Recoverable large-drift-diameter suspension packer

Abstract

The invention discloses a recoverable large-drift-diameter suspension packer. The recoverable large-drift-diameter suspension packer comprises a pushing body, a sealing body, an anchoring body and a deblocking body which are arranged in sequence. The recoverable large-drift-diameter suspension packer is connected through a matched setting tool, after the packer descends to a preset position, a proper setting ball is put into the setting tool, pushing force is generated through oil pipe pressing and setting tool piston movement to push the pushing barrel to move downwards, and then the rubber barrel, the upper cone, the barrel-shaped slip and the lower cone are driven. The barrel-shaped slips firstly bite the inner wall of the sleeve, and then the rubber sleeve is completely set. The upper end locking ring can continuously keep setting force, and annulus sealing is ensured. In addition, unsealing can be achieved through the action of the unsealing body, and then the packer can be recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field development, and specifically relates to a retrievable large-diameter hanging packer. Background Art

[0002] During the development of oil and gas fields, liner completion can effectively prevent the collapse of the open-hole wellbore, reduce the problems of wellbore sand burial and production channel blockage, and at the same time meet the needs of later sidetracking. The main completion tools for liners are hanging packers and releasing tools. At present, the inner diameter of existing hanging packers is small, which affects the re-entry of drill pipes and the acid fracturing effect in the later stage; the performance of the releasing tool is unreliable, and there is no supporting internal blowout preventer, so the well control risk during the operation of assembling the liner is high. Therefore, a large-diameter hanging packer is needed to meet the requirements of drill pipe re-entry, low well control risk during the operation of assembling the liner, and acid fracturing.

[0003] However, there is still no device in the prior art that can solve the above problems. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a retrievable large-diameter hanging packer. The inner diameter of the packer is large, meeting the requirements of full-bore liner and drill pipe re-entry. The sealing body adopts a structure of "rubber barrel back ring + end rubber barrel + spacer ring + middle rubber barrel + spacer ring + end rubber barrel + rubber barrel back ring". The rubber barrel back ring adopts a bowl structure of a steel bowl. After special heat treatment, it can completely wrap the end rubber barrel after extrusion deformation, making the rubber barrel seal reliable. The one-way locking structure is designed with a unique ratchet lock ring device to maintain the setting force, and the setting force is durable and effective. The anchoring body is designed as a barrel-shaped slip, with a large area of engagement with the casing, high load-bearing capacity, safe and reliable, and can be effectively anchored at any part of the casing. The specific technical solutions are as follows:

[0005] A recyclable large-diameter suspension packer, comprising a central pipe, on the outer peripheral side of which a sealing body and an anchoring body are sequentially sleeved in the upstream to downstream direction. Upstream of the sealing body, there is a pushing body that abuts against the sealing body and is used to compress the sealing body. The compressed sealing body can synchronously drive the anchoring body to expand outwards. A one-way locking structure is arranged between the pushing body and the central pipe so that the pushing body is in a locked state after moving downstream relative to the central pipe. Downstream of the anchoring body, there is a releasing body that abuts against the anchoring body and is sleeved on the outer peripheral side of the central pipe. A release ring is arranged between the releasing body and the outer peripheral side of the corresponding central pipe. A lapping structure that laps to the upstream end face of the release ring is arranged on the releasing body. Matching threads are arranged on the inner peripheral side of the release ring and the outer peripheral side of the corresponding central pipe. A plurality of circumferential grooves are arranged at intervals in the upstream to downstream direction on the outer peripheral side of the release ring. There is also a clamping sleeve, which includes a small-diameter upstream section and a large-diameter downstream section. The small-diameter upstream section is placed between the releasing body and the release ring, and a plurality of circumferential protrusions corresponding to the circumferential grooves are arranged on the inner peripheral side of the small-diameter upstream section relative to the release ring. The large-diameter downstream section is sleeved on the inner peripheral side of the releasing body. There is a gap between the release ring and the large-diameter downstream section. The large-diameter downstream section protrudes from the downstream end of the central pipe. A clamping portion is arranged on the inner side wall of the protruding large-diameter downstream section for a releasing tool to be clamped, so that when the releasing tool is lifted, an upward force can be applied to the clamping sleeve in the upstream direction. A clamping step is arranged on the outer peripheral side of the central pipe upstream of the release ring. A clamping boss matching the clamping step is arranged on the inner peripheral side of the releasing body. A distance is arranged between the clamping step and the clamping boss, and this distance is set so that after the releasing body moves downstream, the anchoring body cannot be anchored to the casing and the sealing body cannot be sealed to the casing. This recyclable large-diameter suspension packer has an initial state, a set state, and a releasing state;

