A one-piece, bi-directionally anchored, unsealable packer and running and setting tool

Abstract

The application provides a whole bidirectional anchoring releasable packer and running and setting tool, relates to the technical field of downhole tools of oil and gas wells, and solves the technical problem of poor process correlation of the setting operation of the packer in the prior art, which is single pressure control or mechanical unlocking mode. The device comprises a packer, a setting tool and a recovery tool. The setting tool is used for setting the packer in a casing by a first preset pressure and completing the releasing operation from the packer by a second preset pressure. The recovery tool is used for extending into the casing and cooperating with the set packer to recover the packer. The acting force of the setting tool can push the anchoring mechanism to open and anchor on the inner wall of the casing, and compress the composite sealing mechanism to make it radially expand and adhere to the inner wall of the casing to form an annular seal. The recovery tool can be linked to unlock the one-way locking mechanism, and simultaneously release the anchoring state of the anchoring mechanism and the sealing state of the composite sealing mechanism.

Description

Technical Field

[0001] This invention relates to the field of downhole tools for oil and gas wells, and in particular to an integrally bidirectional anchored releaseable packer and its delivery and setting tool. Background Technology

[0002] In oil and gas drilling, completion, and downhole operations, packers are the core tools for achieving annular sealing, layer separation, and pressure isolation. They are widely used in water shut-off, staged fracturing, stratified oil production, and casing leak detection. Their anchoring stability, sealing reliability, and ease of unsealing and recovery directly affect the success rate and safety of downhole operations.

[0003] Existing conventional packers mostly adopt a unidirectional anchoring structure, which has poor adaptability to complex high-pressure well conditions. During operation, the packer is susceptible to the impact of high-pressure fluid in the well and the axial creep of the tubing string, resulting in anchoring slippage and tubing string movement, which in turn leads to setting failure, annular leakage, and other problems such as reduced accuracy of stratified operations and construction failure, failing to meet the requirements of high-load downhole operations.

[0004] Meanwhile, the existing designs for setting, releasing, and unsealing processes of recyclable packers are imperfect, mostly relying on single pressure control or mechanical unlocking methods. These processes suffer from poor interrelationships, low control precision, and are prone to malfunctions such as accidental release, incomplete setting, and unsealing jamming. In traditional structures, the anchoring and sealing mechanisms operate independently, resulting in poor locking stability. Under downhole stress, the packer is prone to retraction and slip detachment, and the anchoring and sealing states cannot be released simultaneously. This leads to cumbersome recovery procedures, low operational efficiency, and high construction costs.

[0005] Furthermore, conventional packers lack a reliable one-way locking linkage structure, resulting in insufficient structural locking stability after setting and a tendency to loosen and fail under long-term pressure. Additionally, the compatibility between the retrieval tool and the packer is poor, making precise synchronous unlocking difficult, increasing the challenge of tool retrieval, and leading to downhole retention failures, thus increasing well workover costs and operational risks.

[0006] In summary, existing packers suffer from numerous drawbacks, including poor anchoring and sealing stability, low setting and release accuracy, cumbersome unlocking and recovery processes, and the inability to unlock synchronously. These limitations make them unsuitable for complex operating conditions such as deep wells and high pressure environments. Therefore, there is an urgent need to develop a packer system with bidirectional anchoring, precise pressure-controlled setting and release, and synchronous unlocking and recovery capabilities to address the shortcomings of existing technologies. Summary of the Invention

[0007] The purpose of this invention is to provide a resealable packer with overall bidirectional anchoring and a feeding and setting tool, to solve the technical problem that the setting operation of existing packers mostly uses single pressure control or mechanical unlocking methods, resulting in poor process correlation. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] The present invention provides an integrally bidirectional anchored releaseable packer and a delivery and setting tool, comprising a packer, a setting tool and a retrieval tool, wherein the setting tool uses a first preset pressure to set the packer in the sleeve and uses a second preset pressure to release the packer, and the first preset pressure is less than the second preset pressure. The retrieval tool is used to extend into the sleeve and dock with the set packer to retrieve the packer; The packer includes a central tube assembly, an anchoring mechanism, a composite sealing mechanism, and a one-way locking mechanism. The anchoring mechanism and the composite sealing mechanism are both sleeved on the outer wall of the central tube assembly, and the anchoring mechanism and the composite sealing mechanism are both locked to the central tube assembly by the one-way locking mechanism. The force of the setting tool can push the anchoring mechanism to open and anchor to the inner wall of the sleeve, while compressing the composite sealing mechanism to make it expand radially and fit against the inner wall of the sleeve to form an annular seal; The recycling tool can unlock the one-way locking mechanism in conjunction with the release of the anchoring mechanism and the sealing state of the composite sealing mechanism.

[0010] Optionally, the anchoring mechanism includes an upper cone, a lower cone, and a barrel-shaped slip, wherein the upper cone and the lower cone are both fitted onto the outer wall of the central tube assembly, and the barrel-shaped slip is fitted onto the respective locking sections of the upper cone and the lower cone; The one-way locking mechanism includes a first one-way locking structure, wherein the inner wall of the upper cone and the outer wall of the central tube assembly are locked together by the first one-way locking structure.

[0011] Optionally, at least one annular protrusion is provided on the circumferential outer wall of the snap-fit ​​section of both the upper cone and the lower cone. The side of the annular protrusion facing the center of the barrel-shaped latch is set as a first wedge-shaped inclined surface, and the side of the annular protrusion opposite to the first wedge-shaped inclined surface is set as a first snap-fit ​​inclined surface. The inclination angle of the first wedge-shaped inclined surface is smaller than the inclination angle of the first snap-fit ​​inclined surface. The circumferential outer wall of the middle region of both the upper and lower cones is provided with an opening slope.

