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Casing plugging method

A technology of casing and tubing, applied in the field of oil exploitation, can solve problems such as poor plugging effect and small diameter, achieve good plugging effect and ensure reliability

Active Publication Date: 2022-05-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a casing plugging method, which can solve the problems in the related art that the casing repaired by the expansion tube has a small diameter and poor plugging effect

Method used

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Embodiment Construction

[0052] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0053] figure 1 It is a flow chart of a casing plugging method provided by an embodiment of the present invention. The method can be used to seal the casing that is set in the well and has a lost section. refer to figure 1 As can be seen, the method can include:

[0054] Step 101, assembling the expansion tube system.

[0055] The expansion pipe system may include an expansion pipe string, and the expansion pipe string may be plastically deformed. The outer wall of the expansion pipe string may be provided with a rubber ring, and the rubber ring can attach the expansion pipe string to the inner wall of the casing to ensure the tightness between the expansion pipe string and the casing.

[0056] Step 102 , lowering the expansion pi...

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Abstract

The invention discloses a casing plugging method, which relates to the field of oil exploitation. The method can lower the assembled expansion pipe system to the target position, so that the expansion pipe string in the expansion pipe system is located at the leakage section of the casing. Then, the expansion pipe system can be pressed multiple times by the pump truck, so that the expansion head can squeeze the expansion pipe string multiple times in sections, so that the expansion pipe string can be plastically deformed section by section. In the process of segmentally extruding the expansion pipe string by the expansion head, the damage to the expansion pipe string is small, which ensures the reliability of plastic deformation of the expansion pipe string. Therefore, the thickness of the expansion pipe string can be designed to be small, and after the casing is blocked by using the expansion pipe string with a small thickness, the diameter of the casing is large and the plugging effect is good.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a casing plugging method. Background technique [0002] In the process of oil extraction, it is necessary to set casings in the well to support the well wall of the oil well or gas well. However, in the process of oil and gas exploration and oil and gas well stimulation operations, the casing is prone to deformation, wear, corrosion, perforation or collapse, resulting in casing leakage. [0003] In the related art, an expansion string is generally used to seal off the leakage section of the casing. However, in order to ensure the reliability of the plastic deformation of the expansion string during the expansion process, the thickness of the expansion string is relatively large, resulting in a small diameter of the casing repaired by the expansion string, and the plugging effect poor. Contents of the invention [0004] The invention provides a casing plugging method, which ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B29/10E21B33/12
CPCE21B29/10E21B33/1208
Inventor 张睿荫李晓娇杨中峰刘承炜江凌飞文云飞强海萍徐鑫
Owner PETROCHINA CO LTD
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