In-borehole gas explosion coal body cracking forced extraction method

A gas explosion and gas extraction technology, which is applied in the field of efficient gas extraction and can solve problems such as people's poisoning and death

Active Publication Date: 2014-12-24
CHINA UNIV OF MINING & TECH
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Problems solved by technology

In addition, a large amount of harmful gas is genera

Method used

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  • In-borehole gas explosion coal body cracking forced extraction method

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Embodiment Construction

[0017] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0018] Such as figure 1 As shown, the gas explosion fracturing coal body enhanced drainage method in the borehole of the present invention, the specific steps are as follows:

[0019] a. According to the conventional method, the hole positions of the drainage hole and the explosion hole are arranged alternately in the coal seam;

[0020] b. Construct drainage holes, seal holes, and connect them to the gas drainage pipe network for gas drainage;

[0021] c. Use a drilling rig to drill at the hole position of the explosion hole to a point 1m through the roof of the coal seam, and then withdraw the drill;

[0022] d. Bind the wire of the ignition device 3 on the detection tube 6, and then send the detection tube 6 into the bottom of the explosion hole, so that the front end of the wire bound on the detection tube 6 is located in the middle of the coal seam; ...

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Abstract

The invention discloses an in-borehole gas explosion coal body cracking forced extraction method, and is applied to the efficient extraction of underground gas of a coal mine. An air pump is used for pressing air into a sealed borehole, the air and gas gushed from the borehole are premixed to form mixed gas at concentration of 9 to 10 percent, and the mixed gas is detonated by virtue of an ignition device to form explosion waves to crack a coal body to construct a fracture network; meanwhile, by thermal effects achieved by explosion, the adsorption potential of the gas can be remarkably lowered, and the desorption and the flowing of the gas can be promoted, so that the aim of forced gas extraction of a high-gas low-air-permeability coal seam is fulfilled. The method is low in cost, simple, easy, time-saving and labor-saving; the effective pressure relief influence scope of a single hole can be remarkably widened, and the gas extraction efficiency of the coal seam can be improved by over 40 percent.

Description

technical field [0001] The invention relates to an enhanced gas extraction method for gas explosion-induced fracturing of a coal body in a borehole, and is especially suitable for high-efficiency gas extraction of high-gas and low-permeability coal seams in underground coal mines. Background technique [0002] The fundamental means of underground gas control in my country's coal mines is gas drainage measures based on borehole gas drainage. As my country's coal mines enter deep mining, the low permeability of coal seams has gradually become the main controlling factor restricting the efficient extraction of gas. Therefore, enhanced anti-reflection has become a key technology to improve the effect of gas drainage and realize the co-mining of deep coal and gas. Blasting shock wave damaged coal body enhanced drainage method is one of the effective measures proved by practice in recent years. It mainly relies on installing explosives inside the coal seam, and uses the shock wa...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 林柏泉邹全乐陈健刘厅闫发志朱传杰任宏伟洪溢都孔佳
Owner CHINA UNIV OF MINING & TECH
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