner wall of the first piston 7 is sealingly sleeved on the outer wall of the upper central tube 102, the tail end wall of the first piston 7, the head end wall of the upper locking tube 103, the tail end inner wall of the first hydraulic cylinder 6, and the outer wall of the upper central tube 102 form a compression inner cavity of the first compression assembly 600, and a first through hole 29 is formed on the side wall of the inner tube 1 and is in communication with the compression inner cavity of the first compression assembly 600.

[0097] The first reverse prevention component is the upper rubber cylinder lock ring 5, the inner wall of the upper rubber cylinder lock ring 5 is sleeved on the outer wall of the upper central tube 102 through a one-way sawtooth thread, and the outer wall of the upper rubber cylinder lock ring 5 is sleeved on the tail end inner wall of the upper thrust ring 4 through a one-way sawtooth thread.

[0098] When the liquid medium with a certain pressure is filled in the inner cavity of the inner tube 1, the liquid medium enters the compression inner cavity of the first compression assembly 600 through the first through hole 29, and acts on the end wall of the tail end of the first piston 7, drives the first piston 7, the first hydraulic cylinder 6, the upper thrust ring 4, and the upper rubber sleeve locking ring 5 to move synchronously to one side of the first rubber sleeve 3, and extrudes the first rubber sleeve 3; and under the action of the upper rubber sleeve locking ring 5, the upper rubber sleeve locking ring 5 and the upper thrust ring 4 can only move to one side of the first rubber sleeve 3 and cannot move away from the first rubber sleeve 3, thereby realizing continuous extrusion of the first rubber sleeve 3.

[0099] In the recovery operation, the packer is lowered by using ground lifting equipment. Due to the static friction between the deformed first rubber sleeve 3 and the inner wall of the wellbore, as the lowering force increases, combined with the gravity of the packer as a whole, the upper central tube 102 gives the bushing 201 and the guide sleeve 202 a downward force through the first pin member 203. However, the deformed first rubber sleeve 3 will give the first pin member 203 an upward force due to the friction with the inner wall of the wellbore. As the lowering force further increases, when the downward force given by the upper central tube 102 to the first pin member 203 is greater than the shear force required to cut off the first pin member 203 and less than the friction between the deformed first rubber sleeve 3 and the inner wall of the wellbore, the first pin member 203 is cut off, the guide sleeve 202 moves away from the first rubber sleeve 3, and the first rubber sleeve 3 returns to the initial state from the working state, thereby realizing the release of the blockage.

[0100] Correspondingly, referring to Figure 4 and Figure 12 , the second compression assembly 700 includes a second hydraulic cylinder 8, a second piston 9, an upper slip locking ring 10, and an upper cone 11 which are sequentially sleeved on the outer wall of the inner tube 1;

[0101] The first end inner wall of the second hydraulic cylinder 8 is sealingly sleeved on the outer wall of the upper locking tube 103, the first end of the second hydraulic cylinder 8 is butted against the tail end of the first compression assembly 600, the tail end inner wall of the second hydraulic cylinder 8 is sealingly sleeved on the outer wall of the first end of the second piston 9, the first end inner wall of the second piston 9 is sealingly sleeved on the outer wall of the upper locking tube 103, and the first end of the second piston 9 is spaced apart from the tail end of the second hydraulic cylinder 8. The tail end inner wall of the second hydraulic cylinder 8, the first end wall of the second piston 9, and the outer wall of the upper locking tube 103 jointly form a compression inner cavity of the second compression assembly 700, and the second through hole 30 is formed in the side wall of the inner tube 1 and is in communication with the compression inner cavity of the second compression assembly 700;

[0102] The first end inner wall of the second piston 9 is sleeved on the outer wall of the upper locking tube 103, the tail end inner wall of the second piston 9 is threadedly sleeved on the outer wall of the first end of the upper cone 11, the inner wall of the upper cone 11 is sleeved on the outer wall of the upper locking tube 103, and the tail end of the upper cone 11 abuts against the inner tapered surface of the first end of the slip 12;

[0103] The second reverse stopping component is the upper slip locking ring 10, the inner wall of the tail end part of the secondary piston 9 is further sleeved with the outer wall of the upper slip locking ring 10 through the one-way sawtooth thread, the inner wall of the upper slip locking ring 10 is sleeved with the outer wall of the upper locking pipe 103 through the one-way sawtooth thread, and the outer wall of the upper slip locking ring 10 is sleeved with the inner wall of the tail end part of the secondary piston 9 and is arranged in a spaced manner with the head end part of the upper cone 11.

[0104] When the liquid medium with a certain pressure is filled in the inner cavity of the inner pipe 1, the liquid medium enters the compression inner cavity of the second compression assembly 700 through the second through hole 30 and acts on the end wall of the head end part of the secondary piston 9, so as to drive the secondary piston 9, the upper slip locking ring 10 and the upper cone 11 to move synchronously to one side of the slip 12 and press the slip 12; and under the action of the upper slip locking ring 10, the secondary piston 9, the upper slip locking ring 10 and the upper cone 11 can only move to one side of the slip 12 and cannot move away from the slip 12, so that the continuous pressing operation of the slip 12 is realized.

