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Method for identifying leakage point of casing-damaged oil well

A leakage point and oil well technology, which is applied in the identification of the water output position of casing damaged oil wells and the leakage point identification of casing damaged oil wells, can solve the problems of casing damage caused by packers, unfavorable wellbore integrity, and complicated process.

Pending Publication Date: 2020-11-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional engineering logging (MIT+MTT) judges the corrosion, scaling or perforation of the casing by detecting the change of casing inner diameter and thickness, but it cannot identify whether the perforation point has water, and the leak detection of the packer can roughly find out the location of the leak point. However, the packer needs to be set repeatedly, the process is cumbersome, and the efficiency is low, and the packer will damage the casing, which is not conducive to the integrity of the wellbore

Method used

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  • Method for identifying leakage point of casing-damaged oil well
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  • Method for identifying leakage point of casing-damaged oil well

Examples

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Effect test

Embodiment 1

[0044] This embodiment provides a method for identifying the leakage point of a casing damaged oil well. The fluid flow is generated by artificial excitation in the wellbore, and the noise logging instrument is used to measure the noise amplitude and frequency generated when the fluid flows in the cement ring tunnel or formation outside the pipe. To determine the location of fluid generation, and combine well temperature, flow and other instruments to improve the accuracy and success rate of leak finding and channel finding. Specific steps are as follows:

[0045] S1, the original well string is lifted out, and the well is cleaned to the bottom of the well with a pass gauge to scrape the bridge plug near the setting position.

[0046] S2, the bridge plug (perforation section 1530.00-1533.00m) is available for setting at 1528m. According to the setting position of the bridge plug, the tubing and bell mouth are lowered according to the engineering design.

[0047] S3, install fracturi...

Embodiment 2

[0054] This embodiment provides a method for identifying the leakage point of a casing damaged oil well. The fluid flow is generated by artificial excitation in the wellbore, and the noise logging instrument is used to measure the noise amplitude and frequency generated when the fluid flows in the cement ring tunnel or formation outside the pipe. To determine the location of fluid generation, and combine well temperature, flow and other instruments to improve the accuracy and success rate of leak finding and channel finding. Specific steps are as follows:

[0055] S1, the original well string is lifted out, and the well is cleaned to the bottom of the well with a pass gauge to scrape the bridge plug near the setting position.

[0056] S2, set the soluble bridge plug at 1767m (perforation section 1769-1772m), and lower the tubing and bell mouth according to the engineering design.

[0057] S3, install fracturing or water injection wellhead, socket injection and blowout process.

[005...

Embodiment 3

[0063] This embodiment provides a method for identifying the leakage point of a casing damaged oil well. The fluid flow is generated by artificial excitation in the wellbore, and the noise logging instrument is used to measure the noise amplitude and frequency generated when the fluid flows in the cement ring tunnel or formation outside the pipe. To determine the location of fluid generation, and combine well temperature, flow and other instruments to improve the accuracy and success rate of leak finding and channel finding. Specific steps are as follows:

[0064] S1, the original well string is lifted out, and the well is cleaned to the bottom of the well with a pass gauge to scrape the bridge plug near the setting position.

[0065] S2, set the soluble bridge plug at the expected depth, and lower the tubing and bell mouth according to the design.

[0066] S3, install fracturing or water injection wellhead, socket injection and blowout process.

[0067] S4: Use a pump truck to injec...

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Abstract

The invention provides a method for identifying a leakage point of a casing-damaged oil well. According to the method, a fluid flow is generated in a wellbore by artificial excitation, a noise logginginstrument is used for measuring noise amplitude and frequency generated when the fluid flows in a cement ring tunnel or the formation outside a pipe to determine the location of fluid generation, and the accuracy and success rate of leakage finding and channel finding are improved in combination with well temperature, flow and other instruments. By adopting the method provided by the invention,watered points of casing-damaged oil wells can be identified accurately and quickly, and effective guidance can be provided for the management of the casing-damaged oil wells by means of separate production, casing patching and chemical plugging.

Description

Technical field [0001] The invention belongs to the technical field of oil production engineering, and specifically relates to a method for identifying the leakage point of a casing damaged oil well, which is used for identifying the water outlet position of a casing damaged oil well. Background technique [0002] With the extension of the service life of oil and water wells, casing perforation occurs due to oil production, water injection, operation, cementing quality, casing material, produced water corrosion and other reasons, which directly affects the service life of oil and water wells, oil and gas production and water injection effects. Corrosion and perforation casing damage wells are usually treated by isolating or plugging the water outlet point to continue oil production. First, it is necessary to find out the location of the casing damage well leakage point. [0003] Conventional engineering logging (MIT+MTT) judges the casing corrosion, scaling or perforation by detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/107E21B49/00
CPCE21B49/00
Inventor 白小佩马能平张雄涛王尚卫罗有刚刘江波梁万银王嘉鑫江智强赵鹏玉
Owner PETROCHINA CO LTD
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