[0012] Optionally, the barrel-shaped tile includes multiple strip tiles, all of which are connected end to end in sequence and evenly distributed along the circumferential direction to form a barrel-shaped structure; There is a gap between two adjacent strip tiles, and the outer wall of the strip tile is provided with a first one-way tooth, a second one-way tooth and a central groove, with the central groove located between the first one-way tooth and the second one-way tooth; The inner wall of the strip-shaped tile is provided with at least two locking grooves, and the annular protrusion can be locked into the locking grooves; The side of the snap-fit ​​groove facing the center of the strip tile is configured as a second wedge-shaped slope, and the side of the snap-fit ​​groove facing the end of the strip tile is configured as a second snap-fit ​​slope.

[0013] Optionally, the composite sealing mechanism includes an upper connecting cylinder, a lower connecting cylinder, and multiple rubber sleeves. The upper connecting cylinder, all the rubber sleeves, and the lower connecting cylinder are stacked sequentially along the axial direction, and the other end of the lower connecting cylinder abuts against the end of the upper cone. The one-way locking mechanism includes a second one-way locking structure, through which the inner wall of the upper connecting cylinder and the outer wall of the central tube assembly are locked together.

[0014] Optionally, the central tube assembly includes an upper cap, a first central tube, an upper connector, a first connecting sleeve, a second connecting sleeve, a third connecting sleeve, and a release ring gasket. The upper cap is fitted onto the upper connector, and the end of the upper cap abuts against the composite sealing mechanism. The upper connector, the first central tube, the first connecting sleeve, the second connecting sleeve, and the third connecting sleeve are connected in sequence. The first connecting sleeve abuts against the lower cone, and the release ring gasket is slidably connected to the inner wall of the lower end of the central tube assembly. The one-way locking mechanism includes a third one-way locking structure, wherein the inner wall of the first connecting sleeve and the outer wall of the lower end of the central tube assembly are locked together by the third one-way locking structure. The lower end of the first central tube is provided with multiple first opening grooves along the circumferential direction; The inner wall of the upper connector is provided with a third unidirectional tooth.

[0015] Optionally, the setting tool includes a connector cylinder, a three-piston structure, a release mechanism, and a ball seat structure. The connector cylinder, the three-piston structure, the release mechanism, and the ball seat structure are connected in sequence. The three-piston structure can be connected to the upper cap. The release mechanism can extend into the upper connector and can be locked to the upper connector.

[0016] Optionally, the three-piston structure includes a second central tube, a first-stage piston barrel, a first-stage piston pusher, a second-stage piston barrel, a second-stage piston pusher, a third-stage piston barrel, a third-stage piston pusher, a support tube, and a movable pusher. The connector tube, the first-stage piston barrel, the second-stage piston barrel, the third-stage piston barrel, and the support tube are sequentially connected and form a piston ring cavity with the second central tube. The first-stage piston pusher, the second-stage piston pusher, the third-stage piston pusher, and the movable pusher are sequentially sleeved on the second central tube and can slide along the axial direction of the second central tube. The first-stage piston pusher, the second-stage piston pusher, and the third-stage piston pusher are all located in the piston ring cavity. The outer wall of the movable pusher is slidably connected to the inner wall of the support tube. The end of the movable pusher can be connected to the upper cap. The inner wall of the movable pusher is slidably connected to the release structure. The second central tube has multiple first flow holes and multiple second flow holes on its side wall.

[0017] Optionally, the release structure includes a guide cylinder, a spring seat, a spring, a release cylinder, and a ratchet tooth sleeve. The guide cylinder is connected to the second central tube through the spring seat. The outer wall of the spring seat is slidably connected to the inner wall of the movable push cylinder. The release cylinder is slidably connected to the guide cylinder, and a hydraulic annular cavity exists between the release cylinder and the guide cylinder. The ratchet tooth sleeve is fitted on the release cylinder and is slidably connected to the release cylinder. The spring is fitted on the guide cylinder and is located between the spring seat and the ratchet tooth sleeve. The end of the ratchet tooth sleeve abuts against the end of the ball seat structure, and the end of the ball seat structure is fitted on the guide cylinder. The ratchet sleeve is provided with multiple second opening slots in the circumferential direction, and a fourth one-way tooth is provided on the outer wall of the ratchet sleeve. The third one-way tooth can be locked and connected with the fourth one-way tooth. The guide cylinder has multiple third flow holes on its side wall; The ball seat structure has a first channel and a second channel, the inner diameter of the second channel being larger than the inner diameter of the first channel.

[0018] Optionally, the recovery tool includes a third central tube, a sheath, a locking tooth sleeve, a locking tooth pusher, a recovery sleeve, a fixing sleeve, and a guide sleeve. The locking tooth pusher is sleeved on the upper region of the third central tube, the locking tooth sleeve is sleeved on the outer wall of the locking tooth pusher, and the sheath is sleeved on the end of the locking tooth pusher. The sheath and the locking tooth pusher press against the end of the locking tooth sleeve. The guide sleeve is fitted onto the lower end of the third central tube, and the fixed sleeve and the recovery sleeve are both fitted onto the lower end region of the third central tube, and both the fixed sleeve and the recovery sleeve can slide along the axial direction of the third central tube. Two limiting protrusions are provided on the circumferential outer wall of the lower end region of the third central tube, and the free ends of the fixed sleeve and the recovery sleeve can be respectively limited and connected to the two limiting protrusions. The docking end of the fixed sleeve is configured as a tapered portion, and the docking end of the retractable sleeve is configured as a tapered opening, wherein the tapered portion can be connected to the tapered opening; The outer circumferential wall of the docking end of the recovery sleeve is provided with a stepped structure, which can abut against the unsealing ring gasket; The docking end of the recycling sleeve is provided with multiple third opening grooves along the circumferential direction; The locking toothed sleeve is provided with multiple fourth opening slots along the circumferential direction, and a fifth one-way tooth is provided on the outer wall of the locking toothed sleeve. The third one-way tooth can be locked and connected with the fifth one-way tooth.

