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CN-122014138-A - Casing patch device and patch method

CN122014138ACN 122014138 ACN122014138 ACN 122014138ACN-122014138-A

Abstract

The invention belongs to the technical field of petroleum well repair and discloses a casing repairing device and a casing repairing method. The sleeve repairing device comprises a center rod, a hydraulic cylinder, a bottom plug, an expansion rod group, an expansion cone sheet and an expansion pipe, wherein a liquid flow channel is arranged on the center rod along the axial direction of the center rod and used for introducing high-pressure liquid, the top end of the center rod is open, the bottom end of the center rod is closed, the hydraulic cylinder is arranged on the center rod and communicated with the liquid flow channel, the bottom plug is arranged on the center rod and fixedly connected with the center rod, the bottom plug is positioned below the hydraulic cylinder, two ends of the expansion rod group are respectively connected with the hydraulic cylinder and the bottom plug in a rotating mode, the expansion cone sheet is connected with the expansion rod group in a rotating mode, and the expansion pipe is sleeved on the outer side of the expansion cone sheet. The invention can be applied to casing repairing with an expanded section, has large outer diameter change range of the expansion pipe, better adapts to the size change of an external casing, expands the application range of the expansion pipe repairing, can be used in a small-size casing by matching with a thin-wall expansion pipe, and reduces the drift diameter loss in the casing to the greatest extent.

Inventors

  • SUN LIWEI
  • XIA YU
  • LUO HUAN
  • ZHU GAOLEI
  • LIANG DAPENG
  • YU MENG
  • WEI FUDE
  • WEI XIANG
  • KONG QINGDONG
  • ZHANG NAN
  • GUO ZIWEI
  • HUO AILI
  • LI SHUO
  • WANG YEHAN
  • HUO XIN
  • ZHONG YONG
  • LI HU
  • GAO QINGCHUN
  • LI PENG
  • TIAN KAIWEI
  • LIU YONGQUAN

Assignees

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

Dates

Publication Date
20260512
Application Date
20241112

Claims (11)

  1. 1. The sleeve patching device is used for patching the inner wall of the sleeve and is characterized by comprising the following components: The device comprises a central rod (1), wherein the central rod (1) is provided with a liquid flow channel along the axial direction of the central rod, the liquid flow channel is used for introducing high-pressure liquid, and the top end of the central rod (1) is open and the bottom end of the central rod is closed; The hydraulic cylinder (2) is arranged on the central rod (1) and is communicated with the liquid flow channel, and the high-pressure liquid in the liquid flow channel can drive the hydraulic cylinder (2) to move downwards along the central rod (1); The bottom plug (3) is arranged on the central rod (1) and is fixedly connected with the central rod (1), and the bottom plug (3) is positioned below the hydraulic cylinder (2); The two ends of the expansion rod group (4) are respectively connected with the hydraulic cylinder (2) and the bottom plug (3) in a rotating way, and when the hydraulic cylinder (2) moves downwards, the expansion rod group (4) rotates and expands along the radial direction of the central rod (1); The expansion cone piece (5), the expansion cone piece (5) is rotationally connected with the expansion rod group (4), and the expansion rod group (4) drives the expansion cone piece (5) to move along the radial direction of the central rod (1) when being rotationally expanded; The expansion pipe (6), expansion pipe (6) cover is located the outside of expansion cone piece (5), expansion cone piece (5) are followed when the radial direction of center pole (1) removes can support expansion pipe (6) synchronous expansion, make the outer wall of expansion pipe (6) with the sheathed tube inner wall supports and leans on in order to mend the sleeve pipe.
  2. 2. Sleeve patching device according to claim 1, characterized in that the hydraulic cylinders (2) and the bottom plugs (3) are respectively provided with a plurality of hydraulic cylinders (2) and a plurality of bottom plugs (3) which are alternately arranged along the axial direction of the central rod (1), and an expansion rod group (4) is rotatably arranged between any one hydraulic cylinder (2) and one bottom plug (3) below the hydraulic cylinder.
  3. 3. Sleeve patching device according to claim 1, characterized in that the expansion cone blades (5) are arranged parallel to the axial direction of the central rod (1), each expansion cone blade (5) being connected in rotation with a plurality of expansion rod groups (4) along the axial direction.
  4. 4. Sleeve patching device according to claim 1, characterized in that the central rod (1) is provided with a limit boss (11), and that the hydraulic cylinder (2) abuts against the limit boss (11) when the expansion rod group (4) is in a contracted state.
  5. 5. Sleeve patching device according to claim 4, characterized in that an elastic piece (7) is arranged between the limiting boss (11) and the hydraulic cylinder (2), and when the expansion rod group (4) is in a contracted state, the hydraulic cylinder (2) is abutted against the limiting boss (11) under the action of the elastic force of the elastic piece (7).
  6. 6. A casing patch device according to claim 1, wherein the bottom-most end plug (3) on the central rod (1) has an outer diameter larger than the outer diameter of the expansion tube (6) to support the bottom end of the expansion tube (6).
  7. 7. A casing patch device according to claim 1, wherein the expansion rod group (4) comprises a first rod group and a second rod group, the top end of the first rod group is rotatably connected with the hydraulic cylinder (2), the bottom end of the first rod group is rotatably connected with the top end of the second rod group, and the bottom end of the second rod group is rotatably connected with the bottom plug (3).
  8. 8. A casing patch device according to claim 7, wherein the first and second rod sets each comprise a plurality of expansion rods (41), the plurality of expansion rods (41) being evenly spaced around the circumference of the central rod (1).
  9. 9. The casing patch device according to claim 1, wherein the expansion rod group (4) comprises a first rod group and a second rod group, wherein the top end of the first rod group is rotationally connected with the hydraulic cylinder (2), the bottom end of the first rod group is rotationally connected with the expansion cone sheet (5), the top end of the second rod group is rotationally connected with the expansion cone sheet (5), and the bottom end of the second rod group is rotationally connected with the bottom plug (3).
  10. 10. A casing patch method, characterized by applying the casing patch device according to any one of claims 1 to 9, the casing patch method comprising the steps of: s1, when an expansion rod group (4) is in a contracted state, an expansion pipe (6) is sleeved outside a plurality of expansion cone sheets (5), and the bottom end of the expansion pipe (6) is contacted with a bottom plug (3) at the bottommost end; s2, the sleeve patching device is put into a position to be patched in a sleeve; S3, introducing high-pressure liquid into a liquid flow channel of the central rod (1), and pushing the liquid cylinder (2) to extrude the expansion rod group (4) to rotate and expand and push the expansion cone sheet (5) to move along the radial direction of the central rod (1), wherein the expansion pipe (6) is inflated and attached to the inner wall of the sleeve so as to patch the position to be patched in the sleeve.
  11. 11. The casing patching method according to claim 10, further comprising the step of S4, when the hydraulic cylinder (2) is moved in place, rotating the central rod (1) and moving up and down so that the expansion tube (6) is fully expanded, then decompressing so that the expansion rod group (4) is contracted, and then lifting the central rod (1) to complete the patching.

