Method of using anaerobic methane-oxidizing bacteria to improve gas permeability of coal seam

An anaerobic methane, oxidizing bacteria technology, applied in earth-moving drilling, wellbore/well components, production fluids, etc., can solve problems such as gas gushing, hidden safety hazards, hole stability and porosity impact, etc.

Inactive Publication Date: 2019-04-05
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0002] The existing downhole anti-reflection treatment technology commonly used for coal seams with poor air permeability and high gas content is mainly hydraulic fracturing, and its technical steps are mainly drilling, sealing, fracturing, drainage, and gas extraction. The change of air permeability cannot meet the requirements. For example, in order to achieve the effect of drainage in the project, it often takes several months, which seriously affects the construction period
If dense holes are arranged for fracturing, the coal body will be unstable, and the stability and porosity of the holes will be affected. On the contrary, it is easy to promote the gas gushing out too quickly, causing gas outburst, and causing safety hazards. Difficult to maintain the hole and cost a lot of money

Method used

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  • Method of using anaerobic methane-oxidizing bacteria to improve gas permeability of coal seam

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specific Embodiment approach

[0013] A kind of coal bed anti-permeability method utilizing anaerobic methane oxidizing bacteria of the present invention, its preferred embodiment is:

[0014] The characteristics of the hole described in step S101 are: the extending direction of the hole should be downward, and the axis of the hole should maintain an inclination angle of 3 / 1000 with the horizontal plane of the hole, and the hole wall should be flat, and the part of the hole wall that is protruding or depressed The maximum distance from the axis of the hole should not exceed 1.5cm, the diameter of the hole should be 100mm, and the length of the hole should be determined according to the actual engineering needs.

[0015] The piping arrangement described in step S103 is characterized by including a bacteria injection pipe 1 and an air extraction pipe 2 . The characteristic of bacteria injection tube 1 is that an end stretching towards the bottom of the hole should be 20-25cm away from the bottom of the hole, ...

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Abstract

The invention belongs to the technical field of coal mine gas drainage and relates to a method of using anaerobic methane-oxidizing bacteria to improve gas permeability of a coal seam. Modifications and innovations are made based on the traditional hydrofracturing technique through biological treatments. The method herein mainly includes: drilling an oblique hole in coal, flushing the hole with water, placing a pipeline, adding anaerobic methane-oxidizing bacteria into a fracturing fluid to fracture the coal, and adding an anaerobic methane-oxidizing bacterial liquid into the hole at certain time intervals after fracturing. The method is suitable for better improving the gas permeability of the coal seam, so that gas drainage efficiency and effect are improved, and gas drainage time is shortened; the bacterial liquid is reused, so that the cost is reduced; the method has a good application prospect and good economic effect.

Description

technical field [0001] The method belongs to the field of biological prevention and control of coal mine gas. The method utilizes the characteristics of microorganisms and combines with engineering practice to improve the air permeability coefficient of the coal seam, and is an innovation to the existing anti-permeability technology of the underground coal seam of the coal mine. Background technique [0002] The existing downhole anti-reflection treatment technology commonly used for coal seams with poor air permeability and high gas content is mainly hydraulic fracturing, and its technical steps are mainly drilling, sealing, fracturing, drainage, and gas extraction. The change of air permeability cannot meet the requirements. For example, in order to achieve the effect of drainage in the project, it often takes several months, which seriously affects the construction period. If dense holes are arranged for fracturing, the coal body will be unstable, and the stability and po...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/26
CPCE21B43/006E21B43/16E21B43/26
Inventor 杨小彬裴艳宇刘隽嘉吴伟达
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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