[0019] This invention provides an integrally bidirectional anchored releaseable packer and its delivery and setting tool, which employs a two-stage pressure control system. A lower first preset pressure is used for setting, and a higher second preset pressure is used for release. The pressure levels are clear and highly controllable, overcoming the shortcomings of traditional single-pressure or purely mechanical control methods that suffer from poor precision. This effectively avoids faults such as incomplete setting, accidental release, and release jamming, significantly improving the stability and reliability of setting and release operations. Simultaneously, the anchoring mechanism and composite sealing mechanism are integrated and assembled on the outer wall of the central tube assembly, and an integrated locking limit is achieved through a one-way locking mechanism, changing the traditional structural mode where the anchoring and sealing mechanisms operate independently. When the setting tool applies force, it can simultaneously complete the coordinated action of the anchoring mechanism opening and anchoring and the composite sealing mechanism radial expansion and sealing, realizing the synchronous formation of anchoring support and annular seal, and the structural linkage is stronger; in addition, a special recovery tool is provided, which can be precisely docked and adapted with the packer after setting. By unlocking the one-way locking mechanism through the recovery tool, the sleeve anchoring state of the anchoring mechanism and the annular seal state of the composite sealing mechanism can be released simultaneously, realizing the integrated synchronous reset and unlocking of the anchoring and sealing structures. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the overall bidirectional anchored desealable packer and the packer fed into and set the sealing tool provided in the embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the overall bidirectional anchored desealable packer provided in the embodiment of the present invention, and the packer into which the first connecting sleeve, the second connecting sleeve and the third connecting sleeve are removed. Figure 3 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the upper connector of the feeding and setting tool connected to the composite sealing mechanism provided in the embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the anchoring mechanism for the insertion and setting tool provided in the embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the barrel-shaped slip for feeding and setting the sealing tool provided in the embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the upper cone of the feeding and setting tool provided in the embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the lower cone of the feeding and setting tool provided in the embodiment of the present invention; Figure 8 This is a cross-sectional view of the overall bidirectional anchored resealable packer and the packer fed into and set the sealing tool provided in the embodiments of the present invention; Figure 9 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the setting tool for feeding and setting, provided in an embodiment of the present invention. Figure 10 This is a schematic diagram of the overall bidirectional anchored resealable packer and the setting tool for the setting tool, with the ball seat structure removed, provided in an embodiment of the present invention. Figure 11 This is a partial structural diagram of the overall bidirectional anchored resealable packer and the release structure for the feeding and setting tool provided in an embodiment of the present invention. Figure 12 This is a cross-sectional view of the overall bidirectional anchored resealable packer and the setting tool fed into the setting tool provided in the embodiment of the present invention; Figure 13 This is a cross-sectional view of the overall bidirectional anchored resealable packer and the packer and setting tool connected to the setting tool provided in the embodiment of the present invention; Figure 14 yes Figure 13 A partial view of A in the middle; Figure 15This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the packer and setting tool connected to the setting tool provided in the embodiment of the present invention; Figure 16 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the recovery tool for feeding and setting the packer provided in the embodiments of the present invention; Figure 17 This is a cross-sectional view of the overall bidirectional anchored resealable packer and the recovery tool for feeding and setting the packer provided in the embodiments of the present invention; Figure 18 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the recovery sleeve for feeding and setting tools provided in the embodiments of the present invention; Figure 19 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the fixed sleeve for feeding and setting tools provided in the embodiments of the present invention; Figure 20 This is a schematic diagram of the structure of the overall bidirectional anchored resealable packer and the retrieval tool and packer connected to the setting tool provided in the embodiment of the present invention; Figure 21 This is a cross-sectional view of the overall bidirectional anchored resealable packer and the retrieval tool and packer connected to the setting tool provided in the embodiment of the present invention; Figure 22 yes Figure 21 A partial view of B in the middle; Figure 23 yes Figure 21 A partial view of C.