[0105] It should be noted that, in the example shown, Figure 12 the inner and outer walls of the upper slip locking ring 10 are provided with one-way sawteeth and are consistent in direction, wherein the outer wall of the upper locking pipe 103 and the secondary piston 9 are also provided with one-way sawteeth, so that the upper slip locking ring 10 can only move to the right side relative to the upper locking pipe 103, the first reverse stopping component, the third reverse stopping component and the fourth reverse stopping component in the application are consistent with the structure of the upper slip locking ring 10, and the sawteeth of the upper slip locking ring 10 and the fourth reverse stopping component are consistent in direction, and the sawteeth of the first reverse stopping component and the third reverse stopping component are consistent in direction.

[0106] Correspondingly, with reference to Figure 5 , Figure 6 and Figure 11 , the inner diameter and the outer diameter of the upper locking pipe 103 and the lower locking pipe 104 are consistent, and the middle annular block is the connecting sleeve 14, the inner diameter of the connecting sleeve 14 is consistent with the outer diameter of the upper locking pipe 103 and the lower locking pipe 104, and the inner walls of the head end part and the tail end part of the connecting sleeve 14 are respectively threadedly and sealingly sleeved with the outer wall of the tail end part of the upper locking pipe 103 and the outer wall of the head end part of the lower locking pipe 104;

[0107] The third compression assembly 800 comprises, in sequence, the lower cone 13, the tertiary piston 15, the lower slip locking ring 16 and the tertiary hydraulic cylinder 17 which are sleeved with the outer wall of the inner pipe 1, wherein the third reverse stopping component is the slip locking ring 35.

[0108] The lower cone 13 is sleeved on the outer wall of the upper locking pipe 103, and the first end of the lower cone 13 abuts against the inner tapered surface of the tail end of the slip 12. The tail end of the lower cone 13 is threadedly sleeved on the inner wall of the first end of the third piston 15. The first end of the third piston 15 is provided with a ring groove 28 for accommodating the connecting sleeve 14 and the lower slip locking ring 16. The lower slip locking ring 16 is located on both sides of the connecting sleeve 14 and is spaced apart from the lower cone 13 by a predetermined distance. The inner wall of the lower slip locking ring 16 is threadedly sleeved on the outer wall of the lower locking pipe 104 through a one-way sawtooth thread. The outer wall of the lower slip locking ring 16 is threadedly sleeved on the inner wall of the ring groove 28 of the third piston 15 through a one-way sawtooth thread.

[0109] The tail end of the third piston 15 is sealingly sleeved on the outer wall of the lower locking pipe 104. The outer wall of the tail end of the third piston 15 is sealingly sleeved on the inner wall of the first end of the third hydraulic cylinder 17. The inner wall of the tail end of the third hydraulic cylinder 17 is sealingly sleeved on the outer wall of the lower locking pipe 104. The tail end of the third hydraulic cylinder 17 is abutted against the first end of the third compression assembly 800. The inner wall of the first end of the third hydraulic cylinder 17, the tail end of the third piston 15, and the outer wall of the lower locking pipe 104 jointly form a compression inner cavity of the third compression assembly 800. The third through hole 31 is formed in the side wall of the inner pipe 1 and is in communication with the compression inner cavity of the third compression assembly 800.

[0110] When the inner cavity of the inner pipe 1 is filled with liquid medium with a certain pressure, the liquid medium enters the compression inner cavity of the third compression assembly 800 through the third through hole 31 and acts on the tail end of the third piston 15, thereby driving the third piston 15, the lower slip locking ring 16, and the lower cone 13 to move synchronously to one side of the slip 12 and press the slip 12. Under the action of the lower slip locking ring 16, the third piston 15, the lower slip locking ring 16, and the lower cone 13 can only move to one side of the slip 12 and cannot move away from the slip 12, thereby realizing continuous pressing operation of the slip 12.

[0111] The side wall of the first end of the third hydraulic cylinder 17 is provided with an axially extending second sliding groove 18. The outer wall of the tail end of the third piston 15 is provided with a second protrusion 19 which is inserted into the second sliding groove 18 and is in sliding connection with the second sliding groove 18. The second protrusion 19 and the inner wall of the second sliding groove 18 near the slip 12 are spaced apart by a predetermined distance.

[0112] The side wall of the tail end of the third hydraulic cylinder 17 is provided with an axially extending third sliding groove 33. The outer wall of the tail end of the lower locking pipe 104 is provided with a third protrusion 34 which is in sliding connection with the third sliding groove 33. The third protrusion 34 and the inner wall of the third sliding groove 33 near the slip 12 are spaced apart by a predetermined distance.

[0113] In the process of carrying out the device recovery operation, the ground lifting equipment is connected with the coupling 101, and the whole inner tube 1 is given an upward force. After cutting the lower locking pipe 104 side wall between the lower slip ring lock ring 16 and the connecting sleeve 14, the lower locking pipe 104 is divided into the upper half of the lower locking pipe 104 and the lower half of the lower locking pipe 104 by the cutting line. The upper half of the lower locking pipe 104 is screwed with the connecting sleeve 14 to obtain the upward force provided by the ground lifting equipment, while the lower half of the lower locking pipe 104 cannot directly obtain the upward force provided by the ground lifting equipment from the upper half of the lower locking pipe 104 because it is separated from the upper half of the lower locking pipe 104.

