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CN-116411852-B - Restoration device and restoration method for shrinkage of expansion sleeve

CN116411852BCN 116411852 BCN116411852 BCN 116411852BCN-116411852-B

Abstract

The invention belongs to the technical field of well completion and well repair of oil and gas field well drilling, and discloses a repairing device and a repairing method for reducing an expansion sleeve. The guide shoe is used for suppressing pressure to generate liquid pressure, the pipe column anchoring assembly integrally anchors the repairing device on the inner wall of the expansion sleeve, the pressure relief valve assembly can send a liquid pressure reduction signal to the ground to display that repairing operation is completed, the expansion cone assembly radially extrudes the diameter reduction position to expand and repair, and the thrust hydraulic cylinder assembly provides repairing hydraulic power. The invention can avoid excessive repair of the expansion sleeve, the fluke can reset automatically after the diameter reduction repair, and the repair device is unlocked, thus realizing the in-situ diameter reduction repair without milling, having high success rate of one-time repair, forming a horn mouth at the end of the expansion sleeve after the diameter reduction repair, and facilitating the guiding and entering of subsequent tools.

Inventors

  • WANG LEI
  • WANG YUAN
  • WANG JUNYING
  • WANG FEI
  • CHEN FUJUN
  • LUO HUAN
  • XUE ZHIYONG
  • ZHONG YONG
  • SHANG XIANFEI
  • YANG XING
  • LI HU
  • ZHU HAILONG
  • HUO AILI
  • GONG YONGFENG
  • YANG JIE

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团长城钻探工程有限公司

Dates

Publication Date
20260505
Application Date
20211231

Claims (10)