[0022] In the figure: 1. Packer; 11. Central tube assembly; 111. Upper cap; 112. First central tube; 1121. First opening slot; 113. Upper connector; 1131. Third one-way tooth; 114. First connecting sleeve; 115. Second connecting sleeve; 116. Third connecting sleeve; 117. Unsealing ring gasket; 12. Anchoring mechanism; 121. Upper cone; 1211. Annular protrusion; 12111. First wedge-shaped inclined surface; 12112. First snap-fit ​​inclined surface; 1212. Opening inclined surface; 122. Lower cone; 23. Barrel-shaped locking slip; 1231. Strip-shaped tile; 12311. First one-way tooth; 12312. Second one-way tooth; 12313. Central groove; 12314. Snap-fit ​​groove; 123141. Second wedge-shaped inclined surface; 123142. Second snap-fit ​​inclined surface; 1232. Spacing groove; 13. Composite sealing mechanism; 131. Upper connecting cylinder; 132. Lower connecting cylinder; 133. Rubber sleeve connecting sleeve; 14. First one-way locking structure; 15. Second one-way locking structure; 16. Third one-way locking structure; 2. Sealing tool; 21. Connector sleeve; 22. Three-piston structure; 221. Second central tube; 2211. First flow hole; 2212. Second flow hole; 222. First-stage piston barrel; 223. First-stage piston pusher; 224. Second-stage piston barrel; 225. Second-stage piston pusher; 226. Third-stage piston barrel; 227. Third-stage piston pusher; 228. Support sleeve; 229. Movable pusher; 23. Release mechanism; 231. Guide sleeve; 2311. Third flow hole; 232. Spring seat; 233. Spring; 234. Unsealing sleeve; 235. Ratchet tooth sleeve; 2351. Second opening groove; 2352. Fourth one-way tooth; 24. Ball seat structure; 241. First channel; 242. Second channel; 3. Recycling tool; 31. Third central tube; 311. Limiting protrusion ring; 32. Sheath; 33. Locking tooth sleeve; 331. Fourth opening groove; 332. Fifth one-way tooth; 34. Locking tooth pusher; 35. Recycling sleeve; 351. Conical opening; 352. Stepped structure; 353. Third opening groove; 36. Fixing sleeve; 361. Conical part; 37. Guide sleeve. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The present invention provides an integrally bidirectional anchored releaseable packer and a delivery and setting tool, including a packer 1, a setting tool 2 and a retrieval tool 3, wherein the setting tool 2 uses a first preset pressure to set the packer 1 in the sleeve and uses a second preset pressure to release the packer 1, and the first preset pressure is less than the second preset pressure. The recovery tool 3 is used to extend into the casing and dock with the set packer 1 to recover the packer 1; The packer 1 includes a central tube assembly 11, an anchoring mechanism 12, a composite sealing mechanism 13, and a one-way locking mechanism. The anchoring mechanism 12 and the composite sealing mechanism 13 are both sleeved on the outer wall of the central tube assembly 11, and the anchoring mechanism 12 and the composite sealing mechanism 13 are both locked to the central tube assembly 11 by the one-way locking mechanism. The force of the setting tool 2 can push the anchoring mechanism 12 to open and anchor on the inner wall of the casing, while compressing the composite sealing mechanism 13 to expand radially and fit against the inner wall of the casing to form an annular seal. The recovery tool 3 can be linked to unlock the one-way locking mechanism, simultaneously releasing the anchoring state of the anchoring mechanism 12 and the sealing state of the composite sealing mechanism 13. The present invention provides an overall bidirectional anchored releaseable packer and a feeding and setting tool, which adopts a two-stage pressure graded control. It uses a lower first preset pressure to complete the setting and a higher second preset pressure to achieve release. The pressure levels are clear and highly controllable, overcoming the defects of poor precision of traditional single pressure or pure mechanical control. It effectively avoids faults such as incomplete setting, accidental release, and release jamming, and significantly improves the stability and reliability of setting and release operations. At the same time, the anchoring mechanism 12 and the composite sealing mechanism 13 are integrated and assembled on the outer wall of the central tube assembly 11, and integrated locking and limiting are achieved through the one-way locking mechanism, which changes the traditional structural mode in which the anchoring and sealing mechanisms work independently. When the setting tool 2 applies force, it can simultaneously complete the coordinated action of the anchoring mechanism 12 opening and anchoring and the composite sealing mechanism 13 radially expanding and sealing, so as to realize the synchronous formation of anchoring support and annular seal, and the structure linkage is stronger. In addition, the dedicated recovery tool 3 can be precisely docked and adapted with the packer 1 after setting. By unlocking the one-way locking mechanism through the recovery tool 3, the sleeve anchoring state of the anchoring mechanism 12 and the annular seal state of the composite sealing mechanism can be released simultaneously, so as to realize the integrated synchronous reset and unlocking of the anchoring and sealing structures.

[0027] As an optional implementation, the anchoring mechanism 12 includes an upper cone 121, a lower cone 122 and a barrel-shaped clip 123. The upper cone 121 and the lower cone 122 are both sleeved on the outer wall of the central tube assembly 11, and the barrel-shaped clip 123 is sleeved on the respective snap-fit ​​sections of the upper cone 121 and the lower cone 122. The one-way locking mechanism includes a first one-way locking structure 14, through which the inner wall of the upper cone 121 and the outer wall of the central tube assembly 11 are locked together. The first one-way locking structure 14 includes a first one-way outer ring tooth, a first one-way inner ring tooth, and a first fixing ring. The first one-way outer ring tooth is fixedly disposed on the circumferential outer wall of the first central tube 112. The inner ring of the first fixing ring is provided with a first one-way inner ring tooth. The first fixing ring is located in the inner ring of the free end of the upper cone 121. The first one-way outer ring tooth and the first one-way inner ring tooth cooperate to allow the first fixing ring to move in the direction close to the barrel-shaped slip 123, but not in the direction away from the barrel-shaped slip 123. It is restricted by the cooperation of the first one-way outer ring tooth and the first one-way inner ring tooth, thereby causing the upper cone 121 to press the upper end area of ​​the barrel-shaped slip 123, thereby causing the upper end area of ​​the barrel-shaped slip 123 to open radially.

[0028] As an optional implementation, at least one annular protrusion 1211 is provided on the circumferential outer wall of the snap-fit ​​section of each of the upper cone 121 and the lower cone 122. The side of the annular protrusion 1211 facing the center of the barrel-shaped latch 123 is set as a first wedge-shaped inclined surface 12111, and the side of the annular protrusion 12111 opposite to the first wedge-shaped inclined surface 12111 is set as a first snap-fit ​​inclined surface 12112. The inclination angle of the first wedge-shaped inclined surface 12111 is smaller than the inclination angle of the first snap-fit ​​inclined surface 12112. The circumferential outer wall of the middle region of the upper cone 121 and the lower cone 122 is provided with an opening slope 1212. During the opening process, the end of the barrel-shaped slip 123 will move along the inclined direction of the opening slope 1212, so that the end of the barrel-shaped slip 123 opens in the radial direction and moves in the axial direction.

[0029] As an optional implementation, the barrel-shaped tile 123 includes a plurality of strip tiles 1231, all of which are connected end to end in sequence and evenly distributed in the circumferential direction to form a barrel-shaped structure; There is a gap 1232 between two adjacent strip tiles 1231. The outer wall of the strip tile 1231 is provided with a first one-way tooth 12311, a second one-way tooth 12312 and a central groove 12313. The central groove 12313 is located between the first one-way tooth 12311 and the second one-way tooth 12312. The inner wall of the strip tile 1231 is provided with at least two locking grooves 12314, and the annular protrusion 1211 can be locked with the locking grooves 12314. When the barrel-shaped tile 123 is in the closed state, the locking grooves 12314 cooperate with the corresponding annular protrusions 1211. The side of the locking groove 12314 facing the center of the strip tile 1231 is configured as a second wedge-shaped inclined surface 123141, which fits against the corresponding first wedge-shaped inclined surface 12111 while ensuring the contact area between the two. The side of the locking groove 12314 facing the end of the strip tile 1231 is configured as a second locking inclined surface 123142, which fits against the corresponding first locking inclined surface 12112. When both the upper cone 121 and the lower cone 122 press against the barrel-shaped clamp 123, the second wedge-shaped inclined surface 123141 and the corresponding first wedge-shaped inclined surface 12111 will move relative to each other, thereby allowing the end of the barrel-shaped clamp 123 to open.

