Damage patching and repairing method based on memory alloy and for expandable tubular

A memory alloy and repair method technology, which is applied in earth-moving drilling, wellbore/well components, etc., can solve the problems of easy occurrence of downhole accidents, low construction efficiency, complex mechanism, etc., and achieves convenient preparation, improved success rate, and broad application. Foreground effect

Inactive Publication Date: 2018-10-16
CNPC TUBULAR GOODS RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of complex structure, poor corrosion resistance, low construction efficiency and easy occurrence of downhole accidents in the expansion construction method of the existing solid expansion pipe, and to provide a method for subsidizing the casing damage of the expansion pipe based on memory alloy. The construction is simple, the reliability is high, the accidents in the expansion pipe construction operation can be reduced, the cost can be effectively reduced, the success rate of the construction operation can be improved, and it has broad application prospects

Method used

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  • Damage patching and repairing method based on memory alloy and for expandable tubular
  • Damage patching and repairing method based on memory alloy and for expandable tubular
  • Damage patching and repairing method based on memory alloy and for expandable tubular

Examples

Experimental program
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Effect test

Embodiment 1

[0049] 1) Select 24 Ti-Ni memory alloy wires with a diameter of 4 mm to make a 125 mm outer diameter and a 9 mm wall thickness memory alloy expansion sleeve damage compensation tool, wherein the memory alloy wire mesh adopts a Ti-Ni-based shape memory alloy Made of silk, it has a good shape memory effect. The elastic sealing material tube 4 is made of cyanide-butadiene rubber, which has a large elastic deformation capacity and high-pressure resistance;

[0050] 2) Accurately measure the location and internal dimensions of the damaged casing section with an outer diameter of 140 mm and a wall thickness of 7.72 mm, and use casing milling or shaping tools to reshape and clean the inside of the casing;

[0051] 3) Put the memory alloy expansion sleeve damage compensation tool on the ground in a liquid nitrogen box (temperature is less than minus 20 degrees), and apply uniform stress on both ends to elongate the memory alloy expansion sleeve damage compensation tool, so that the mem...

Embodiment 2

[0057] 1) Select 223 mm outer diameter and 19 mm wall thickness memory alloy expansion sleeve damage compensation tool made of 16 Ti-Ni-V memory alloy wires with a diameter of 9 mm, in which the memory alloy wire mesh is made of Ti-Ni-V The shape memory alloy wire is woven, which has a good shape memory effect. The elastic sealing material tube is made of fluorobutane rubber, which has a large elastic deformation capacity and high temperature and high pressure resistance;

[0058] 2) Accurately measure the position and internal dimensions of the casing damaged section with an outer diameter of 244.5 mm and a wall thickness of 12 mm, and use casing milling or shaping tools to reshape and clean the inside of the casing;

[0059] 3) Put the memory alloy expansion sleeve damage compensation tool on the ground in a low-temperature cold box (temperature is less than zero), and apply uniform stress on both ends to elongate the memory alloy expansion sleeve damage compensation tool, so...

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Abstract

The invention relates to a damage patching and repairing method based on memory alloy and for an expandable tubular. The problems of complicated mechanisms, poor corrosion resistance, low constructionefficiency and downhole accidents prone to occurring in an existing construction method are solved. The damage patching and repairing method comprises the steps that (1) a memory alloy expandable tubular damage patching tool is selected or prepared; (2) a casing milling or shaping tool is lowered in advance to perform reshaping and cleaning on unsuitable positions; (3) the memory alloy expandabletubular damage patching tool is placed in a low temperature environment, the uniform stress is applied at both ends of the memory alloy expandable tubular damage patching tool to lengthen the memoryalloy expandable tubular damage patching tool; (4) the memory alloy expandable tubular damage patching tool and a heating rod disposed in the memory alloy expandable tubular damage patching tool are lowered and sent into the damaged expandable tubular together; (5) after installation in place is completed, the heating rod is energized by a cable; and (6) after the memory alloy expandable tubular damage patching tool is completely deformed, the heating rod is powered off and taken out, and patching and repairing of the damaged expandable tubular is completed.

Description

technical field [0001] The invention relates to the fields of oil and gas industry oil casing damage repair and well completion operations, in particular to a memory alloy-based expansion pipe casing damage subsidy repair method, which is convenient for on-site operation and construction in oil fields, and can be widely applied to old oil casings in oil fields Tube repair. Background technique [0002] Solid Expandable Casing SET (Solid Expandable Tubular) technology is a new drilling, completion and workover technology that radially expands the casing string to the required diameter in the wellbore for the purpose of "saving" the borehole size . Expandable tube technology has been successfully applied to the sealing of downhole complex formations such as sand prevention in oil well production layers, collapse prevention in easy-to-collapse formations, plugging of lost formations, expansion liner hangers, repair of damaged casings in oil wells, and drilling , well completi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/10
CPCE21B29/10
Inventor 刘强李琼玮白强杨立华宋生印汪蓬勃孙雨来周志平
Owner CNPC TUBULAR GOODS RES INST
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