[0006] In the initial state, the pushing body is connected to the central pipe by an upstream shear pin. The sealing body is in a natural state. The anchoring body is in a natural state and is connected to the central pipe by a middle shear pin. The plurality of circumferential protrusions squeeze the non-circumferential grooves on the outer peripheral side of the release ring, so that the squeezed release ring is threadedly connected to the central pipe. The releasing body is in a fixed state by lapping on the release ring. The releasing body is connected to the clamping sleeve by a downstream shear pin;

[0007] When transitioning from the initial state to the set state, the pushing body moves in the downstream direction, causing the upstream shear pin and the midstream shear pin to be sheared. The unsealing body is in the fixed state and abuts against the downstream of the anchoring body. As a result, the sealing body, which is given a thrust by the pushing body, is compressed and expands outward. The anchoring body, which is driven synchronously, also expands outward. This causes the anchoring body to bite onto the inner wall of the casing, and after the sealing body expands outward, it abuts against the inner wall of the casing to complete the setting. The set state is maintained by the one-way locking structure.

[0008] When transitioning from the set state to the unsealing state, the unsealing tool engages with the clamping sleeve. When the unsealing tool is lifted, it applies a force in the upstream direction to the clamping sleeve, causing the downstream shear pin to be sheared and then lifting the clamping sleeve. The plurality of circumferential protrusions are respectively located in the circumferential grooves, causing the release ring to expand outward. As a result, the threaded connection between the release ring and the central tube is released. This causes the release ring, along with the unsealing body that is lapped on the release ring, to move in the downstream direction, causing the anchoring body to retract and thus release the anchoring with the casing, and the sealing body to retract and thus release the sealing with the casing.

[0009] Preferably, the sealing body is a rubber cylinder. The upstream and downstream of the rubber cylinder respectively abut against the upper rubber cylinder protective sleeve and the lower rubber cylinder protective sleeve sleeved on the outer periphery of the central tube. The upstream of the upper rubber cylinder protective sleeve is threadedly connected to the lock ring seat sleeved on the outer periphery of the central tube. The upstream of the lock ring seat is threadedly connected to a push cylinder. The outer periphery of the upstream end of the central tube is threadedly connected to an upper joint. A part of the downstream section of the push cylinder is sleeved on the outer periphery of the upper joint. The push cylinder, the lock ring seat, and the upper rubber cylinder protective sleeve form the pushing body. The upstream shear screw includes a first shear screw and a second shear screw. The push cylinder is connected to the upper joint through the first shear screw. The upper rubber cylinder protective sleeve is connected to the central tube through the second shear screw. The one-way locking structure is arranged between the lock ring seat and the central tube.

[0010] Preferably, a lock ring is fixed to the inner side of the lock ring seat by a screw. Matching ratchet teeth are provided on the inner side wall of the lock ring and the outer side wall of the corresponding central tube to form the one-way locking structure.

[0011] Preferably, the anchoring body is a barrel-shaped slip. An upper cone and a lower cone sleeving on the outer periphery of the central tube are respectively arranged upstream and downstream of the barrel-shaped slip. The tip of the upper cone faces the downstream direction and extends into the space between the barrel-shaped slip and the central tube. The tip of the lower cone faces the upstream direction and extends into the space between the barrel-shaped slip and the central tube. The upper cone is located downstream of the lower protective sleeve of the rubber cylinder and is connected to the latter by threads. The releasing body includes the lower cone. The releasing body further includes a limiting sleeve, a connecting outer sleeve, and a shear sliding sleeve. A stepped structure is formed at the downstream end of the lower cone. The stepped structure includes an upper step surface, a lower step surface, and a vertical surface between the two. The limiting sleeve is located downstream of the lower cone and is threadedly connected to the vertical surface of the lower cone. The upper step surface forms the clamping boss. The connecting outer sleeve is located downstream of the limiting sleeve and is threadedly connected to the limiting sleeve. An outward expansion section is arranged on the outer periphery of the central tube corresponding to the middle section of the connecting outer sleeve. The upstream end surface of the outward expansion section forms the clamping step. The shear sliding sleeve is located downstream of the connecting outer sleeve and is threadedly connected to the connecting outer sleeve. The shear sliding sleeve is located on the outer periphery of the clamping sleeve. The clamping sleeve and the shear sliding sleeve are connected by the downstream shear pin.