[0030] As an optional implementation, the composite sealing mechanism 13 includes an upper connecting cylinder 131, a lower connecting cylinder 132 and a plurality of rubber tube connecting sleeves 133. The upper connecting cylinder 131, all the rubber tube connecting sleeves 133 and the lower connecting cylinder 132 are stacked in sequence along the axial direction, and the other end of the lower connecting cylinder 132 abuts against the end of the upper cone 121. The one-way locking mechanism includes a second one-way locking structure 15, through which the inner wall of the upper connecting cylinder 131 and the outer wall of the central tube assembly 11 are locked together. The second one-way locking structure 15 includes a second one-way outer ring tooth, a second one-way inner ring tooth, and a second fixing ring. The second one-way outer ring tooth is fixedly disposed on the circumferential outer wall of the first central tube 112. The inner ring of the second fixing ring is provided with a second one-way inner ring tooth. The second fixing ring is located in the inner ring of the upper connecting cylinder 131. The two one-way outer ring teeth and the two one-way inner ring teeth cooperate to allow the second fixing ring to move in the direction close to the rubber tube connecting sleeve 133, but not in the direction away from the rubber tube connecting sleeve 133. It is restricted by the cooperation of the two one-way outer ring teeth and the two one-way inner ring teeth. This causes the upper connecting cylinder 131 to press the end of the rubber tube connecting sleeve 133, while the lower connecting cylinder 132 is abutted by the limiting mechanism 12, thereby compressing the rubber tube connecting sleeve 133 and causing it to expand radially.

[0031] As an optional implementation, the central tube assembly 11 includes an upper cap 111, a first central tube 112, an upper connector 113, a first connecting sleeve 114, a second connecting sleeve 115, a third connecting sleeve 116, and a release ring gasket 117. The upper cap 111 is sleeved on the upper connector 113 and the end of the upper cap 111 abuts against the composite sealing mechanism 13. The end of the upper cap 111 abuts against the free end of the upper connecting cylinder 131. The upper connector 113, the first central tube 112, the first connecting sleeve 114, the second connecting sleeve 115, and the third connecting sleeve 116 are connected in sequence. The first connecting sleeve 114 abuts against the lower cone 122. The release ring gasket 117 is slidably connected to the inner wall of the lower end of the central tube assembly 11. The one-way locking mechanism includes a third one-way locking structure 16, in which the inner wall of the first connecting sleeve 114 is locked to the outer wall of the lower end of the central tube assembly 11 through the third one-way locking structure 16; the third one-way locking structure 16 includes a third one-way outer ring tooth and a third one-way inner ring tooth, the third one-way outer ring tooth is fixedly disposed on the circumferential outer wall of the first central tube 112, and the third one-way inner ring tooth is disposed on the inner wall of the first connecting sleeve 114. When the unsealing ring 117 is at the opening at the lower end of the first central tube 112, the third one-way outer ring tooth and the third one-way inner ring tooth cooperate to restrict the first connecting sleeve 114 from moving towards the barrel-shaped slip 123, providing axial static support for the lower cone 122. When the unsealing ring 117 is pulled back by the recovery tool 3, the unsealing ring 117 will move towards the barrel-shaped slip 123, so that the lower end of the first central tube 112 can retract, causing the third one-way outer ring tooth and the third one-way inner ring tooth to separate. Then the first connecting sleeve 114 will move relative to the first central tube 112. The anchoring mechanism 12 and the composite sealing mechanism 13 will return to their original state due to their own restoring elasticity. After that, the packer 1 can be removed from the sleeve.

[0032] The lower end of the first central tube 112 is provided with multiple first opening grooves 1121 along the circumferential direction, so that the lower end of the first central tube 112 forms multiple plate-like structures. At the same time, the cylinder formed by the plate-like structures needs to be supported by the unsealing ring pad 117 to maintain the cooperation of the third unidirectional outer ring tooth and the third unidirectional inner ring tooth. A third one-way tooth 1131 is provided on the inner wall of the upper connector 113.

[0033] As an optional implementation, the setting tool 2 includes a connector cylinder 21, a three-piston structure 22, a release structure 23, and a ball seat structure 24. The connector cylinder 21, the three-piston structure 22, the release structure 23, and the ball seat structure 24 are connected in sequence. The three-piston structure 22 can engage with the upper cap 111, and the release structure 23 can extend into the upper connector 113 and be locked to the upper connector 113. By placing a steel ball in the ball seat structure 24, a pressure is created within the setting tool 2. When the pressure reaches a first preset pressure, it pushes the three-piston structure 22 to move, causing it to push the upper cap 111 to move, thereby transmitting the pushing force sequentially downwards, causing the anchoring mechanism 12 to open and the composite sealing mechanism 13 to expand radially. When the pressure reaches a second preset pressure, the release structure 23 moves, allowing the third one-way tooth 1131 and the fourth one-way tooth 2352 to separate, thus allowing the setting tool 2 to be removed from the packer 1.

