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A Leak Detection Method for Gas Injection String in Oil and Gas Field

A technology for gas injection pipes and oil and gas fields, which is applied in construction and other directions, can solve the problems that it is difficult to determine the type of tracer and run in the tracer detection instrument, it is difficult to find leaks when pulling out the pipe string, and it is difficult to determine the location of leaks, etc., to achieve The effect of continuous visualization to find leaks, low risk, and short construction period

Active Publication Date: 2022-03-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Tracer detection is the method of finding pipe string leaks. For different gas injection gases, it is difficult to determine the type of tracer and it is difficult to run the tracer detection instrument in the wellbore with the completion string. It is difficult to determine the specific The location of the leak point
[0005] The method of pulling out the pipe string to find leaks, because the threaded thread leakage usually occurs under the stress state of the wellbore and the threaded thread usually has no obvious damage, it is difficult to find the leak point even when the pipe string is pulled out, and the leak point search is blind and difficult. look up

Method used

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  • A Leak Detection Method for Gas Injection String in Oil and Gas Field
  • A Leak Detection Method for Gas Injection String in Oil and Gas Field
  • A Leak Detection Method for Gas Injection String in Oil and Gas Field

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no. 1 approach

[0047] The first embodiment of the present invention relates to a method for finding leaks in gas injection strings in oil and gas fields. figure 1 , including the following steps:

[0048] Step S1, selecting injection wells with pressure in the annulus and suspected leakage as target wells;

[0049] Step S2, lowering the plug 1 to the designated position of the gas injection string 2 in the target well, and igniting and setting the plug 1;

[0050] In step S3, the target well continues blowout, and at the same time, the annular space is suppressed to establish the internal and external pressure difference of the gas injection string 2;

[0051] Step S4, lower the downhole TV tool 4 to the top of the plug 1, lift the downhole TV tool 4 to find and record the leakage point of the gas injection string 2 above the plug 1, until the leak detection of the complete gas injection string 2 is completed, Take out the downhole TV tool 4;

[0052] Step S5, salvage the plug 1, and comp...

no. 2 approach

[0057]Different from the first embodiment, this embodiment provides indicators and basis for suspected leakage of the injection well. Specifically, the suspected leakage injection well mentioned in step S1 refers to the annular zone pressure of the injection well greater than 2MPa.

no. 3 approach

[0059] The second embodiment of the present invention relates to a method for finding leaks in gas injection strings in oil and gas fields. figure 1 , including the following steps:

[0060] Step S1, selecting injection wells with pressure in the annulus and suspected leakage as target wells;

[0061] Step S2, lowering the plug 1 to the designated position of the gas injection string 2 in the target well, igniting and setting the plug 1, such as figure 2 As shown, it specifically includes the following steps:

[0062] In step S201, a gas injection tree is installed at the wellhead of the target well, and the gas injection tree is connected to the discharge pipe;

[0063] Step S202, the cable lowers the plug 1 to the designated position of the gas injection string 2 in the target well;

[0064] Step S203, start the ground controller connected with the cable of the plug 1, and ignite and set the plug 1.

[0065] In step S3, the target well continues blowout, and at the same...

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Abstract

The invention protects a method for finding leaks of gas injection pipe strings in oil and gas fields, and belongs to a method for finding leaks of gas injection pipe strings for injection wells. In this method, it is proposed to use the plugging device to match the downhole TV, combined with the method of annulus pressure, to realize the purpose of implementing leak point inspection on the gas injection string. Compared with the current leak-finding method, this method uses downhole TV to detect and observe the inner wall of the gas injection string in real time, which is intuitive and efficient; this method uses downhole TV to find leaks in gas injection wells, which is convenient and quick, and the result is accurate; Methods The construction procedure is simple and the detection results are reliable, which provides a new method for leak detection of injection well completion strings in oil and gas fields.

Description

technical field [0001] The invention belongs to the field of measuring the leakage, intrusion or movement of certain liquids in boreholes or wells, and in particular relates to a method for finding leaks of gas injection pipe strings in oil and gas fields. Background technique [0002] At present, many old oil fields have entered the stage of tertiary oil recovery. 2 , associated gas and other gas flooding to exploit oil and gas reservoirs. For gas injection wells, the gas-tight performance of the gas injection string is the core issue. Although the completion of injection wells in major oilfields generally uses special tubing equipped with gas-tight buckles such as BGT and FOX, but due to the The combination of factors such as pipe string expansion and contraction caused by pipe string temperature and pressure changes and pipe string self-weight caused thread leakage in some completion strings, and the ideal sealing state cannot be achieved. Gas leaking into the annulus m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/117E21B47/002
Inventor 刘忠能王在强王治国郭思文王效明胡相君薛晓伟赵广民蒙鑫王石头
Owner PETROCHINA CO LTD
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