[0012] Preferably, an embedding groove is formed on the outward expansion section for clamping a C-ring. A step is formed on the inner periphery of the limiting sleeve corresponding to the distance between the clamping step and the clamping boss. The inner diameter of the limiting sleeve at the upstream of the step is larger than the inner diameter of the limiting sleeve at the downstream of the step.

[0013] Preferably, a lower sub is further included. The downstream section of the shear sliding sleeve is threadedly connected to the outer periphery of the lower sub. A step is formed at the upstream end of the lower sub for abutting against the large-diameter downstream section of the clamping sleeve.

[0014] Preferably, an O-ring backing ring and an O-ring are arranged at the docking position between the large-diameter downstream section and the lower sub to form a sealing structure.

[0015] Preferably, an O-ring backing ring and an O-ring are arranged at the docking position between the large-diameter downstream section and the central tube to form a sealing structure.

[0016] Preferably, the rubber cylinder is composed of steel bowls, end rubber cylinders, spacer rings, middle rubber cylinders, spacer rings, end rubber cylinders, and steel bowls connected in sequence along the upstream and downstream directions.

[0017] Preferably, internal threads are provided on the inner periphery of the upper sub.

[0018] The technical effects brought by this technical solution:

[0019] The recyclable large-diameter suspension packer is connected through a matching setting tool. The pusher of the setting tool is located upstream of the packer, rather than on the outer peripheral side of the central tube. The large-diameter effect is achieved through this specific setting and the release body. When in use, after reaching the predetermined position, a suitable setting ball is put into the setting tool. By pressurizing the oil pipe, the piston of the setting tool moves, generating thrust to push the pusher downward, thereby driving the rubber cylinder, upper cone, barrel slip, and lower cone. The barrel slip bites the inner wall of the casing first, and then the rubber cylinder is completely set. The one-way locking structure can continuously maintain the setting force to ensure the annular sealing. There are two types of setting tools, one with an annular release and the other without an annular release. The setting tool with an annular release can cut off the upstream shear pin by pressurizing the upper annulus, and the release claw falls off the setting tool to achieve release; both setting tools can achieve release by mechanical means. When unsealing, a special unsealing tool is lowered, anchored above the packer, and the tubing is lifted. The downstream shear pin is sheared off by over-lifting tonnage, and the release ring and the clamping sleeve are relatively displaced. The barrel slip is recovered, the rubber cylinder is retracted, and the lifting is continued to achieve the recovery of the packer after unsealing.

[0020] As a preferred choice, the rubber material of the rubber cylinder is AFLAS, which can meet the temperature and pressure resistance of 204°C and 15,000psi through appropriate hardness configuration. The back ring of the rubber cylinder adopts a bowl-shaped structure, which has undergone special heat treatment. After extrusion and deformation, it can completely wrap the end rubber cylinder, making the rubber cylinder seal reliable.

[0021] As a preferred method, the slip material of the barrel slip is carburized steel, which has been specially heat treated to improve its surface hardness and can be applied to casings of 140 steel grade and below. The slip adopts a barrel structure, and after hanging, it has a large area for biting the casing, can bear a high load, and has little damage to the casing. Through cooperation with the slip slide, its matching slope can effectively help the recovery of the slip.

[0022] Preferably, the C-shaped ring is provided to prevent the lower cone from being locked with the barrel cava during recovery, which would cause the lower end of the barrel cava to be unable to retract and be lifted up to unseal it. Then, a downward pressing action can be performed, and the lower cone can be driven downward by the C-shaped ring, and then the lower end of the barrel cava retracts.

[0023] Preferably, all parts of the unsealing body are treated with a special coating, which has a self-lubricating effect and protects the steel parts from corrosion in the underground environment for a long time, reduces the resistance of the parts during movement, and makes the unsealing action smoother.