[0034] As an optional implementation, the three-piston structure 22 includes a second central tube 221, a first-stage piston barrel 222, a first-stage piston pusher 223, a second-stage piston barrel 224, a second-stage piston pusher 225, a third-stage piston barrel 226, a third-stage piston pusher 227, a support cylinder 228, and a movable pusher 229. The connector cylinder 21, the first-stage piston barrel 222, the second-stage piston barrel 224, the third-stage piston barrel 226, and the support cylinder 228 are sequentially connected and form a piston ring cavity with the second central tube 221. The first-stage piston pusher 226... 23. The second-stage piston pusher 225, the third-stage piston pusher 227 and the movable pusher 229 are sequentially fitted on the second central tube 221 and can slide along the axial direction of the second central tube 221. The first-stage piston pusher 223, the second-stage piston pusher 225 and the third-stage piston pusher 227 are all located in the piston ring cavity. The outer wall of the movable pusher 229 is slidably connected to the inner wall of the support cylinder 228. The end of the movable pusher 229 can be connected to the upper cap 111. The inner wall of the movable pusher 229 is slidably connected to the release structure 23. The second central tube 221 has multiple first flow holes 2211 and multiple second flow holes 2212 on its side wall. Liquid in the second central tube 221 can flow into the piston space where the first-stage piston pusher 223 and the second-stage piston pusher 225 are located through the first flow holes 2211, which will create pressure to push the first-stage piston pusher 223 and the second-stage piston pusher 225. Liquid in the second central tube 221 can flow into the piston space where the third-stage piston pusher 227 is located through the second flow holes 2212, which will create pressure to push the third-stage piston pusher 227. When the pressure reaches the first preset pressure, the first-stage piston pusher 223 will push the second-stage piston pusher 225, the second-stage piston pusher 225 will push the third-stage piston pusher 227, and the third-stage piston pusher 227 will push the movable pusher 229, so that the pushing force acts on the upper cap 111.

[0035] As an optional implementation, the release structure 23 includes a guide cylinder 231, a spring seat 232, a spring 233, a release cylinder 234, and a ratchet tooth sleeve 235. The guide cylinder 231 is connected to the second central tube 221 through the spring seat 232. The outer wall of the spring seat 232 is slidably connected to the inner wall of the movable push cylinder 229. The release cylinder 234 is slidably connected to the guide cylinder 231, and there is a hydraulic annular cavity between the release cylinder 234 and the guide cylinder 231. The ratchet tooth sleeve 235 is sleeved on the release cylinder 234, and the ratchet tooth sleeve 235 is slidably connected to the release cylinder 234. The spring 233 is sleeved on the guide cylinder 231, and the spring 233 is located between the spring seat 232 and the ratchet tooth sleeve 235. The end of the ratchet tooth sleeve 235 abuts against the end of the ball seat structure 24, and the end of the ball seat structure 24 is sleeved on the guide cylinder 231. The ratchet sleeve 235 has multiple second opening slots 2351 along the circumferential direction, which makes the end of the ratchet sleeve 235 form multiple plate-like structures. At the same time, the cylinder formed by the plate-like structures needs to be supported by the end of the unsealing cylinder 234 to keep the third one-way tooth 1131 and the fourth one-way tooth 2352 engaged. The outer wall of the ratchet sleeve 235 is provided with the fourth one-way tooth 2352, and the third one-way tooth 1131 can be locked and connected with the fourth one-way tooth 2352. Multiple third flow holes 2311 are provided on the side wall of the guide cylinder 231. The liquid in the second central tube 221 can flow into the piston space where the unsealing cylinder 234 is located through the third flow holes 2311. When its pressure reaches the second preset pressure, the unsealing cylinder 234 will slide relative to the ratchet tooth sleeve 235 and slide towards the spring seat 232 until the end of the unsealing cylinder 234 is separated from the plate structure area of ​​the ratchet tooth sleeve 235. As a result, the third one-way tooth 1131 and the fourth one-way tooth 2352 will separate, and the setting tool 2 can be removed from the packer 1. The ball seat structure 24 has a first channel 241 and a second channel 242, the inner diameter of the second channel 242 being larger than the inner diameter of the first channel 241. The main steel ball can be placed in the first channel 241, and the spare steel ball can be placed in the second channel 242. The diameter of the main steel ball is smaller than the diameter of the spare steel ball, meaning that if the pressure formed by the main steel ball becomes abnormal, the spare steel ball can be deployed.

[0036] As an optional implementation, the recovery tool 3 includes a third central tube 31, a sheath 32, a locking toothed sleeve 33, a locking toothed pusher 34, a recovery sleeve 35, a fixing sleeve 36, and a guide sleeve 37. The locking toothed pusher 34 is sleeved on the upper end region of the third central tube 31, the locking toothed sleeve 33 is sleeved on the outer wall of the locking toothed pusher 34, and the sheath 32 is sleeved on the end of the locking toothed pusher 34, and the sheath 32 and the locking toothed pusher 34 press against the end of the locking toothed sleeve 33. The guide sleeve 37 is sleeved on the lower end of the third central tube 31, and the fixed sleeve 36 and the retraction sleeve 35 are both sleeved on the lower end area of ​​the third central tube 31, and both the fixed sleeve 36 and the retraction sleeve 35 can slide along the axial direction of the third central tube 31. Two limiting protrusions 311 are provided on the circumferential outer wall of the lower end region of the third central tube 31. The free ends of the fixed sleeve 36 and the recycle sleeve 35 can be respectively limited and connected to the two limiting protrusions 311 to limit the degree of connection between the docking ends of the fixed sleeve 36 and the recycle sleeve 35. The docking end of the fixed sleeve 36 is configured as a tapered portion 361, and the docking end of the recovery sleeve 35 is configured as a tapered opening 351. The tapered portion 361 can be connected to the tapered opening 351. The docking end of the recovery sleeve 35 is provided with multiple third opening grooves 353 along the circumferential direction, so that the end of the recovery sleeve 35 forms multiple plate-like structures, which can make the tapered portion 361 and the tapered opening 351 tightly connected.

