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Drilling methane self-circulation blasting fracturing enhanced extraction method

A detonation fracturing and methane technology, applied in earthwork drilling, mining fluid, measurement, etc., can solve problems such as uneven mixing, methane detonation range and effect limitations

Active Publication Date: 2021-05-07
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

The existing drilling methane detonation method is to inject combustion accelerant and methane premix into the borehole, which is likely to cause uneven mixing and limit the scope and effect of methane detonation

Method used

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  • Drilling methane self-circulation blasting fracturing enhanced extraction method

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Embodiment Construction

[0021] Below in conjunction with the implementation in the accompanying drawings, the present invention will be further described:

[0022] The drilling methane self-circulation explosion fracturing enhanced drainage method of the present invention, the specific steps are as follows:

[0023] a. First construct two gas drainage boreholes 1, one explosion fracturing borehole 2 and two guide boreholes 3 from the roadway to the coal seam, and then install the gas drainage pipe 1 4 and the gas drainage pipe 2 5 respectively Put into the gas drainage borehole, put the gas drainage pipe 3 23, the gas injection pipe 20 and the ignition device 21 into the explosion fracturing drilling, and finally seal the gas drainage drilling and the explosion fracturing drilling;

[0024] b. Connect gas extraction pipe 1 4, gas extraction pipe 2 5, and gas extraction pipe 3 23 to the suction port of gas extraction pump 7 through pipelines, and gas injection pipe 20 to exit gas booster pump 18 throu...

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Abstract

The invention provides a drilling methane self-circulation blasting fracturing enhanced extraction method which is suitable for efficient extraction of coal mine underground gas. The method comprises the steps that firstly, a gas extraction drill hole, a blasting fracturing drill hole and a guide hole are constructed in a coal seam; then a gas extraction pipe and a gas injection pipe are placed into the gas extraction drill hole and the blasting fracturing drill hole correspondingly and sealed; extracted gas is premixed into mixed gas with the concentration being 9% to 10% through an extraction pump, a filtering device and a gas mixing chamber, and the mixed gas is injected into the blasting fracturing drill hole through the gas injection pipe after passing through a gas storage tank and a booster pump; an ignition device is started to induce methane blasting fracturing, high-temperature and high-pressure shock waves generated by blasting are guided to crack the coal seam to generate a directional fracture network, meanwhile, methane desorption is promoted through the high temperature, and the methane concentration of the gas extraction hole and the methane concentration of the blasting fracturing hole are both greatly increased; and finally, gas extraction is synchronously conducted on the gas extraction hole and the blasting fracturing hole. According to the method, the coal seam is utilized for in-situ methane desorption blasting to construct the three-dimensional fracture network, and the methane extraction efficiency can be remarkably improved.

Description

technical field [0001] The invention relates to a drilling methane self-circulation explosion fracturing enhanced drainage method, which is especially suitable for high-efficiency gas drainage of hard coal seams with high gas and low permeability in underground coal mines. Background technique [0002] The air permeability of coal seams in my country is generally low, and the conventional drilling and drainage works are large but inefficient, so it is necessary to adopt effective fracturing and anti-permeability technology to improve the air permeability of coal seams. Conventional coal seam fracturing and anti-permeability technologies mainly include hydraulic technology and deep hole blasting technology. Hydraulic technology includes hydraulic fracturing, hydraulic punching and hydraulic slotting, etc., which consume a lot of water and fracturing fluid and have a single fracture shape; Therefore, it is necessary to develop a low-cost, time-saving, labor-saving and efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/116E21B43/26E21B47/00
CPCE21B43/006E21B43/116E21B43/26E21B47/00
Inventor 翟成孙勇郑仰峰徐吉钊刘厅罗宁余旭朱薪宇丛钰洲唐伟黄婷王宇
Owner CHINA UNIV OF MINING & TECH
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