[0114] Under the action of gravity, the slip 12, the lower cone 13, the third stage piston 15, the lower slip ring lock ring 16, the lower half of the lower locking pipe 104, and the third stage hydraulic cylinder 17 will all move downward until the second lug 19 abuts against the inner wall of the second sliding groove 18 near the side of the slip 12. At the same time, the position of the lower slip ring lock ring 16 changes, so that the lower cone 13 removes the extrusion on the slip 12, and the slip 12 recovers from the working state to the initial state, releasing the expansion anchoring to the inner wall of the wellbore. Meanwhile, the third lug 34 abuts against the inner wall of the third sliding groove 33 near the side of the slip 12, and the first end of the connecting sleeve 14 also abuts against the tail end of the lower cone 13. On the basis of the threaded sleeve connection between the outer wall of the tail end of the lower cone 13 and the inner wall of the first end of the third stage piston 15, the connecting sleeve 14 provides upward force to the lower cone 13, the third stage piston 15, the third stage hydraulic cylinder 17, the lower half of the lower locking pipe 104, the lower central pipe 105, and the lower central pipe 105.

[0115] Correspondingly, referring to Figure 7 , the first end of the lower central pipe 105 is provided with a thread, and the lower locking pipe 104 includes a pipe body connected at the first and second ends and a ring sleeve. The inner diameter and outer diameter of the pipe body are consistent with the inner diameter and outer diameter of the lower central pipe 105, and the inner diameter of the ring sleeve is consistent with the outer diameter of the lower central pipe 105. The inner wall of the ring sleeve is provided with a thread that is adapted to the first end of the lower central pipe 105, so as to realize the threaded sealing connection between the inner wall of the second end of the lower locking pipe 104 and the outer wall of the first end of the lower central pipe 105.

[0116] The fourth compression sleeve 900 includes a fourth stage piston 20, a fourth stage hydraulic cylinder 21, a lower rubber cylinder lock ring 22, and a lower thrust ring 23, which are sequentially sleeved on the outer wall of the inner tube 1.

[0117] The first end portion inner wall of the fourth hydraulic cylinder 21 is sealingly sleeved with the outer wall of the lower locking pipe 104 tail end portion, and the outer wall of the fourth hydraulic cylinder 21 first end portion is also sealingly sleeved with the outer wall of the fourth piston 20, and the outer wall of the fourth piston 20 is sealingly sleeved with the inner wall of the fourth hydraulic cylinder 21 first end portion and is arranged in space with the lower locking pipe 104 tail end portion, and the inner wall of the fourth piston 20 is sealingly sleeved with the outer wall of the lower central pipe 105, and the first end portion end wall of the fourth piston 20, the outer wall of the lower central pipe 105, the tail end portion end wall of the lower locking pipe 104 and the inner wall of the fourth hydraulic cylinder 21 first end portion together form a compression inner cavity of the fourth compression assembly 900, and the fourth through hole 32 is formed in the side wall of the inner tube 1 and is in communication with the compression inner cavity of the fourth compression assembly 900.

[0118] The outer wall of the tail end portion of the fourth hydraulic cylinder 21 is threadedly sleeved with the inner wall of the first end portion of the lower thrust ring 23, the inner wall of the tail end portion of the lower thrust ring 23 is sleeved with the outer wall of the lower central pipe 105, and the tail end portion of the lower thrust ring 23 is in abutment with the first end of the second rubber sealing cylinder 24.

[0119] The fourth reverse stopping component is the lower rubber sealing cylinder lock ring 22, the inner wall of the lower rubber sealing cylinder lock ring 22 is threadedly sleeved with the outer wall of the central pipe 53 through a one-way sawtooth thread, the outer wall of the lower rubber sealing cylinder lock ring 22 is threadedly sleeved with the inner wall of the first end portion of the lower thrust ring 23 through a one-way sawtooth thread, and the lower rubber sealing cylinder lock ring 22 is arranged in space with the tail end portion of the fourth hydraulic cylinder 21.

[0120] When the inner cavity of the inner tube 1 is filled with liquid medium with a certain pressure, the liquid medium enters the compression inner cavity of the fourth compression assembly 900 through the fourth through hole 32 and acts on the first end portion end wall of the fourth piston 20, thereby driving the fourth piston 20, the fourth hydraulic cylinder 21, the lower rubber sealing cylinder lock ring 22 and the lower thrust ring 23 to move synchronously to one side of the second rubber sealing cylinder 24, so as to extrude the second rubber sealing cylinder 24; and under the action of the lower rubber sealing cylinder lock ring 22, the lower rubber sealing cylinder lock ring 22 and the lower thrust ring 23 can only move to one side of the second rubber sealing cylinder 24 and cannot move away from the second rubber sealing cylinder 24, thereby realizing continuous extrusion operation on the second rubber sealing cylinder 24.