[0037] The outer circumferential wall of the docking end of the recovery sleeve 35 is provided with a stepped structure 352, which can abut against the unsealing ring gasket 117. The locking toothed sleeve 33 is provided with multiple fourth opening grooves 331 along the circumferential direction, so that the end of the locking toothed sleeve 33 forms multiple plate-like structures. The outer wall of the locking toothed sleeve 33 is provided with a fifth one-way tooth 332, and the third one-way tooth 1131 can be locked and connected with the fifth one-way tooth 332. The end of the locking tooth sleeve 33 is provided with an inclined bevel, and the circumferential side wall of the locking tooth pusher 34 is provided with a stepped inclined surface. When the inclined bevel and the stepped inclined surface are in contact, the end of the locking tooth sleeve 33 will be supported. After the retrieval tool 3 is inserted into the packer 1, the third one-way tooth 1131 will cooperate with the fifth one-way tooth 332. At the same time, the stepped structure 352 of the retrieval sleeve 35, the fixed sleeve 36 and the guide sleeve 37 will pass through the release ring pad 117. Then the third central tube 31 is pulled back, and the fixed sleeve 36 will move towards the retrieval sleeve 35, so that the conical part 361 and the conical opening 351 are tightly connected, thereby supporting the end of the retrieval sleeve 35, so that its stepped structure 352 abuts against the release ring pad 117. Then the retrieval sleeve 35 will drive the release ring pad 117 to move, and the release ring pad 117 will move towards the barrel-shaped slip 123. After that, the retrieval of the packer 1 can be completed.

[0038] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A resealable packer with integral bidirectional anchoring and a feeding and setting tool, characterized in that, It includes a packer (1), a setting tool (2), and a recovery tool (3), wherein, The setting tool (2) uses a first preset pressure to set the packer (1) inside the sleeve and uses a second preset pressure to release it from the packer (1), and the first preset pressure is less than the second preset pressure; The recovery tool (3) is used to extend into the sleeve and dock with the set packer (1) to recover the packer (1); The packer (1) includes a central tube assembly (11), an anchoring mechanism (12), a composite sealing mechanism (13), and a one-way locking mechanism. The anchoring mechanism (12) and the composite sealing mechanism (13) are both sleeved on the outer wall of the central tube assembly (11), and the anchoring mechanism (12) and the composite sealing mechanism (13) are both locked to the central tube assembly (11) by the one-way locking mechanism. The force of the setting tool (2) can push the anchoring mechanism (12) to open and anchor to the inner wall of the sleeve, while compressing the composite sealing mechanism (13) to make it expand radially and fit against the inner wall of the sleeve to form an annular seal; The recycling tool (3) can unlock the one-way locking mechanism in conjunction with the release of the anchoring mechanism (12) and the sealing state of the composite sealing mechanism (13).

2. The integrally bidirectionally anchored resealable packer and its feeding and setting tool according to claim 1, characterized in that, The anchoring mechanism (12) includes an upper cone (121), a lower cone (122), and a barrel-shaped slip (123). The upper cone (121) and the lower cone (122) are both fitted onto the outer wall of the central tube assembly (11), and the barrel-shaped slip (123) is fitted onto the respective snap-fit ​​sections of the upper cone (121) and the lower cone (122). The one-way locking mechanism includes a first one-way locking structure (14), and the inner wall of the upper cone (121) and the outer wall of the central tube assembly (11) are locked together by the first one-way locking structure (14).

3. The integrally bidirectionally anchored resealable packer and its feeding and setting tool according to claim 2, characterized in that, At least one annular protrusion (1211) is provided on the circumferential outer wall of the snap-fit ​​section of each of the upper cone (121) and the lower cone (122). The side of the annular protrusion (1211) facing the center of the barrel-shaped latch (123) is set as a first wedge-shaped inclined surface (12111), and the side of the annular protrusion (12111) opposite to the first wedge-shaped inclined surface (12111) is set as a first snap-fit ​​inclined surface (12112). The inclination angle of the first wedge-shaped inclined surface (12111) is smaller than the inclination angle of the first snap-fit ​​inclined surface (12112). The circumferential outer wall of the middle region of both the upper cone (121) and the lower cone (122) is provided with an opening inclined surface (1212).

4. The integrally bidirectionally anchored resealable packer and its feeding and setting tool according to claim 3, characterized in that, The barrel-shaped tile (123) includes multiple strip tiles (1231), all of which are connected end to end and evenly distributed along the circumferential direction to form a barrel-shaped structure; There is a gap (1232) between two adjacent strip tiles (1231). The outer wall of the strip tile (1231) is provided with a first one-way tooth (12311), a second one-way tooth (12312) and a central groove (12313). The central groove (12313) is located between the first one-way tooth (12311) and the second one-way tooth (12312). The inner wall of the strip-shaped tile (1231) is provided with at least two locking grooves (12314), and the annular protrusion (1211) can be locked with the locking grooves (12314); The side of the snap-fit ​​groove (12314) facing the center of the strip tile (1231) is configured as a second wedge-shaped inclined surface (123141), and the side of the snap-fit ​​groove (12314) facing the end of the strip tile (1231) is configured as a second snap-fit ​​inclined surface (123142).

5. The integrally bidirectionally anchored resealable packer and its feeding and setting tool according to claim 2, characterized in that, The composite sealing mechanism (13) includes an upper connecting cylinder (131), a lower connecting cylinder (132), and multiple rubber sleeve connecting sleeves (133). The upper connecting cylinder (131), all the rubber sleeve connecting sleeves (133), and the lower connecting cylinder (132) are stacked sequentially along the axial direction. The other end of the lower connecting cylinder (132) abuts against the end of the upper cone (121). The one-way locking mechanism includes a second one-way locking structure (15), and the inner wall of the upper connecting cylinder (131) and the outer wall of the central tube assembly (11) are locked together by the second one-way locking structure (15).