[0024] As a preference, the push tube is made of easy-to-drill material to shorten the subsequent milling time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic structural diagram of a specific implementation of a retrievable large-diameter suspension packer provided by the present invention.

[0026] Figure 1 The accompanying reference numerals are as follows:

[0027] 1 central tube, 2 release ring, 3 circumferential card slot, 4 clamping sleeve, 5 small-diameter upstream section, 6 large-diameter downstream section, 7 circumferential protrusion, 8 gap, 9 clamping portion, 10 clamping step, 11 clamping boss, 12 rubber cylinder, 13 upper protective sleeve of rubber cylinder, 14 lower protective sleeve of rubber cylinder, 15 lock ring seat, 16 push cylinder, 17 upper joint, 18 first shear screw, 19 second shear screw, 20 lock ring, 21 barrel-shaped slip, 22 upper cone, 23 lower cone, 24 limit sleeve, 25 connecting outer sleeve, 26 shear sliding sleeve, 27 outer expansion section, 28 middle-stream shear pin, 29 downstream shear pin, 30 C-ring, 31 step, 32 lower joint, 33 back ring of O-ring, 34 O-ring, 35 slip body of slip, 36 internal hexagonal flat-end set screw, 37 internal hexagonal socket head screw, 38 third shear pin, 39 shear ring, 40 key block. Detailed implementation manners

[0028] To solve the above technical problems, the present invention provides a recyclable large-diameter hanging packer, which includes a central pipe 1. A sealing body and an anchoring body are sequentially sleeved on the outer peripheral side of the central pipe 1 in the upstream to downstream direction. A pushing body that abuts against the sealing body and is used to compress the sealing body is arranged upstream of the sealing body. The compressed sealing body can synchronously drive the anchoring body to expand outwards. A one-way locking structure is arranged between the pushing body and the central pipe 1 so that the pushing body is in a locked state after moving downstream relative to the central pipe 1. A releasing body that abuts against the anchoring body and is sleeved on the outer peripheral side of the central pipe 1 is arranged downstream of the anchoring body. A release ring 2 is arranged between the releasing body and the outer peripheral side of the central pipe 1 opposite to it. A lapping structure that laps to the upstream end face of the release ring 2 is arranged on the releasing body. Matching threads are arranged on the inner peripheral side of the release ring 2 and the outer peripheral side of the corresponding central pipe 1. A plurality of circumferential grooves 3 are arranged at intervals on the outer peripheral side of the release ring 2 in the upstream to downstream direction. A clamping sleeve 4 is also included, which includes a small-diameter upstream section 5 and a large-diameter downstream section 6. The small-diameter upstream section 5 is placed between the releasing body and the release ring 2, and a plurality of circumferential protrusions 7 corresponding to the circumferential grooves 3 are arranged on the inner peripheral side of the small-diameter upstream section 5 relative to the release ring 2. The large-diameter downstream section 6 is sleeved on the inner peripheral side of the releasing body. There is a gap 8 between the release ring 2 and the large-diameter downstream section 6. The large-diameter downstream section 6 protrudes from the downstream end of the central pipe 1. A clamping portion 9 is arranged on the inner side wall of the protruding large-diameter downstream section 6 for a releasing tool to be clamped so that when the releasing tool is lifted, an upward force can be applied to the clamping sleeve 4. A clamping step 10 is arranged on the outer peripheral side of the central pipe 1 upstream of the release ring 2. A clamping boss 11 matching the clamping step 10 is arranged on the inner peripheral side of the releasing body. There is a distance between the clamping step 10 and the clamping boss 11, and this distance is set so that after the releasing body moves downstream, the anchoring body is not anchored to the casing and the sealing body is not sealed to the casing. The recyclable large-diameter hanging packer has an initial form, a set form and a releasing form;

[0029] In a specific embodiment, the clamping portion 9 includes an annular protrusion protruding from the inner side wall of the large-diameter downstream section 6.