[0121] During the device recovery operation, the upward force transmitted to the lower central pipe 105 by the ground lifting equipment will be further transmitted to the second latch 27 and the unblocking cylinder 25, and at this time, there is a downward friction force between the deformed second rubber sealing cylinder 24 and the inner wall of the wellbore, and as the upward force increases, the force acting on the second latch 27 by the unblocking cylinder 25 and the lower central pipe 105 gradually increases, when the upward force is greater than the sum of the shear force required for cutting off the second latch 27 and the gravity of the device as a whole, and is less than the friction force between the deformed second rubber sealing cylinder 24 and the inner wall of the wellbore, the second latch 27 is cut off, the unblocking cylinder 25 moves away from the second rubber sealing cylinder 24, so that the second rubber sealing cylinder 24 recovers from the working state to the initial state, and the blocking is removed.

[0122] In this embodiment, annular cavities are provided between the inner wall of the upper end of the secondary hydraulic cylinder 8 and the outer wall of the upper locking tube 103, and between the inner wall of the lower end of the tertiary hydraulic cylinder 17 and the outer wall of the lower locking tube 104. By setting the cavities, gas is pre-stored, and when the positions of the secondary hydraulic cylinder 8 and the tertiary hydraulic cylinder 17 change, it is easy to remove the liquid in the gap, prevent the formation of liquid lock, and thus prevent the operation of the components from being hindered.

[0123] Among them, Figure 8 In this embodiment, the slip 12 adopts a cylindrical cage structure. Several annular teeth are arranged in an axial array on the outer walls of both ends of the slip 12. Several circumferentially arranged and axially extending dividing grooves are opened at both ends of the slip 12, and the dividing grooves at both ends of the slip 12 are staggered. In this embodiment, the slip 12 is made of elastic metal material, for example, alloy steel support. The slip 12 adopts a segmented structure and has certain elastic properties after heat treatment. The dividing grooves on both sides facilitate the outward expansion of both ends of the slip 12, and under the action of the annular teeth, it forms a tight anchor with the inner wall of the well barrel, ensuring the stability and firmness of the device placed in the well barrel.

[0124] Furthermore, in this embodiment, the outer walls of both ends of the slip 12 are detachably connected to the outer wall of the inner tube 1 via cutting pins, facilitating the initial fixation of the slip 12's installation position. Moreover, the cutting pins installed on the outer walls of the slip 12 at both ends are of different specifications; the cutting pins installed on the outer wall of the slip 12 at the beginning are larger than those installed on the outer wall of the slip 12 at the end, ensuring that the cutting pins at the end of the slip 12 are cut off first, and the cutting pins at the beginning of the slip 12 are cut off first, further limiting the outward expansion sequence of the slip 12's ends.

[0125] In addition, the slip 12 has three expansion cones inside both ends, namely the first expansion cone 1201, the second expansion cone 1202 and the third expansion cone 1203. During the expansion process of the slip 12, the third expansion cone 1203 first contacts the upper cone 11 and the lower cone 13, then the second expansion cone 1202 contacts, and finally the first expansion cone 1201 contacts. By controlling the order of contact, the slip 12 can better expand outward to achieve expansion and seal, thereby improving the anchoring effect.

[0126] In actual use, the liquid medium is injected into the inner cavity of the inner tube 1, so that the liquid medium enters the compression cavities of the second compression assembly 700, the second compression assembly 700, the third compression assembly 800, and the fourth compression assembly 900 through the first through hole 29, the second through hole 30, the third through hole 31, and the fourth through hole 32, respectively, to drive the first compression assembly 600 and the inner sleeve assembly 2 to compress the first rubber sleeve 3 to achieve expansion sealing, drive the second compression assembly 700 and the third compression assembly 800 to compress the slip 12 to achieve expansion anchoring, and drive the fourth compression assembly 900 and the lower unsealing assembly to compress the second rubber sleeve 24 to achieve expansion sealing; the operation requirement of the packer to seal the inner wall of the wellbore is completed.

[0127] During the device recovery operation, the ground lifting equipment is connected to the coupling 101 to give the inner tube 1 an upward force, and the lower locking pipe 104 sidewall between the slip locking ring 16 and the connecting sleeve 14 is cut, so that the lower locking pipe 104 is divided into an upper half and a lower half by the cutting line, and the upper half and the connecting sleeve 14 are threadedly connected to obtain the upward force provided by the ground lifting equipment, while the lower half cannot directly obtain the upward force provided by the ground lifting equipment from the upper half because it is separated from the upper half.

[0128] Under the action of gravity, the slip 12, the lower cone 13, the third-stage piston 15, the lower slip locking ring 16, the lower half of the lower locking pipe 104, and the third-stage hydraulic cylinder 17 all move downward until the second lug 19 abuts against the inner wall of the side of the second sliding groove 18 close to the slip 12, so that the slip 12 returns to the initial state from the operating state, and the expansion anchoring to the inner wall of the wellbore is released.

[0129] At the same time, under the action of gravity, the third lug 34 abuts against the inner wall of the side of the third sliding groove 33 close to the slip 12, and the first end of the connecting sleeve 14 also abuts against the tail end of the lower cone 13, and on the basis of the threadedly connected outer wall of the tail end of the lower cone 13 and the inner wall of the first end of the third-stage piston 15, the connecting sleeve 14 provides upward force to the lower cone 13, the third-stage piston 15, the third-stage hydraulic cylinder 17, the lower half of the lower locking pipe 104, the lower central pipe 105, and the lower central pipe 105.