  1. 1. The utility model provides a prosthetic devices of expansion sleeve pipe throat which characterized in that includes from bottom to top sets gradually: The shoe comprises a guide shoe (1), wherein a conical ball seat (11) is arranged in the center of the guide shoe (1) to receive a sealing ball (300); the tubular column anchoring assembly (2) is connected with the guide shoe (1) at the bottom end of the tubular column anchoring assembly (2), and the tubular column anchoring assembly (2) comprises flukes (21), wherein the flukes (21) can radially extend out to be anchored on the inner wall of the expansion sleeve (100); The pressure release valve assembly (3) comprises a pressure release valve central tube (31), a pressure release sliding sleeve (32) and a first reset spring (33), wherein the bottom end of the pressure release valve central tube (31) is connected with the tubular column anchoring assembly (2), a pressure release hole (311) is formed in the tube wall of the pressure release valve central tube (31), the pressure release valve central tube (31) is sleeved with the first reset spring (33) and the pressure release sliding sleeve (32), two ends of the first reset spring (33) are respectively abutted to the top end of the tubular column anchoring assembly (2) and the bottom end of the pressure release sliding sleeve (32), the top end of the pressure release sliding sleeve (32) is abutted to the step surface of the outer side wall of the pressure release valve central tube (31), and the pressure release sliding sleeve (32) can slide along the axial direction of the pressure release valve central tube (31) so as to seal or open the pressure release hole (311); The expansion cone assembly (4) comprises an expansion cone (41) and a pushing sleeve (42), wherein the top end of the pushing sleeve (42) is abutted to the bottom end of the expansion cone (41), a first liquid outlet hole (421) is formed in the side wall of the pushing sleeve (42), the inner diameter of the pushing sleeve (42) is larger than the outer diameter of a pressure release valve central tube (31), the inner diameter of the pushing sleeve (42) is smaller than the outer diameter of the pressure release sliding sleeve (32), a conical surface (411) is formed in the outer side wall of the expansion cone (41), and the conical surface (411) can be abutted to the position of a reducing diameter (200) of the expansion sleeve (100); The thrust hydraulic cylinder assembly (5) comprises an upper central tube (51), a variant buckle joint (52), a lower central tube (53), a piston (54), an end cap (55) and an outer sleeve (56), wherein the upper central tube (51) and the lower central tube (53) are connected through the variant buckle joint (52), the top end of the upper central tube (51) is connected with an upper connector (6), the bottom end of the lower central tube (53) is connected with the top end of a pressure release valve central tube (31), the outer sleeve (56) is sleeved on the variant buckle joint (52), the piston (54) is sleeved on the lower central tube (53) and the bottom end of the piston (54) is penetrated with an expansion cone (41) and connected with a pushing sleeve (42), the top end of the expansion cone (41) is abutted to the step surface of the outer wall of the piston (54), the top end of the piston (54) is connected with the outer sleeve (56), a second liquid flow channel (531) is formed between the inner wall of the piston (54) and the outer wall of the lower central tube (53), a second liquid flow channel (541) is formed, a second liquid flow channel (531) is formed, a second liquid flow channel (541), the end cap (55) is connected to the top end of the outer sleeve (56) and is connected with the upper central tube (51) through a shear pin (551), a first liquid inlet hole (532) is formed in the side wall of the lower central tube (53), a cavity (533) is formed between the top end of the piston (54) and the variable buckle joint (52) and the outer sleeve (56), and the first liquid inlet hole (532) is communicated with the cavity (533).
  2. 2. The expansion sleeve diameter reduction repairing device according to claim 1, wherein an included angle between the conical surface (411) of the expansion cone (41) and the axial direction is 15 degrees, the bottom end outer diameter of the expansion cone (41) is smaller than the inner diameter of the diameter reduction (200), and the top end outer diameter of the expansion cone (41) is larger than the inner diameter of the expansion sleeve (100).
  3. 3. The expansion sleeve diameter-reducing repairing device according to claim 1, wherein the tubular column anchoring assembly (2) further comprises a tubular column body (22), a second restoring spring (23) and a cover plate (24), the bottom end of the tubular column body (22) is connected with the guide shoe (1), the top end is connected with the pressure release valve central tube (31), the tubular column body (22) is provided with a radial groove (221), the groove bottom of the radial groove (221) is provided with a second liquid inlet hole (222), the second liquid inlet hole (222) penetrates through the side wall of the tubular column body (22), the base end of the anchor claw (21) is arranged in the radial groove (221) and covers the second liquid inlet hole (222), the anchoring end of the anchor claw (21) is provided with teeth and long grooves, the long grooves are internally provided with a second restoring spring (23), the second restoring spring (23) is abutted against the cover plate (24), the two ends of the cover plate (24) are arranged in the long grooves in a penetrating manner, the tubular column body (22) is fixedly provided with second liquid inlet holes (222), the base ends of the anchor claw (21) are arranged in the radial groove (22), and the anchor claw (21) extends out of the long grooves (21) when the anchor claw (21) is extended out of the long grooves (100), and the second restoring spring (23) is distributed along the two sides of the expansion sleeve.
  4. 4. A device for repairing a shrinkage cavity of an expansion sleeve according to claim 3, wherein a spring hole is formed in the bottom of the long groove, and one end of the second return spring (23) is arranged in the spring hole to limit.
  5. 5. A casing-reducing repair device according to claim 3, wherein the flukes (21) are provided with at least three groups, the three groups of flukes (21) being spaced apart and staggered along the long axis of the tubular body (22), each group comprising at least three flukes (21), the at least three flukes (21) being spaced apart and evenly arranged along the circumference of the tubular body (22).
  6. 6. A device for repairing a shrinkage cavity of an expansion sleeve according to claim 3, wherein the outer wall of the fluke (21) is provided with a circumferential annular groove, a sealing ring (211) is arranged in the annular groove, and the sealing ring (211) is clamped between the fluke (21) and the radial groove (221).
  7. 7. The repairing device for the shrinkage of the expansion sleeve according to claim 1, wherein a plurality of sealing grooves are formed in the central tube (31) of the pressure relief valve, the sealing grooves are respectively formed in the upper end and the lower end of the pressure relief hole (311), and sealing strips (312) are vulcanized in the sealing grooves.
  8. 8. The device for repairing the shrinkage of the expansion sleeve according to claim 1, wherein a plurality of first liquid outlet holes (421) are formed, and the plurality of first liquid outlet holes (421) are arranged at intervals along the axial direction and the circumferential direction of the pushing sleeve (42).
  9. 9. A method for repairing the shrinkage diameter of an expansion sleeve, characterized in that the method for repairing the shrinkage diameter (200) of the end part of the expansion sleeve (100) by using the device for repairing the shrinkage diameter of the expansion sleeve according to any one of claims 1 to 8 comprises the following steps: s1, the repairing device with the reduced diameter of the expansion sleeve is lowered into the position of the reduced diameter (200) of the expansion sleeve (100) in a well, a guide shoe (1) enters the expansion sleeve (100) and continues to be lowered until the conical surface (411) of an expansion cone (41) abuts against the end part of the reduced diameter (200); S2, putting a sealing ball (300) into the repairing device with the contracted diameter of the expansion sleeve, wherein the sealing ball (300) falls into a ball seat (11) in the guide shoe (1) to start to hold pressure, and an anchor claw (21) of the tubular column anchoring assembly (2) radially extends out under the hydraulic action and is anchored on the inner wall of the expansion sleeve (100); S3, continuing to hold pressure, shearing pins (551) on the end caps (55) are sheared, the piston (54) pushes the expansion cone (41) downwards along the axial direction, the conical surface (411) of the expansion cone (41) radially extrudes the reducing diameter (200), and the expansion sleeve (100) forms a bell mouth (400) at the reducing diameter (200); S4, pushing the pushing sleeve (42) to move downwards when the expansion cone (41) moves downwards, pushing the pressure release sliding sleeve (32) to move downwards by the pushing sleeve (42) and compressing the first reset spring (33) until the top end of the pushing sleeve (42) is lower than the position of the pressure release hole (311), opening the pressure release hole (311), and reducing the pressure to prompt the completion of the restoration operation of the reducing (200); s5, stopping the pump and releasing pressure on the ground, resetting the pressure release sliding sleeve (32) under the action of the elastic force of the first reset spring (33), withdrawing the fluke (21), releasing anchoring, and starting the restoration device for reducing the expansion sleeve.
  10. 10. The method for repairing the reduced diameter of the expanded casing according to claim 9, further comprising the step of repeating the steps S1 to S5, and repairing the reduced diameter (200) a plurality of times.