[0030] In the initial form, the pushing body is connected to the central pipe 1 through an upstream shear pin. The sealing body is in a natural state. The anchoring body is in a natural state and is connected to the central pipe 1 through a middle shear pin 28. The plurality of circumferential protrusions 7 squeeze the non-circumferential groove on the outer peripheral side of the release ring 2 so that the squeezed release ring 2 is threadedly connected to the central pipe 1. The releasing body is in a fixed state by lapping on the release ring 2. The releasing body and the clamping sleeve 4 are connected through a downstream shear pin 29;

[0031] When changing from the initial state to the set state, the pusher moves downstream, causing the upstream shear pin and the midstream shear pin 28 to be sheared. The release body is in the fixed state and abuts against the downstream of the anchor body. The sealing body, which is given a thrust by the pusher, is compressed and expanded outward. The anchor body, which is driven synchronously, expands outward, causing the anchor body to bite the inner wall of the casing and the sealing body to expand outward and abut against the inner wall of the casing to complete setting. The set state is maintained by the one-way locking structure.

[0032] When changing from the set state to the release state, the release tool engages with the coupling sleeve 4. When the release tool is lifted, a force in the upstream direction is applied to the coupling sleeve 4, causing the downstream shear pin 29 to be sheared and then lifting the coupling sleeve 4. The plurality of circumferential protrusions 7 are respectively located in the circumferential grooves 3, causing the release ring 2 to expand outward. Then, the release ring 2 releases the threaded connection with the central tube 1, causing the release ring 2 and the release body lapped on the release ring 2 to move downstream, causing the anchor body to retract and release the anchoring with the casing, and the sealing body to retract and release the sealing with the casing.

[0033] As Figure 1 shown, in a specific embodiment, the sealing body is a rubber cylinder 12. The upstream and downstream of the rubber cylinder 12 respectively abut against a rubber cylinder upper protective sleeve 13 and a rubber cylinder lower protective sleeve 14 sleeved on the outer peripheral side of the central tube 1. The upstream of the rubber cylinder upper protective sleeve 13 is threadedly connected to a lock ring seat 15 sleeved on the outer peripheral side of the central tube 1. The upstream of the lock ring seat 15 is threadedly connected to a push cylinder 16. The outer peripheral side of the upstream end of the central tube 1 is threadedly connected to an upper joint 17. A part of the downstream section of the push cylinder 16 is sleeved on the outer peripheral side of the upper joint 17. The push cylinder 16, the lock ring seat 15, and the rubber cylinder upper protective sleeve 13 form the pusher. The upstream shear screw includes a first shear screw 18 and a second shear screw 19. The push cylinder 16 is connected to the upper joint 17 through the first shear screw 18. The rubber cylinder upper protective sleeve 13 is connected to the central tube 1 through the second shear screw 19. A one-way locking structure is provided between the lock ring seat 15 and the central tube 1. The upstream shear screw further includes a third shear screw 38, which passes through the upper cone 22, the central tube 1, and a shear ring 39 located between the two.

[0034] In this specific embodiment, as Figure 1 shown, a lock ring 20 is fixed to the inside of the lock ring seat 15 by a screw. Matching ratchet teeth are provided on the inner side wall of the lock ring 20 and the outer side wall of the corresponding central tube 1 to form the one-way locking structure. Among them, the lock ring seat 15 and the lock ring 20 are fixed by an inner hexagon socket head screw 37.

[0035] In a specific embodiment, as Figure 1 shown, the anchoring body is a barrel-shaped slip 21. An upper cone 22 and a lower cone 23 sleeving the outer peripheral side of the central pipe 1 are respectively arranged at the upstream and downstream of the barrel-shaped slip 21. The tip of the upper cone 22 faces the downstream direction and extends into the space between the barrel-shaped slip 21 and the central pipe 1. The tip of the lower cone 23 faces the upstream direction and extends into the space between the barrel-shaped slip 21 and the central pipe 1. The upper cone 22 is located downstream of the rubber sleeve lower protective sleeve 14 and the two are connected by threads. The releasing body includes the lower cone 23. The releasing body further includes a limit sleeve 24, a connecting outer sleeve 25, and a shear sliding sleeve 26. A step structure is formed at the downstream end of the lower cone 23. The step structure includes an upper step surface, a lower step surface, and a vertical surface between the two. The limit sleeve 24 is located downstream of the lower cone 23 and is threadedly connected to the vertical surface of the lower cone 23. The upper step surface forms the clamping boss 11. The connecting outer sleeve 25 is located downstream of the limit sleeve 24 and is threadedly connected to the limit sleeve 24. An outward expansion section 27 is arranged on the outer peripheral side of the central pipe 1 corresponding to the middle section of the connecting outer sleeve 25. The upstream end surface of the outward expansion section 27 forms the clamping step 10. The shear sliding sleeve 26 is located downstream of the connecting outer sleeve 25 and is threadedly connected to the connecting outer sleeve 25. The shear sliding sleeve 26 is located on the outer peripheral side of the clamping sleeve 4. The clamping sleeve 4 and the shear sliding sleeve 26 are connected by the downstream shear pin 29.