[0130] The upward force transmitted to the lower central pipe 105 by the ground hoisting equipment is further transmitted to the second latch 27 and the unblocking cylinder 25. At this time, the downward friction force between the deformed second sealing cylinder 24 and the inner wall of the wellbore exists. With the increase of the upward force, the force acting on the second latch 27 by the unblocking cylinder 25 and the lower central pipe 105 gradually increases. When the upward force is greater than the shear force required for cutting off the second latch 27 and less than the friction force between the deformed second sealing cylinder 24 and the inner wall of the wellbore, the second latch 27 is cut off, the unblocking cylinder 25 moves away from the second sealing cylinder 24, so that the second sealing cylinder 24 recovers from the working state to the initial state, and the blocking is released.

[0131] The packer is lowered by the ground hoisting equipment. Due to the static friction force between the deformed first sealing cylinder 3 and the inner wall of the wellbore, with the increase of the downward force, the downward force acting on the bushing 201 and the guide sleeve 202 by the upper central pipe 102 through the first latch 203 is combined with the gravity of the whole packer. However, the deformed first sealing cylinder 3 will give the first latch 203 an upward force due to the friction force with the inner wall of the wellbore. With the further increase of the downward force, when the downward force acting on the first latch 203 by the upper central pipe 102 is greater than the shear force required for cutting off the first latch 203 and less than the friction force between the deformed first sealing cylinder 3 and the inner wall of the wellbore, the first latch 203 is cut off, the guide sleeve 202 moves away from the first sealing cylinder 3, so that the first sealing cylinder 3 recovers from the working state to the initial state, and the blocking is released.

[0132] On this basis, referring to Figure 13 and Figure 14 , the application also provides a use method of the energy storage injection-production packer, which further comprises an injection-production pipe 100, a landing joint pipe 300, a shear ball sleeve pipe 400, and a guide lead pipe 500, and the shear ball sleeve pipe 400 is internally sleeved with a sealing sliding sleeve; the use method comprises the following steps:

[0133] The injection-production pipe 100, the packer 200, the landing joint pipe 300, the shear ball sleeve pipe 400, and the guide lead pipe 500 are sequentially connected in a sealed threaded manner to form an integral device, and the integral device is lowered into the inner cavity of the wellbore;

[0134] A steel ball adapted to the sealing sliding sleeve is put into the injection-production pipe 100 to block the inner cavity of the shear ball sleeve pipe 400, hydraulic medium is injected into the inner cavity of the integral device and pressure is applied, so that the hydraulic medium enters the compression inner cavities of the second compression sleeve 700 and the third compression sleeve 800, and the output ends of the second compression sleeve 700 and the third compression sleeve 800 are extruded to press the slips 12 until the anchoring operation is completed;

[0135] Continue to pressurize until the steel ball and the sealing sliding sleeve built in the shear ball seat fall down to the bottom of the well, and the installation of the whole device in the inner cavity of the wellbore is completed;

[0136] When the whole device needs to be recovered, the cutting tool is lowered to cut the inner tube 1 sidewall between the middle annular block tail end and the reverse stopping part, and the anchor operation of the slip 12 is released;

[0137] The whole device is pulled up to complete the recovery operation.

[0138] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between multiple elements or the interaction relationship between multiple elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0139] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy storage injection packer for use in wellbore plugging operations in a built-in wellbore internal cavity, characterized in that, The utility model relates to a kind of hydraulic cutting device, including: Inner tube (1) and first component, second compression sleeve (700), slip (12), third compression sleeve (800), second component are sequentially sleeved in inner tube (1) outer wall and butt joint at head and tail end, first component, second component are fixedly sleeved with inner tube (1); The tail end of the third compression sleeve (800) is slidably connected to the head end of the second component, the side wall of the head end of the second component is provided with an axially extending second sliding groove (18), the side wall of the tail end of the third compression sleeve (800) is provided with a second protrusion (19) that is slidably connected to the second sliding groove (18), and the side wall of the inner tube (1) is provided with a through hole that is in communication with the compression cavities of the second compression sleeve (700) and the third compression sleeve (800); Injecting hydraulic medium into the compression cavities of the second compression sleeve (700) and the third compression sleeve (800) to drive the output ends of the second compression sleeve (700) and the third compression sleeve (800) to extrude the slip (12) at the head and tail ends, so that the slip (12) is in an operating state of being expanded at both ends, and the outer wall of the inner tube (1) is further sleeved with a second non-return component and a third non-return component for blocking the output ends of the second compression sleeve (700) and the third compression sleeve (800) from returning to the original positions; The inner wall of the third compression sleeve (800) is provided with an annular groove (28) for accommodating the third non-return component, and the outer wall of the inner tube (1) is provided with a middle annular block located in the inner cavity of the annular groove (28), the tail end of the middle annular block faces the third non-return component and is kept at a predetermined distance from the third non-return component, when the side wall of the inner tube (1) between the tail end of the middle annular block and the third non-return component is cut, the third compression sleeve (800), the lower half of the inner tube (1), and the second component move downward until the inner wall of the annular groove (28) abuts against the head end of the middle annular block, so that the slip (12) returns to the initial state from the operating state; The first component includes an inner bushing assembly (2), a first sealing rubber tube (3), and a first compression sleeve (600) that are sequentially sleeved on the outer wall of the inner tube (1) and butt joint at the head and tail ends, the tail end of the first compression sleeve (600) is butt joint with the head end of the second compression sleeve (700); Driving the output end of the first compression sleeve (600) to extrude the first sealing rubber tube (3) to move to one side of the inner bushing assembly (2) causes the first sealing rubber tube (3) to deform to an operating state, and the outer wall of the inner tube (1) is sleeved with a first non-return component for blocking the output end of the first compression sleeve (600) from returning to the original position; The second component includes a fourth compression sleeve (900), a second sealing rubber tube (24), and a lower unsealing assembly that are sequentially sleeved on the outer wall of the inner tube (1) and butt joint at the head and tail ends, the head end of the fourth compression sleeve (900) is butt joint with the tail end of the third compression sleeve (800); Driving the output end of the fourth compression sleeve (900) to extrude the second sealing rubber tube (24) to move to one side of the lower unsealing assembly causes the second sealing rubber tube (24) to deform to an operating state, and the outer wall of the inner tube (1) is sleeved with a fourth non-return component for blocking the output end of the fourth compression sleeve (900) from returning to the original position.

