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Composite material patching method for long-section casing damage well

A composite material and composite material belt technology, which is applied in the fields of earth-moving drilling, wellbore/well components, climate sustainability, etc., can solve the problems of complex operation procedures and processes, and achieve the effect of high deformation strength and reduced outer diameter

Pending Publication Date: 2022-06-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of this process are: 1. When the casing damage section is long (generally >10m), the subsidized pipe must be equipped with a special threaded coupling and rubber sealing ring before hydraulic expansion
[0008] However, for long-section casing damage wells (generally >10m in length), the composite material circular pipe needs to be coiled on the drum in advance when running in the wellhead operation, and the whole lengthwise penetration of the tubing, coiled tubing and other operating strings is required. Or the outside of the cable, so that it can be continuously lowered into the well at one time, and the operation procedures and processes are more complicated

Method used

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  • Composite material patching method for long-section casing damage well
  • Composite material patching method for long-section casing damage well
  • Composite material patching method for long-section casing damage well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] In this example, a composite material subsidy method for a long casing damaged well is implemented in Well X-3. The depth of Well X-3 is 1883 m, the casing specification outer diameter × wall thickness = 139.7 mm × 7.72 mm, and the casing damage location is at 1051-1059m, the well temperature of the casing damaged section is about 40°C, the operation schematic diagram of the composite material subsidy method for the long casing damaged well is as follows figure 1 and Figure 5 shown, from figure 1 and Figure 5 It can be seen that it includes the following specific steps:

[0074] According to the casing specification, well temperature, casing damage and other working conditions, determine the casing subsidy process parameters:

[0075] According to the damage position of the casing 1051-1059m, the length of the subsidy pipe is 10m and the thickness is 3mm;

[0076] According to the outer diameter of the casing × wall thickness = 139.7 mm × 7.72 mm, the circumferenc...

Embodiment 2

[0088] In this example, a composite material subsidy method for a long casing damaged well is implemented in Well Y-3. The depth of Well Y-3 is 2208 m, the casing specification outer diameter × wall thickness = 139.7 mm × 9.17 mm, and the casing damage location is at 1420-1580m, the well temperature of the casing damaged section is about 55°C, and the composite material subsidy method for the long casing damaged well specifically includes the following steps:

[0089] According to the casing specification, well temperature, casing damage and other working conditions, determine the casing subsidy process parameters:

[0090] According to the damage position of the casing 1420-1580m, the length of the subsidy pipe is 180m and the thickness is 4mm;

[0091] According to the outer diameter of the casing × wall thickness = 139.7 mm × 9.17 mm, the circumference of the inner wall of the casing is calculated to be 381 mm, and the lateral width of the PTFE sheet is determined to be 400...

Embodiment 3

[0103] In this example, the composite material subsidy method for long casing damaged wells is implemented in Well JY-3. The depth of Well JY-3 is 2208 m, the outer diameter of casing specification × wall thickness = 139.7 mm × 9.17 mm, and the damage position of casing is at 1433-1593m, the well temperature of the casing damaged section is about 55℃;

[0104] The only difference between this example and Example 2 is that the composite material tape used in this example is made of bismaleimide shape memory polymer and carbon fiber reinforced material by molding and curing, and the bismaleimide shape memory The glass transition temperature of the polymer is 95-123°C, the deformation temperature is 70-75°C, and the cable heating temperature is 85°C.

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Abstract

The invention provides a composite material patching method for a long-section casing damage well. The composite material patching method comprises the steps that a composite material belt is adopted for conducting hole shrinkage binding and fixing on an organic material continuous pipe according to a certain interval; the composite material belt is made of a composite material with a shape memory effect, and the composite material with the shape memory effect expands when being heated; the outer diameter of the organic material continuous pipe is not smaller than the inner diameter of a to-be-patching sleeve; the outer surface of the organic material continuous pipe which is bound and fixed through the composite material belt in a reducing mode is coated with adhesive glue; the organic material continuous pipe is tripped into the casing damage section; the composite material belt is continuously heated to be expanded, then the binding effect of the composite material belt on the organic material continuous pipe is relieved, the outer diameter of the organic material continuous pipe is restored to the original state after the diameter of the organic material continuous pipe is expanded, and the organic material continuous pipe with the outer diameter restored to the original state and the damaged section of the to-be-patching sleeve form an attaching layer; and composite material patching of the long-section casing damage well is completed.

Description

technical field [0001] The invention relates to a composite material subsidy method for long casing damaged wells, belonging to the technical field of oil and gas field corrosion and protection. Background technique [0002] In oilfield production, steel casings of oil wells, gas wells or water injection wells are often exposed to CO 2 , H 2 S and / or oil, gas, water medium such as corrosive bacteria, or contact with corrosive measures such as acidizing, unplugging and other aggressive measures to the well, etc., resulting in local corrosion of the inner or outer wall of the casing, and then the formation of penetration Volumetric failure of the entire casing wall thickness destroys the integrity of the wellbore casing. This kind of damage often causes the formation water of the external formation to leak downwards into the production layer of the oil and gas well, causing the oil and gas to fail to be recovered, or cause the oil, gas and water medium in the well to break u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/10
CPCE21B29/10Y02P90/70
Inventor 李琼玮周志平石道涵潘宏文桂捷孙雨来谷成义杨立华郭钢王小勇刘静
Owner PETROCHINA CO LTD
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