[0036] The retrievable large-diameter hanging packer is connected through a matching setting tool. The pushing body of the setting tool is located upstream of the packer, rather than being arranged on the outer peripheral side of the central pipe 1. Through this specific setting, the large-diameter effect is achieved with the releasing body. During use, after reaching the predetermined position, a suitable setting ball is put into the setting tool. Through tubing pressure, the piston of the setting tool moves, generating a thrust to push the pushing body to move downward, thereby driving the rubber sleeve 12, the upper cone 22, the barrel-shaped slip 21, and the lower cone 23. The barrel-shaped slip 21 first bites the inner wall of the casing, and then the rubber sleeve 12 is fully set. The one-way locking structure can continuously maintain the setting force to ensure the annulus seal. There are two types of setting tools: those with annulus releasing and those without annulus releasing. The setting tool with annulus releasing can cut the upstream shear pin through annulus pressure, and the releasing claw falls off the setting tool to achieve releasing; both types of setting tools can achieve releasing mechanically. During releasing, by lowering a special releasing tool and anchoring it above the packer, lifting the pipe string, the downstream shear pin 29 is cut off by overpull tonnage, the relative displacement between the releasing ring 2 and the clamping sleeve 4 occurs, the barrel-shaped slip 21 is recovered, the rubber sleeve 12 retracts, and by continuing to overpull, the packer can be retrieved after releasing.

[0037] In a specific embodiment, an embedded groove is formed on the expansion section 27 for a C-shaped ring 30 to engage, and a step 31 is formed on the inner circumference of the limit sleeve 24 at the interval between the engaging step 10 and the engaging boss 11, and the inner diameter of the limit sleeve at the upstream of the step 31 is larger than the inner diameter of the limit sleeve at the downstream of the step 31. The provision of the C-shaped ring 30 can prevent the lower cone 23 from locking with the barrel slip 21 during recovery, causing the lower end of the barrel slip 21 to be unable to retract, and unable to be lifted up to unseal, so that a downward pressing action can be performed, and the lower cone 23 is driven downward by the C-shaped ring 30, and then the lower end of the barrel slip 21 retracts.

[0038] In a specific embodiment, the barrel-shaped cava 21 is provided with a slideway extending along its axial direction, and also includes a cava slide 35, which is fixed to the center tube 1 by a fixing screw, and the cava slide 35 is located in the slideway, and the fixing screw is a hexagonal flat-end set screw 36.

[0039] like Figure 1 As shown, a lower joint 32 is also included, the downstream section of the shear sleeve 26 is threadedly connected to the outer peripheral side of the lower joint 32, and the upstream end of the lower joint 32 forms a step for the large-diameter downstream section 6 of the clamping sleeve 4 to abut.

[0040] In a specific embodiment, an O-ring backing ring 33 and an O-ring 34 are provided at the relative connection position between the large diameter downstream section 6 and the lower joint 32 to form a sealing structure. An O-ring backing ring 33 and an O-ring 34 are provided at the relative connection position between the large diameter downstream section 6 and the central pipe 1 to form a sealing structure.

[0041] In a specific implementation, the rubber cylinder 12 comprises a steel bowl, an end rubber cylinder, a spacer ring, a middle rubber cylinder, a spacer ring, an end rubber cylinder, and a steel bowl which are sequentially connected in an upstream and downstream direction.

[0042] In a specific implementation manner, the inner circumference of the upper joint 17 is provided with an internal thread.

[0043] In a specific implementation manner, Figure 1 As shown, it also includes a key block 40, which is arranged at the relative position of the lower cone 23, the limiting sleeve 24 and the central tube 1. A sliding groove relative to the key block is arranged on the central tube, which is located on the outer peripheral side of the central tube opposite to the limiting sleeve.