2. The stored-energy injection-production packer of claim 1, wherein, The lower unsealing assembly comprises an unsealing barrel (25), an annular outer protrusion (26) on the outer wall of the inner tube (1), an inner wall of the tail end of the unsealing barrel (25) being sleeved with the outer wall of the annular outer protrusion (26) and being connected with the annular outer protrusion (26) through a second pin member (27) to form a cuttable pin connection, an annular inner protrusion being arranged on the inner wall of the head end of the unsealing barrel (25) and being spaced from the annular outer protrusion (26), the inner wall of the annular inner protrusion being slidably sleeved with the outer wall of the inner tube (1), and the head end of the unsealing barrel (25) being butted with the tail end of the second sealing rubber barrel (24). The shearing force required for cutting the second pin member (27) is greater than the deformation force of the second sealing rubber barrel (24) in the working state.

3. The stored-energy injection-production packer of claim 2, wherein: The inner bushing assembly (2) comprises a bushing (201) and a guide sleeve (202). The inner wall of the bushing (201) is fixedly sleeved with the outer wall of the inner tube (1), the outer wall of the bushing (201) is slidably sleeved with the inner wall of the guide sleeve (202), the guide sleeve (202) and the bushing (201) are connected through a first pin member (203) to form a cuttable pin connection, a first sliding groove (204) extending in the axial direction is arranged on the side wall of the guide sleeve (202), a first protrusion (205) is arranged on the outer wall of the bushing (201) and slidably sleeved with the first sliding groove (204), the inner wall of the end of the first sliding groove (204) away from the first sealing rubber barrel (3) is kept at a predetermined distance from the first protrusion (205), and the tail end of the guide sleeve (202) abuts against the head end of the first sealing rubber barrel (3). The shearing force required for cutting the first pin member (203) is greater than the deformation force of the first sealing rubber barrel (3) in the working state.

4. The stored-energy injection-production packer of claim 3, wherein: The inner tube (1) comprises a coupling (101), an upper central tube (102), an upper locking tube (103), a lower locking tube (104) and a lower central tube (105) which are sequentially sleeved. The outer wall of the upper central tube (102) is sleeved with the inner bushing assembly (2), the first sealing rubber barrel (3) and the first compression sleeve assembly (600). The outer wall of the upper locking tube (103) is sleeved with the second compression sleeve assembly (700) and the slip (12). The outer wall of the lower locking tube (104) is sleeved with the third compression sleeve assembly (800). The outer wall of the lower central tube (105) is sleeved with the fourth compression sleeve assembly (900), the second sealing rubber barrel (24) and the lower unsealing assembly.

5. The stored-energy injection-production packer of claim 4, wherein: The outer wall of the tail end of the upper central tube (102) is threadedly sleeved with the inner wall of the head end of the upper locking tube (103), the first compression sleeve assembly (600) comprises an upper thrust ring (4), an upper rubber barrel locking ring (5), a first hydraulic cylinder (6) and a first piston (7) which are sequentially sleeved on the outer wall of the inner tube (1). The head end of the upper thrust ring (4) is sleeved on the outer wall of the upper central tube (102), the head end of the upper thrust ring (4) abuts against the first composite sealing rubber barrel (07), the inner wall of the tail end of the upper thrust ring (4) is threadedly sleeved with the outer wall of the head end of the first hydraulic cylinder (6), and the inner wall of the tail end of the first hydraulic cylinder (6) is sealingly sleeved with the outer wall of the head end of the upper locking tube (103). The tail end inner wall of the primary hydraulic cylinder (6) is further sealed and sleeved with a primary piston (7) arranged at an interval with the head end of the upper locking pipe (103), the inner wall of the primary piston (7) is sealed and sleeved with the outer wall of the upper central pipe (102), the tail end end wall of the primary piston (7), the head end end wall of the upper locking pipe (103), the tail end inner wall of the primary hydraulic cylinder (6) and the outer wall of the upper central pipe (102) form a compression inner cavity of a first compression assembly (600), a first through hole (29) is formed in the side wall of the inner pipe (1) and is in communication with the compression inner cavity of the first compression assembly (600); The first reverse stopping component is an upper rubber sleeve locking ring (5), the inner wall of the upper rubber sleeve locking ring (5) is sleeved with the outer wall of the upper central pipe (102) through a one-way sawtooth thread, and the outer wall of the upper rubber sleeve locking ring (5) is sleeved with the tail end inner wall of the upper thrust ring (4) through a one-way sawtooth thread.