6. The integrally bidirectionally anchored resealable packer and its feeding and setting tool according to claim 2, characterized in that, The central tube assembly (11) includes an upper cap (111), a first central tube (112), an upper connector (113), a first connecting sleeve (114), a second connecting sleeve (115), a third connecting sleeve (116), and a release ring gasket (117). The upper cap (111) is sleeved on the upper connector (113), and the end of the upper cap (111) abuts against the composite sealing mechanism (13). The upper connector (113), the first central tube (112), the first connecting sleeve (114), the second connecting sleeve (115), and the third connecting sleeve (116) are connected in sequence. The first connecting sleeve (114) abuts against the lower cone (122), and the release ring gasket (117) is slidably connected to the inner wall of the lower end of the central tube assembly (11). The one-way locking mechanism includes a third one-way locking structure (16), and the inner wall of the first connecting sleeve (114) and the outer wall of the lower end of the central tube assembly (11) are locked together by the third one-way locking structure (16). The lower end of the first central tube (112) is provided with multiple first opening grooves (1121) along the circumferential direction. The inner wall of the upper connector (113) is provided with a third one-way tooth (1131).

7. The integrally bidirectionally anchored resealable packer and its feeding and setting tool according to claim 6, characterized in that, The setting tool (2) includes a connector cylinder (21), a three-piston structure (22), a release structure (23), and a ball seat structure (24). The connector cylinder (21), the three-piston structure (22), the release structure (23), and the ball seat structure (24) are connected in sequence. The three-piston structure (22) can be connected to the upper cap (111). The release structure (23) can be inserted into the upper connector (113) and can be locked to the upper connector (113).

8. The integrally bidirectionally anchored resealable packer and feeding and setting tool according to claim 7, characterized in that, The three-piston structure (22) includes a second central tube (221), a first-stage piston barrel (222), a first-stage piston pusher (223), a second-stage piston barrel (224), a second-stage piston pusher (225), a third-stage piston barrel (226), a third-stage piston pusher (227), a support tube (228), and a movable pusher (229). The connector tube (21), the first-stage piston barrel (222), the second-stage piston barrel (224), the third-stage piston barrel (226), and the support tube (228) are connected in sequence and form a piston ring cavity with the second central tube (221). The first-stage piston pusher (223) and the second-stage piston... The push cylinder (225), the third-stage piston push cylinder (227), and the movable push cylinder (229) are sequentially sleeved on the second central tube (221) and can slide along the axial direction of the second central tube (221). The first-stage piston push cylinder (223), the second-stage piston push cylinder (225), and the third-stage piston push cylinder (227) are all located in the piston ring cavity. The outer wall of the movable push cylinder (229) is slidably connected to the inner wall of the support cylinder (228). The end of the movable push cylinder (229) can be connected to the upper cap (111). The inner wall of the movable push cylinder (229) is slidably connected to the release structure (23). The second central tube (221) has a plurality of first flow holes (2211) and a plurality of second flow holes (2212) on its side wall.

9. The integrally bidirectionally anchored resealable packer and its feeding and setting tool according to claim 8, characterized in that, The release mechanism (23) includes a guide cylinder (231), a spring seat (232), a spring (233), a release cylinder (234), and a ratchet sleeve (235). The guide cylinder (231) is connected to the second central tube (221) through the spring seat (232). The outer wall of the spring seat (232) is slidably connected to the inner wall of the movable push cylinder (229). The release cylinder (234) is slidably connected to the guide cylinder (231), and there is a gap between the release cylinder (234) and the guide cylinder (231). The hydraulic ring cavity has a ratchet tooth sleeve (235) sleeved on the unsealing cylinder (234) and the ratchet tooth sleeve (235) slidably connected to the unsealing cylinder (234). The spring (233) is sleeved on the guide cylinder (231) and the spring (233) is located between the spring seat (232) and the ratchet tooth sleeve (235). The end of the ratchet tooth sleeve (235) abuts against the end of the ball seat structure (24), and the end of the ball seat structure (24) is sleeved on the guide cylinder (231). The ratchet sleeve (235) is provided with multiple second opening slots (2351) in the circumferential direction, and a fourth one-way tooth (2352) is provided on the outer wall of the ratchet sleeve (235). The third one-way tooth (1131) can be locked and connected with the fourth one-way tooth (2352). The guide cylinder (231) has a plurality of third flow holes (2311) on its side wall. The ball seat structure (24) is provided with a first channel (241) and a second channel (242), and the inner diameter of the second channel (242) is larger than the inner diameter of the first channel (241).

10. The integrally bidirectionally anchored resealable packer and its feeding and setting tool according to claim 6, characterized in that, The recycling tool (3) includes a third central tube (31), a sheath (32), a locking tooth sleeve (33), a locking tooth pusher (34), a recycling sleeve (35), a fixing sleeve (36), and a guide sleeve (37). The locking tooth pusher (34) is sleeved on the upper region of the third central tube (31), the locking tooth sleeve (33) is sleeved on the outer wall of the locking tooth pusher (34), the sheath (32) is sleeved on the end of the locking tooth pusher (34), and the sheath (32) and the locking tooth pusher (34) press against the end of the locking tooth sleeve (33). The guide sleeve (37) is sleeved on the lower end of the third central tube (31), the fixed sleeve (36) and the recovery sleeve (35) are both sleeved on the lower end region of the third central tube (31), and the fixed sleeve (36) and the recovery sleeve (35) can slide along the axial direction of the third central tube (31). Two limiting protrusions (311) are provided on the circumferential outer wall of the lower end region of the third central tube (31), and the free ends of the fixed sleeve (36) and the recyclable sleeve (35) can be respectively limited and connected to the two limiting protrusions (311). The docking end of the fixed sleeve (36) is configured as a tapered part (361), and the docking end of the recyclable sleeve (35) is configured as a tapered opening (351). The tapered part (361) can be connected to the tapered opening (351). The outer circumferential wall of the docking end of the recovery sleeve (35) is provided with a stepped structure (352), which can abut against the unsealing ring gasket (117). The docking end of the recovery sleeve (35) is provided with multiple third opening grooves (353) along the circumferential direction; The locking toothed sleeve (33) is provided with multiple fourth opening grooves (331) along the circumferential direction, and a fifth one-way tooth (332) is provided on the outer wall of the locking toothed sleeve (33). The third one-way tooth (1131) can be locked and connected with the fifth one-way tooth (332).

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