Description

Casing patch device and patch method Technical Field The invention relates to the technical field of petroleum well repair, in particular to a casing repairing device and a casing repairing method. Background The casing damage phenomenon occurs along with the development of the oil field to the middle and later stages, and the large-scale volumetric fracturing implementation can also cause casing damage, casing deformation and casing leakage in the shale gas and shale oil exploitation process. The expansion pipe patching technology has the advantages of large inner diameter, high bearing capacity and the like after patching, and becomes an effective means for repairing damaged casing. The expansion pipe patching tool generally comprises an expansion cone, a bottom plug, an expansion pipe and the like. The outer diameter of the bottom of the expansion pipe is larger, into which the expansion cone is placed. The expansion cone, the bottom plug and the expansion pipe between the expansion cone and the bottom plug form a sealed cavity, high-pressure liquid is injected into the cavity to push the expansion cone to move upwards, the expansion pipe is inflated and tightly attached to the external damaged casing, and the expansion cone and the bottom plug are matched with a rubber ring outside the expansion pipe to form reliable sealing, so that the aim of recovering the tightness in the casing is fulfilled. In the field implementation, if the inner diameter of the deformation section of the sleeve is enlarged and is larger than the inner diameter of the sleeve at the upper part, after the expansion pipe patching tool is put in, the outer diameter of the expansion pipe after expansion is small and cannot be attached to the inner wall of the sleeve. Meanwhile, the wall thickness of the expansion pipe is generally 6-10mm, the inner diameter loss after the repairing is 12-20mm, and for a small-size casing damage well, the inner diameter loss after the repairing is larger, the subsequent down-hole tool is influenced, and if the expansion pipe with smaller wall thickness is used, the high pressure of liquid in the expansion process cannot be borne. Therefore, the current expansion pipe patching tool is limited by an implementation principle and a self structure, cannot patch and repair the deformed and expanded section of the sleeve, cannot meet the use requirement of small-size sleeve patching, and has certain limitation. Disclosure of Invention The invention aims to provide a sleeve patching device and a patching method, which are used for patching and repairing a deformed and expanded diameter section of a sleeve, and the internal diameter loss is smaller after patching. To achieve the purpose, the invention adopts the following technical scheme: a casing repairing device is used for repairing the inner wall of a casing and comprises: the central rod is provided with a liquid flow channel along the axial direction of the central rod for introducing high-pressure liquid, and the top end of the central rod is open and the bottom end of the central rod is closed; The hydraulic cylinder is arranged on the central rod and is communicated with the liquid flow channel, and the high-pressure liquid in the liquid flow channel can drive the hydraulic cylinder to move downwards along the central rod; the bottom plug is arranged on the central rod and fixedly connected with the central rod, and the bottom plug is positioned below the hydraulic cylinder; The two ends of the expansion rod group are respectively connected with the hydraulic cylinder and the bottom plug in a rotating way, and when the hydraulic cylinder moves downwards, the expansion rod group rotates and expands along the radial direction of the central rod; The expansion cone piece is rotationally connected with the expansion rod group, and the expansion cone piece is driven to move along the radial direction of the central rod when the expansion rod group is rotationally expanded; The expansion pipe is sleeved on the outer side of the expansion cone, and the expansion cone can support the expansion pipe to expand synchronously when moving along the radial direction of the central rod, so that the outer wall of the expansion pipe abuts against the inner wall of the sleeve to patch the sleeve. In some embodiments, the hydraulic cylinders and the bottom plugs are respectively provided with a plurality of hydraulic cylinders and a plurality of bottom plugs, the hydraulic cylinders and the bottom plugs are alternately arranged along the axial direction of the central rod, and an expansion rod group is rotatably arranged between any one hydraulic cylinder and one bottom plug below the hydraulic cylinder. In some embodiments, the expansion cone blades are disposed parallel to an axial direction of the central rod, each expansion cone blade rotationally connecting a plurality of the expansion rod sets in the axial direction. In some embodiments, the central rod is provid