6. The stored-energy injection-production packer of claim 5, wherein, The second compression assembly (700) comprises, in sequence, a secondary hydraulic cylinder (8), a secondary piston (9), an upper slip locking ring (10) and an upper cone (11) sleeved with the outer wall of the inner pipe (1); The head end inner wall of the secondary hydraulic cylinder (8) is sealed and sleeved with the outer wall of the upper locking pipe (103), the head end of the secondary hydraulic cylinder (8) is butted with the tail end of the first compression assembly (600), the tail end inner wall of the secondary hydraulic cylinder (8) is sealed and sleeved with the head end outer wall of the secondary piston (9), the head end inner wall of the secondary piston (9) is sealed and sleeved with the outer wall of the upper locking pipe (103), and the head end of the secondary piston (9) is arranged at an interval with the tail end of the secondary hydraulic cylinder (8), the tail end inner wall of the secondary hydraulic cylinder (8), the head end end wall of the secondary piston (9) and the outer wall of the upper locking pipe (103) jointly form a compression inner cavity of a second compression assembly (700), a second through hole (30) is formed in the side wall of the inner pipe (1) and is in communication with the compression inner cavity of the second compression assembly (700); The head end inner wall of the secondary piston (9) is sleeved with the outer wall of the upper locking pipe (103), the tail end inner wall of the secondary piston (9) is threaded and sleeved with the head end outer wall of the upper cone (11), the inner wall of the upper cone (11) is sleeved with the outer wall of the upper locking pipe (103), and the tail end of the upper cone (11) and the head end of the slip (12) form an inner conical surface abutment; The second reverse stopping component is the upper slip locking ring (10), the tail end inner wall of the secondary piston (9) is further sleeved with the outer wall of the upper slip locking ring (10) through a one-way sawtooth thread, the inner wall of the upper slip locking ring (10) is sleeved with the outer wall of the upper locking pipe (103) through a one-way sawtooth thread, and the outer wall of the upper slip locking ring (10) is sleeved with the tail end inner wall of the secondary piston (9) through a one-way sawtooth thread and is arranged at an interval with the head end of the upper cone (11).

7. The stored-energy injection packer of claim 6, wherein, The middle annular block is a connecting sleeve (14), the inner walls of the head end and the tail end of the connecting sleeve (14) are respectively threadedly and sealingly sleeved with the tail end outer wall of the upper locking pipe (103) and the head end outer wall of the lower locking pipe (104), the third compression assembly (800) comprises, in sequence, a lower cone (13), a tertiary piston (15), a lower slip locking ring (16) and a tertiary hydraulic cylinder (17) sleeved with the outer wall of the inner pipe (1), and the lower slip locking ring (16) is a third reverse stopping component. The lower cone (13) is sleeved on the outer wall of the upper locking pipe (103), and the first end of the lower cone (13) is abutted against the inner tapered surface of the tail end of the slip (12), the outer wall of the tail end of the lower cone (13) is threadedly sleeved on the inner wall of the first end of the three-stage piston (15), the inner wall of the first end of the three-stage piston (15) is provided with a ring groove (28) for accommodating the connecting sleeve (14) and the lower slip locking ring (16), the lower slip locking ring (16) is located on the two sides of the connecting sleeve (14) and is spaced apart by a predetermined distance, and the inner wall of the lower slip locking ring (16) is threadedly sleeved on the outer wall of the lower locking pipe (104) through a one-way sawtooth thread, and the outer wall of the lower slip locking ring (16) is threadedly sleeved on the inner wall of the ring groove (28) of the three-stage piston (15) through a one-way sawtooth thread; The inner wall of the tail end of the three-stage piston (15) is sealingly sleeved on the outer wall of the lower locking pipe (104), the outer wall of the tail end of the three-stage piston (15) is sealingly sleeved on the inner wall of the first end of the three-stage hydraulic cylinder (17), the inner wall of the tail end of the three-stage hydraulic cylinder (17) is sealingly sleeved on the outer wall of the lower locking pipe (104), and the tail end of the three-stage hydraulic cylinder (17) is arranged in abutment with the first end of the third compression assembly (800), the inner wall of the first end of the three-stage hydraulic cylinder (17), the end wall of the tail end of the three-stage piston (15) and the outer wall of the lower locking pipe (104) jointly form a compression inner cavity of the third compression assembly (800), and the third through hole (31) is formed in the side wall of the inner pipe (1) and is in communication with the compression inner cavity of the third compression assembly (800); The side wall of the first end of the three-stage hydraulic cylinder (17) is provided with an axially extending second sliding groove (18), the outer wall of the tail end of the three-stage piston (15) is provided with a second protrusion (19) in sliding connection with the second sliding groove (18), and the second protrusion (19) and the inner wall of the side of the second sliding groove (18) close to the slip (12) are provided with a predetermined distance; The side wall of the tail end of the three-stage hydraulic cylinder (17) is provided with an axially extending third sliding groove (33), and the outer wall of the tail end of the lower locking pipe (104) is provided with a third protrusion (34) in sliding connection with the third sliding groove (33), and the third protrusion (34) and the inner wall of the side of the third sliding groove (33) close to the slip (12) are provided with a predetermined distance.

