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Underground expansion plugging mechanism

A technology of expansion pipe and expansion block, which is applied in the field of downhole expansion and plugging mechanism, can solve the problems of limited expansion coefficient and inability to adapt, and achieve the effects of controllable expansion diameter, wide application range and ensuring formation stability

Pending Publication Date: 2022-05-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the expansion coefficient of the existing method is still limited, and cannot adapt to the working conditions with high requirements on the expansion coefficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as Figure 1 to Figure 3 As shown, the downhole expansion plugging mechanism of this embodiment includes an outer expansion assembly 1 and an inner expansion assembly 2 . The inner expansion component 2 is arranged in the outer expansion component 1 to provide the expansion force of the outer expansion component 1 . The external expansion assembly 1 includes a coiled tubular body 11, an engaging part 12 and a tubular positioning member 13, wherein the coiled tubular body 11 is an expandable coiled tubular body 11, and the coiled tubular body 11 is made of a steel plate The overlapping parts of the coiled tube body 11 are engaged with each other through the engaging part 12, and the internal meshing angle of the engaging part 12 is set towards the moving direction of the outer ring of the coiled tube body 11. While the winding pipe body 11 is effectively expanded, it can effectively prevent the winding pipe body 11 from retreating after expansion; the pipe body pos...

Embodiment 2

[0049] Figure 5 It shows another embodiment of the downhole expansion plugging mechanism of the present invention. This embodiment is basically the same as Embodiment 1, the difference is that the external expansion assembly 1 of this embodiment also includes an external expansion tube 14, and the external expansion tube 14 is set There is an expansion opening 141 to provide expansion space for the outer expansion tube 14 . The outer expansion tube 14 is wrapped on the outer side of the coiled tube body 11 , and the combination of the outer expansion tube 14 and the coiled tube body 11 further improves the crush resistance of the coiled tube body 11 . At the same time, the positioning cones 15 are arranged on the outer wall of the outer expansion tube 14 , and a plurality of positioning cones 15 are arranged in a straight line along the length direction of the coiled tube body 11 .

[0050] In this embodiment, the expansion openings 141 of the external expansion tube 14 are ...

Embodiment 3

[0054] Figure 7 It shows another embodiment of the downhole expansion and plugging mechanism of the present invention. This embodiment is basically the same as Embodiment 2, the difference is that an expansion gap is left at the position of the expansion opening 141 of the outer expansion tube 14 of this example, and the expansion gap is the same as The engaging parts 12 located at the position of the coiled tubular body 11 are oppositely arranged. It enables the downhole expansion and sealing mechanism to expand evenly, and the outer expansion tube 14 can be closely attached to the casing to be repaired or the well wall.

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Abstract

The invention provides an underground expansion plugging mechanism which comprises an outer expansion assembly and an inner expansion assembly arranged in the outer expansion assembly to provide expansion acting force, the outer expansion assembly comprises an expandable winding type pipe body, a meshing part for preventing the winding type pipe body from retreating after expansion and a pipe body positioning part for fixing the position of the winding type pipe body, the overlapping parts of the winding type pipe body are mutually meshed through the meshing component, and the inner meshing angle of the meshing component is arranged towards the moving direction of the outer ring of the winding type pipe body; and the pipe body positioning piece is arranged at the position of the meshing part and is cut off when the winding type pipe body is expanded. The invention has the advantages of high expansion coefficient, no back-off after expansion, adjustable expansion diameter and the like.

Description

technical field [0001] The invention relates to the field of petroleum equipment, in particular to a downhole expansion and sealing mechanism. Background technique [0002] During the production process of oil and gas wells, due to formation or corrosion wear, the casing will be damaged or drilled into formations that are prone to collapse and leakage, resulting in the inability to safely drill to the designed depth and affecting downhole safety. Therefore, casing repair and sealing of easily collapsed and leaky formations has become an important remedial measure in the oilfield development process. The existing casing damage treatment mainly adopts methods such as shaping, milling, reinforcement, and casing removal. [0003] Among them, casing reinforcement is an important casing damage control technology, but casing reinforcement (such as bellows reinforcement, explosion welding reinforcement) has high requirements on the tightness of the pipe string. Specifically, epoxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/10
CPCE21B29/10
Inventor 刘彪张俊潘丽娟李双贵易浩王居贺李文霞李少安刘景涛刘仕银钟文建李光乔陈培亮孙伟光赫英状
Owner CHINA PETROLEUM & CHEM CORP
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