Description

Restoration device and restoration method for shrinkage of expansion sleeve Technical Field The invention relates to the technical field of well completion and well repair of oil and gas field well drilling, in particular to a repairing device and a repairing method for an expansion sleeve shrinkage. Background The expansion casing technology is one new technology in petroleum industry, and is one technology for lowering casing to be expanded into well, driving expansion cone with mechanical or hydraulic pressure as power, expanding the inside diameter or outside diameter of the expansion casing to designed size via cold extrusion expansion process, and thus completing the engineering. The technology is mainly applied to multiple fields of casing damage well casing repair, old well sidetrack drilling tail pipe suspension, open hole well complex stratum sealing and the like. In the radial expansion process of the expansion sleeve, the expansion sleeve can curl inwards due to the action of friction viscous force, and the specific expression form is that the end part of the expansion sleeve after expansion is reduced in diameter, the diameter reduction can lead to the reduction of the inner diameter of the expansion sleeve, the outer diameter size of a subsequent tool to be put in can be influenced, a step can be formed, and the tool passing through the reduced diameter position is blocked. The conventional method for solving the problem in engineering is to put special grinding shoes into the special grinding shoes to grind away the expansion pipe of the reduced diameter part. However, the process for milling the expansion pipe has the following defects that (1) burrs exist after milling the expansion pipe at the reduced diameter section, a packer rubber barrel which is subsequently put in is easily damaged, (2) milling easily causes the expansion pipe column to move, the tightness of the expansion pipe is affected, the integrity of a shaft is damaged, and (3) milling also has the risk of damaging an upper layer of the pipe. Disclosure of Invention The invention aims to provide a restoration device and a restoration method for reducing an expansion sleeve, which are used for solving the problems of damaged grinding and milling and poor sealing performance of the expansion sleeve caused by the existing reduction restoration method. To achieve the purpose, the invention adopts the following technical scheme: the invention firstly provides a restoration device for reducing an expansion sleeve, which comprises the following steps of: a guide shoe, wherein a conical ball seat is arranged at the center of the guide shoe to receive a sealing ball; the pipe column anchor assembly comprises an anchor claw which can radially extend out to be anchored on the inner wall of the expansion sleeve; The pressure release valve assembly comprises a pressure release valve central pipe, a pressure release sliding sleeve and a first reset spring, wherein the bottom end of the pressure release valve central pipe is connected with the pipe column anchoring assembly, a pressure release hole is formed in the pipe wall of the pressure release valve central pipe, the first reset spring and the pressure release sliding sleeve are sleeved on the pressure release valve central pipe, the two ends of the first reset spring are respectively abutted to the top end of the pipe column anchoring assembly and the bottom end of the pressure release sliding sleeve, the top end of the pressure release sliding sleeve is abutted to the step surface of the outer side wall of the pressure release valve central pipe, and the pressure release sliding sleeve can slide along the axial direction of the pressure release valve central pipe to seal or open the pressure release hole; The expansion cone assembly comprises an expansion cone and a pushing sleeve, wherein the top end of the pushing sleeve is abutted to the bottom end of the expansion cone, a first liquid outlet hole is formed in the side wall of the pushing sleeve, the inner diameter of the pushing sleeve is larger than the outer diameter of the pressure release valve central tube, and the inner diameter of the pushing sleeve is smaller than the outer diameter of the pressure release sliding sleeve; The thrust hydraulic cylinder assembly comprises an upper central tube, a variant buckling joint, a lower central tube, a piston, an end cap and an outer sleeve, wherein the upper central tube is connected with the lower central tube through the variant buckling joint, the top end of the upper central tube is connected with the upper connector, the bottom end of the lower central tube is connected with the top end of the pressure release valve central tube, the outer sleeve is sleeved on the variant buckling joint, the piston is sleeved on the lower central tube, the bottom end of the piston penetrates through the expansion cone and is connected with the pushing sleeve, the top end of the expansion cone i