Method for detecting visual casing breaking water outlet point under nitrogen gas lift well

A detection method and water point technology, which can be used to detect the appearance of fluid at the leakage point, measurement, earthwork drilling and other directions, which can solve the problems of harsh detection conditions, inability to determine the leakage point, and inability to observe the leakage point of the casing. , to achieve the effect of improving the accuracy

Active Publication Date: 2020-04-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The embodiment of the present invention provides a nitrogen gas lift downhole visual casing break water point detection method, the first purpose of which is to solve the problems of harsh detection conditions and inaccurate detection results in the conventional casing break point detection technology; the second purpose is to solve the problem of The downhole visual logging can not observe the phenomenon of liquid leakage at the casing break point in the pressure balance casing damage well, and cannot determine the leakage point

Method used

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  • Method for detecting visual casing breaking water outlet point under nitrogen gas lift well
  • Method for detecting visual casing breaking water outlet point under nitrogen gas lift well
  • Method for detecting visual casing breaking water outlet point under nitrogen gas lift well

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no. 1 approach

[0042] refer to figure 1 , the first embodiment of the present invention relates to a nitrogen gas lift downhole visual casing break water point detection method, comprising the following steps:

[0043] S001. Select the wellbore suspected of casing damage as the target detection well, and process the wellbore of the target detection well;

[0044] S002. Lowering the tubing string to a place 9.5m to 10.5m above the liquid production level in the wellbore of the target detection well;

[0045] S003. Lowering the downhole television imaging tool to a place 4.5m to 5.5m below the bottom of the tubing string;

[0046] S004. Injecting compressed nitrogen gas into the annulus of the oil casing until a negative pressure is formed in the wellbore of the target detection well;

[0047] S005. Deploy the downhole TV imaging tool to below the liquid production surface in the wellbore of the target detection well, keep injecting compressed nitrogen into the annulus of the oil casing, and...

no. 2 approach

[0054] refer to figure 1 , this embodiment relates to a nitrogen gas lift downhole visualization casing break water point detection method, including the following steps:

[0055] S001. Select the wellbore suspected of casing damage as the target detection well, and process the wellbore of the target detection well;

[0056] refer to figure 2 , step S001 specifically includes the following:

[0057] S101. Drilling the wellbore of the target detection well;

[0058] S102. Drive a bridge plug above the perforation section of the target detection well, and set the bridge plug to seal the perforation section;

[0059] S103. Wash the well with clean water until the color of the outlet liquid is consistent with the color of the inlet liquid.

[0060] S002. Lowering the tubing string to a place 9.5m to 10.5m above the liquid production level in the wellbore of the target detection well;

[0061] S003. Lowering the downhole television imaging tool to a place 4.5m to 5.5m below t...

no. 3 approach

[0068] On the basis of the first embodiment, in the step S002, a tubing string with a horn head is selected as the string to be run into the wellbore of the target detection well.

[0069] The reason why the tubing string with a trumpet head is chosen as the tubing string to be lowered into the wellbore of the target detection well instead of the ordinary tubing is to facilitate the salvage of TV tools. If there is no horn head, the TV tool is easy to scratch the tubing .

[0070] As a preference, in the step S002, the tubing string with the trumpet head is lowered to 10 m above the liquid production level in the wellbore of the target detection well.

[0071] As a preference, in the step S003, the downhole television imaging tool is lowered to 5 m below the bottom of the tubing string.

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Abstract

The invention provides a method for detecting a visual casing breaking water outlet point under a nitrogen gas lift well. High-pressure nitrogen is injected into an oil jacket annulus to reduce the liquid density of a shaft so that pressure balance in the shaft is destroyed, the pressure of liquid in the shaft is reduced, the liquid flows out of holes of a perforation section, a casing breaking point and the like under the action of negative pressure, then the liquid outlet phenomenon of the casing breaking point is observed through an underground television, and the casing breaking point of the shaft is determined. Nitrogen gas lift and underground visual logging are combined together so that the problems that the liquid outlet phenomenon of the casing breaking point cannot be observed ina pressure balance casing damage well and a leakage point cannot be determined in the underground visual logging can be solved; the accuracy of the underground visual casing damage detection method is greatly improved and accurate wellbore information is provided for the later period of casing damage.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploitation, and in particular relates to a method for visually detecting the water outlet point of a nitrogen gas lift downhole. Background technique [0002] During the development of oil and gas fields, due to acidification, fracturing and corrosion of produced fluid, the casing is damaged and perforated to produce water, which affects the production of oil and gas wells. Therefore, once casing breakout occurs, it needs to be treated, and the prerequisite for effective treatment is to detect the perforation and leakage points of the wellbore. [0003] At present, the commonly used casing damage detection technology is mainly composed of MIT (multi-arm caliper imaging logging, full name Multi-Finger Imagining Tool) + MTT (magnetic wall thickness logging, full name Magnetic Thickness Tool), lead mold printing , double seal leak detection, downhole visualization, etc. [0004] However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/10E21B47/002G01M3/04
CPCE21B47/10G01M3/04
Inventor 梁万银王尚卫巨亚锋罗有刚张雄涛王虎白小佩江智强王嘉鑫陈晓丽
Owner PETROCHINA CO LTD
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