Claims

1. A recyclable large-diameter hanging packer, characterized in that, It includes a central pipe. A sealing body and an anchoring body are sequentially sleeved on the outer peripheral side of the central pipe along the upstream to downstream direction. A pushing body that abuts against the sealing body and is used to compress the sealing body is arranged upstream of the sealing body. The compressed sealing body can synchronously drive the anchoring body to expand outwards. A one-way locking structure is arranged between the pushing body and the central pipe so that the pushing body is in a locked state after moving downstream relative to the central pipe. A releasing body that abuts against the downstream of the anchoring body and is sleeved on the outer peripheral side of the central pipe is arranged downstream of the anchoring body. A release ring is arranged between the releasing body and the outer peripheral side of the corresponding central pipe. A lapping structure that laps to the upstream end face of the release ring is arranged on the releasing body. Matching threads are arranged on the inner peripheral side of the release ring and the outer peripheral side of the corresponding central pipe. A plurality of circumferential card slots are arranged at intervals along the upstream to downstream direction on the outer peripheral side of the release ring. It also includes a clamping sleeve, which includes a small-diameter upstream section and a large-diameter downstream section. The small-diameter upstream section is placed between the releasing body and the release ring, and a plurality of circumferential protrusions corresponding to the circumferential card slots are arranged on the inner peripheral side of the small-diameter upstream section relative to the release ring. The large-diameter downstream section is sleeved on the inner peripheral side of the releasing body. There is a gap between the release ring and the large-diameter downstream section. The large-diameter downstream section protrudes from the downstream end of the central pipe. A clamping portion is arranged on the inner side wall of the protruding large-diameter downstream section for a releasing tool to be clamped so that when the releasing tool is lifted, an upward force can be applied to the clamping sleeve in the upstream direction. A clamping step is arranged on the outer peripheral side of the central pipe upstream of the release ring. A clamping boss matching the clamping step is arranged on the inner peripheral side of the releasing body. There is a distance between the clamping step and the clamping boss, and this distance is set so that after the releasing body moves downstream, the anchoring body is not anchored to the casing and the sealing body is not sealed to the casing. This retrievable large-diameter hanging packer has an initial form, a set form, and a releasing form; In the initial form, the pushing body is connected to the central pipe through an upstream shear pin. The sealing body is in a natural state. The anchoring body is in a natural state and is connected to the central pipe through a midstream shear pin. The plurality of circumferential protrusions squeeze the non-circumferential card slots on the outer peripheral side of the release ring, so that the squeezed release ring is threadedly connected to the central pipe. The releasing body is in a fixed state by lapping on the release ring. The releasing body and the clamping sleeve are connected through a downstream shear pin; When changing from the initial form to the set form, the pushing body moves downstream, causing the upstream shear pin and the midstream shear pin to be sheared. The releasing body is in the fixed state and abuts against the downstream of the anchoring body. The sealing body, which is given a thrust by the pushing body, is compressed and expands outwards. The anchoring body driven synchronously expands outwards, so that the anchoring body bites the inner wall of the casing and the sealing body expands outwards and abuts against the inner wall of the casing to complete the setting, and the set form is maintained through the one-way locking structure; When transitioning from the set state to the unsealing state, the unsealing tool engages with the clamping sleeve such that when the unsealing tool is lifted, an upward force is exerted on the clamping sleeve in the upstream direction, causing the downstream shear pin to be cut, thereby lifting the clamping sleeve. The plurality of circumferential protrusions are respectively located in the circumferential grooves, causing the release ring to expand outward, and further causing the release ring to disengage from the threaded connection with the central tube. As a result, the release ring, along with the unsealing body lapped on the release ring, moves in the downstream direction, causing the anchoring body to retract, thereby releasing the anchoring with the casing, and the sealing body to retract, thereby releasing the seal with the casing.

