Thermal expansion casing pipe shackle method and device

An expansion casing and thermal technology, applied in casing, drill pipe, earthwork drilling, etc., can solve the problems of shackle failure, adhesion between the pipe body and the coupling thread connection, etc.

Pending Publication Date: 2021-11-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To replace the casing, in fact, it is to disassemble two of the casings, that is, to disassemble one of the two adjacent casings and the coupling shackle connected between the two, so as to replace the casing. However, in the prior art, the threaded connection between the pipe body and the coupling usually sticks, resulting in failure of the shackle

Method used

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  • Thermal expansion casing pipe shackle method and device

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Effect test

Embodiment 1

[0036] The present invention provides a method for breaking off a heat expansion casing, wherein the method for breaking off a heat expansion casing includes:

[0037] In the inside of the casing, the part of the casing to be disassembled is continuously heated, so that the ends of the two pipe bodies at the part of the casing to be disassembled and the couplings connecting the two pipe bodies are heated to the same temperature to ensure that the two The expansion state of the pipe body and the coupling is the same;

[0038] Apply breakout torque to the casing at the wellhead so that the casing is always under stress;

[0039] In the inside of the casing, cool the part of the casing to be disassembled, so that the temperature of the two pipe bodies is lower than the temperature of the coupling, so that a gap is formed between the two pipe bodies and the coupling due to thermal expansion and contraction;

[0040] Since the shackle torque is always applied to the casing, at thi...

Embodiment 2

[0053] Such as figure 1 As shown, the present invention also provides a thermal expansion casing breakout device, wherein the thermal expansion casing breakout device includes: a central pipe 1, a first packer 2 and a second packer 3, the first packer Both the packer 2 and the second packer 3 are sealed and positioned and sleeved on the center pipe 1, and the first packer 2 and the second packer 3 can be respectively connected to the two pipe bodies 5 of the casing to be disassembled. The inner surfaces of the pipes are sealed and positioned so that the connection between the two pipe bodies 5 is located between the first packer 2 and the second packer 3, the two pipe bodies 5, the collar 6 connecting the two pipe bodies 5, The first packer 2, the second packer 3 and the central pipe 1 enclose and form a closed annular space. By passing chemicals into the annular space, the ends of the two pipe bodies 5 and the joints connecting the two pipe bodies 5 can be sealed. The coupli...

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Abstract

The invention provides a thermal expansion casing pipe shackle method and device. The method comprises the steps that the to-be-split position of a casing pipe is continuously heated in the casing pipe, and the ends of two pipe bodies at the to-be-split position of the casing pipe and a coupling connecting the two pipe bodies are heated to the same temperature; shackle torque is applied to the casing pipe at a wellhead; the to-be-split position of the casing pipe is cooled in the casing pipe, the temperature of the two pipe bodies is lower than that of the coupling, and gaps are generated between the two pipe bodies and the coupling; and under the effect of the shackle torque, one of the two pipe bodies is screwed and split from the coupling, and shackle of the casing pipe is completed. The device is used for implementing the method. The characteristic of thermal expansion and cold contraction of metal is effectively utilized, the gaps are generated between the two pipe bodies and the coupling, at the moment, any one of the two pipe bodies at the to-be-split position of the casing pipe can be rapidly separated from the coupling through the shackle torque applied to the casing pipe through the wellhead, and the casing pipe is split.

Description

technical field [0001] The invention relates to the technical field of casing construction, in particular to a method and device for breaking out a thermal expansion casing. Background technique [0002] Heavy oil reserves are relatively abundant in my country's oilfields, but with the increase in the development time of heavy oil reservoirs, the casing is seriously damaged and needs to be replaced. Wherein, the casing is composed of a plurality of pipe bodies connected in sequence, wherein every two adjacent pipe bodies are threadedly connected by a collar. To replace the casing, in fact, it is to disassemble two of the casings, that is, to disassemble one of the two adjacent casings and the coupling shackle connected between the two, so as to replace the casing. However, in the prior art, the threaded connection between the pipe body and the coupling usually sticks, resulting in failure of the shackle. Contents of the invention [0003] The purpose of the present inven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B19/16E21B17/08
CPCE21B19/16E21B17/08
Inventor 戚勇马振涛于丽宏于雷靳建光杨滨宇何正彪陈悦吕春柳刘森方新民温云鹏张博李亚彤赵晶晶崔正宗
Owner PETROCHINA CO LTD
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