Method for inspecting casing leakage in coal-bed gas well

A coalbed methane well and casing technology, which is applied in construction and other fields, can solve the problems of inconvenient casing inspection and achieve the effects of reducing cost investment, reducing weight and water pressure, and avoiding environmental pollution

Pending Publication Date: 2019-12-13
山西蓝焰煤层气集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem in the prior art that it is inconvenient to accurately inspect casings, the present invention provides a method for inspecting casing leakage in coalbed methane wells

Method used

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  • Method for inspecting casing leakage in coal-bed gas well

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] refer to figure 1 , a method for checking casing leakage in a coalbed methane well, comprising the following steps:

[0023] S1: Seal the bottom of the tool string with the bottom ball, then put the tool string into the production casing, and pressurize from the top opening of the tool string. When the tool string is pressurized at 0.8-1.0MPa, two sets of packers are set. When pressurizing, the pressure is monitored through the pressure gauge. The pressure gauge is connected to the controller, and the controller is connected to the pressurizer. The model of the packer is K344. The controller can preset the pressure value. When the pressure gauge detects If the pressure value is not within the preset range, the controller controls the pressurizer to adjust the pressure. When pressurizing, the temperature sensor detects the temperature data in the bushing and records the detected data. The temperature sensor and The display screen is connected, and the display screen is ...

Embodiment 2

[0030] refer to figure 1 , a method for checking casing leakage in a coalbed methane well, comprising the following steps:

[0031] S1: Seal the bottom of the tool string with the bottom ball, then put the tool string into the production casing, and pressurize from the top opening of the tool string. When the tool string is pressurized at 0.8-1.0MPa, two sets of packers are set. When pressurizing, the pressure is monitored through the pressure gauge. The pressure gauge is connected to the controller, and the controller is connected to the pressurizer. The model of the packer is K344. The controller can preset the pressure value. When the pressure gauge detects If the pressure value is not within the preset range, the controller controls the pressurizer to adjust the pressure. When pressurizing, the temperature sensor detects the temperature data in the bushing and records the detected data. The temperature sensor and The display screen is connected, and the display screen is ...

Embodiment 3

[0038] refer to figure 1 , a method for checking casing leakage in a coalbed methane well, comprising the following steps:

[0039] S1: Seal the bottom of the tool string with the bottom ball, then put the tool string into the production casing, and pressurize from the top opening of the tool string. When the tool string is pressurized at 0.8-1.0MPa, two sets of packers are set. When pressurizing, the pressure is monitored through the pressure gauge. The pressure gauge is connected to the controller, and the controller is connected to the pressurizer. The model of the packer is K344. The controller can preset the pressure value. When the pressure gauge detects If the pressure value is not within the preset range, the controller controls the pressurizer to adjust the pressure. When pressurizing, the temperature sensor detects the temperature data in the bushing and records the detected data. The temperature sensor and The display screen is connected, and the display screen is ...

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Abstract

The invention belongs to the field of casing leakage inspection and in particular relates to a method for inspecting casing leakage in a coal-bed gas well. For the problem that an existing method is inconvenient to accurately inspect a casing, the following scheme is provided; the method for inspecting the casing leakage in the coal-bed gas well comprises the following steps of S1, sealing the bottom of a tool string by using a bottom ball, and then placing the tool string in a production casing, pressurizing the tool string from a top opening of the tool string, and packing the tool string byusing two sets of packers when the tool string is pressurized to 0.8-1.0 MPa; and S2, continuing to pressurize the tool string to 1.5-2.0 MPa to reach a water distributor opening pressure, enabling awater distributor to discharge liquid, carrying out pressure holding verification on the casing damage degree between two sealing compartments; if leakage is caused, continuing the next procedure. According to the method for inspecting the casing leakage in the coal-bed gas well, whether the casing is damaged or not can be accurately found out, and the upper limit and the lower limit of the casing damage can be accurately determined to provide accurate data support for follow-up well casing repairing and guarantee the follow-up smooth development of the coal-bed gas well; and the method for inspecting the casing leakage in the coal-bed gas well is beneficial for realizing stable and high yield of the coal-bed gas well.

Description

technical field [0001] The invention belongs to the technical field of casing leakage inspection, in particular to a method for inspecting casing leakage in coalbed gas wells. Background technique [0002] As the integrity of the casing in the early stage and later stage of coalbed methane development directly affects the production of coalbed methane production, the integrity of the casing in the early stage of drilling and the integrity of the casing when there is a problem in the process of fracturing construction and the integrity of the casing in the later stage of mining , all need to be clearly implemented. The current casing detection technologies include: packer sealing leak detection, well temperature leak detection, multi-arm caliper measurement technology, downhole TV camera technology, ultrasonic imaging technology, etc. The well temperature logging can only be used as a reference, and the location of the leak point cannot be determined, so as to provide clear d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/117
Inventor 于振锋乔晋王森宋新亚苗峰靳科科何庆宏云剑魏若飞黄帆
Owner 山西蓝焰煤层气集团有限责任公司
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