2. The recyclable large-diameter suspension packer according to claim 1, wherein, The sealing body is a rubber cylinder. The upstream and downstream of the rubber cylinder respectively abut against the upper rubber cylinder protective sleeve and the lower rubber cylinder protective sleeve sleeved on the outer periphery of the central tube. The upstream of the upper rubber cylinder protective sleeve is threadedly connected to a lock ring seat sleeved on the outer periphery of the central tube. The upstream of the lock ring seat is threadedly connected to a push cylinder. The outer periphery of the upstream end of the central tube is threadedly connected to an upper joint. A part of the downstream section of the push cylinder is sleeved on the outer periphery of the upper joint. The push cylinder, the lock ring seat, and the upper rubber cylinder protective sleeve form the pushing body. The upstream shear screws include a first shear screw and a second shear screw. The push cylinder is connected to the upper joint through the first shear screw. The upper rubber cylinder protective sleeve is connected to the central tube through the second shear screw. A one-way locking structure is provided between the lock ring seat and the central tube.

3. The retrievable large-diameter suspension packer according to claim 2, wherein A lock ring is fixed to the inner side of the lock ring seat by a screw. Matching ratchet teeth are provided on the inner side wall of the lock ring and the outer side wall of the corresponding central tube to form the one-way locking structure.

4. The recyclable large-diameter suspension packer according to claim 2, wherein The anchoring body is a barrel-shaped slip. The upstream and downstream of the barrel-shaped slip are respectively provided with an upper cone and a lower cone sleeved on the outer periphery of the central tube. The tip of the upper cone faces downstream and extends between the barrel-shaped slip and the central tube. The tip of the lower cone faces upstream and extends between the barrel-shaped slip and the central tube. The upper cone is located downstream of the lower rubber cylinder protective sleeve and is threadedly connected to it. The unsealing body includes the lower cone. The unsealing body also includes a limit sleeve, a connecting outer sleeve, and a shear sliding sleeve. A stepped structure is formed at the downstream end of the lower cone. The stepped structure includes an upper stepped surface, a lower stepped surface, and a vertical surface between them. The limit sleeve is located downstream of the lower cone and is threadedly connected to the vertical surface of the lower cone. The upper stepped surface forms the clamping boss. The connecting outer sleeve is located downstream of the limit sleeve and is threadedly connected to the limit sleeve. An outward expansion section is provided on the outer periphery of the central tube corresponding to the middle section of the connecting outer sleeve. The upstream end face of the outward expansion section forms the clamping step. The shear sliding sleeve is located downstream of the connecting outer sleeve and is threadedly connected to the connecting outer sleeve. The shear sliding sleeve is located on the outer periphery of the clamping sleeve. The clamping sleeve and the shear sliding sleeve are connected by the downstream shear pin. The downstream end face of the connecting outer sleeve forms the lapping structure.

5. The recyclable large-diameter suspension packer according to claim 3, wherein An embedding groove is formed on the externally expanded section for clamping a C-ring. A step is formed on the inner peripheral side of the limit sleeve corresponding to the distance between the clamping step and the clamping boss. The inner diameter of the limit sleeve at the upstream of this step is larger than the inner diameter of the limit sleeve at the downstream of this step.

6. The recyclable large-diameter suspension packer according to claim 3, wherein, It further includes a lower joint. The downstream section of the shear sliding sleeve is threadedly connected to the outer peripheral side of the lower joint. A step is formed at the upstream end of the lower joint for the large-diameter downstream section of the clamping sleeve to abut against.

7. The recyclable large-diameter suspension packer according to claim 5, characterized in that, An O-ring back ring and an O-ring are arranged at the docking position of the large-diameter downstream section and the lower joint to form a sealing structure.

8. The recyclable large-diameter suspension packer according to claim 3, wherein, An O-ring back ring and an O-ring are arranged at the docking position of the large-diameter downstream section and the central tube to form a sealing structure.

9. The recyclable large-diameter suspension packer according to claim 3, characterized in that, A slideway extending along its axial direction is formed on the barrel-shaped slip. It further includes a slip slide body, which is fixed to the central tube by a fixing screw and is located in the slideway.

10. The recyclable large-diameter suspension packer according to claim 3, characterized in that, The rubber cylinder is composed of a steel bowl, an end rubber cylinder, a spacer ring, an intermediate rubber cylinder, a spacer ring, an end rubber cylinder, and a steel bowl that are sequentially connected in the upstream and downstream directions.

11. The retrievable large-diameter suspension packer according to claim 3, wherein Internal threads are provided on the inner peripheral side of the upper joint.

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