8. The stored-energy injection-production packer of claim 7, wherein, The inner wall of the tail end of the lower locking pipe (104) is threadedly and sealingly connected with the outer wall of the first end of the lower central pipe (105), and the fourth compression assembly (900) comprises a four-stage piston (20), a four-stage hydraulic cylinder (21), a lower rubber cylinder locking ring (22) and a lower thrust ring (23) which are sequentially sleeved on the outer wall of the inner pipe (1). The first end part inner wall of the four-stage hydraulic cylinder (21) is sealingly sleeved with the outer wall of the lower locking pipe (104), the first end part inner wall of the four-stage hydraulic cylinder (21) is also sealingly sleeved with the outer wall of the four-stage piston (20), the outer wall of the four-stage piston (20) is sealingly sleeved with the first end part inner wall of the four-stage hydraulic cylinder (21) and is arranged in space with the tail end part of the lower locking pipe (104), the inner wall of the four-stage piston (20) is sealingly sleeved with the outer wall of the lower central pipe (105), the first end part end wall of the four-stage piston (20), the outer wall of the lower central pipe (105), the tail end part end wall of the lower locking pipe (104) and the first end part inner wall of the four-stage hydraulic cylinder (21) jointly form a compression inner cavity of the fourth compression assembly (900), and the side wall of the inner pipe (1) is provided with a fourth through hole (32) in communication with the compression inner cavity of the fourth compression assembly (900); The outer wall of the tail end part of the four-stage hydraulic cylinder (21) is threadedly sleeved with the inner wall of the first end part of the lower thrust ring (23), the inner wall of the tail end part of the lower thrust ring (23) is sleeved with the outer wall of the lower central pipe (105), and the tail end part of the lower thrust ring (23) is formed in abutment with the first end of the second rubber sealing cylinder (24); The fourth reverse stopping component is a lower rubber sealing cylinder lock ring (22), the inner wall of the lower rubber sealing cylinder lock ring (22) is threadedly sleeved with the outer wall of the central pipe (53) through a one-way sawtooth thread, the outer wall of the lower rubber sealing cylinder lock ring (22) is threadedly sleeved with the inner wall of the first end part of the lower thrust ring (23) through a one-way sawtooth thread, and the lower rubber sealing cylinder lock ring (22) is arranged in space with the tail end part of the four-stage hydraulic cylinder (21).

9. The stored-energy injection packer of claim 8, wherein, The annular cavities are arranged between the inner wall of the upper end part of the second-stage hydraulic cylinder (8) and the outer wall of the upper locking pipe (103) and between the inner wall of the lower end part of the third-stage hydraulic cylinder (17) and the outer wall of the lower locking pipe (104).

10. The stored-energy injection packer of claim 1, wherein, The slip (12) adopts a cylindrical structure, a plurality of annular clamping teeth are arranged in an axial array on the outer wall of both ends of the slip (12), a plurality of split grooves are arranged in a circumferential array and extend in an axial direction on both ends of the slip (12), and the split grooves on both ends of the slip (12) are arranged in a staggered manner.

11. A method of using the stored-energy injection packer according to any one of claims 1-10, characterized in that, Further comprising: The injection and production pipe (100), the sitting joint pipe (300), the shear ball sleeve pipe (400), and the guide lead pipe (500) are sealingly threadedly connected in sequence to form an integral device, and the integral device is lowered into the inner cavity of the wellbore; A steel ball adapted to the sealing sliding sleeve is put into the injection and production pipe (100) to seal the inner cavity of the shear ball sleeve pipe (400), hydraulic medium is injected into the inner cavity of the integral device and pressure is applied, so that the hydraulic medium enters the compression inner cavities of the second compression assembly (700) and the third compression assembly (800), the output ends of the second compression assembly (700) and the third compression assembly (800) are driven to extrude the slip (12), and anchoring is completed; The pressure is continuously increased until the steel ball and the sealing sliding sleeve built in the shear ball seat fall to the bottom of the well, and the installation of the integral device in the inner cavity of the wellbore is completed. ​ When the whole device needs to be recovered, the cutting tool is lowered to cut the sidewall of the inner tube (1) between the tail end of the middle ring block and the non-return component, and the anchor operation of the slips (12) is released; The whole device is lifted to complete the recovery operation.

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