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Mine gas permeability improving method and device

A gas and mine technology, applied in the field of unconventional natural gas extraction, can solve the problems of slow gas desorption, low coal seam permeability, and low coalbed methane extraction efficiency.

Pending Publication Date: 2021-08-10
中国煤炭地质总局勘查研究总院
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Problems solved by technology

However, the disadvantages of the means of the prior art are that the coalbed methane (gas) anti-permeability means are relatively single, the effect is general, the extraction output is low and the cost is high, and the gas desorption speed is slow in the process, and due to the low permeability of the coal seam, Cause coal bed methane (gas) extraction efficiency is not high

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Embodiment Construction

[0026]In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0027] Combine below figure 1 A mine gas anti-reflection method of the present invention is described, comprising the following steps:

[0028] S1, inserting the pipeline 101 into the coal seam 100;

[0029] S2, connect pipeline 101 in parallel with liquid CO 2 supply unit 102 and fracturing fluid supply unit 103;

[0030] S3, injecting the high-temperature and high-pressure fracturing flu...

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Abstract

The invention relates to the technical field of unconventional natural gas extraction, in particular to a mine gas permeability improving method and device. The device comprises a pipeline, a liquid CO2 supply unit and a fracturing fluid supply unit, wherein the inner end of the pipeline is used for being placed in a coal seam, and the outer end of the pipeline is connected with the liquid CO2 supply unit and the fracturing fluid supply unit in parallel; and after the fracturing fluid supply unit injects high-temperature and high-pressure fracturing fluid into the coal seam through the pipeline, the liquid CO2 supply unit injects liquid CO2 into the coal seam through the pipeline. The mine gas permeability improving method and device provided by the invention have the advantages that the permeability of the coal seam can be effectively improved, the desorption speed of coal bed gas (gas) in the coal seam is accelerated, and the extraction efficiency of the coal bed gas (gas) can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of unconventional natural gas exploitation, in particular to a mine gas permeability enhancement method and device. Background technique [0002] In the existing technology, the drainage of coalbed methane (gas) in coal mining areas generally needs to increase the permeability of the coal seam to increase the gas production. At present, the main technical means to improve the permeability of the coal seam are hydraulic fracturing, CO 2 or N 2 Displacement, controllable shock wave anti-reflection, microwave heating technology, high-pressure hydraulic slotting technology, mining anti-reflection of coal seam protective layer and protected layer, etc. However, the disadvantages of the means of the prior art are that the coalbed methane (gas) anti-permeability means are relatively single, the effect is general, the extraction output is low and the cost is high, and the gas desorption speed is slow in the process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26E21B43/16
CPCE21F7/00E21B43/26E21B43/164Y02P90/70
Inventor 张春林谭克龙刘天绩赵欣孙杰袁建江
Owner 中国煤炭地质总局勘查研究总院
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