A method for enhanced drainage of coal bodies caused by gas explosion fracturing in boreholes

A technology of gas explosion and gas extraction, which is applied in the field of efficient gas extraction and can solve the problems of personnel poisoning and death

Active Publication Date: 2016-03-30
CHINA UNIV OF MINING & TECH
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Problems solved by technology

In addition, a large amount of harmful gas is generated after the explosion, causing poisoning and death

Method used

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  • A method for enhanced drainage of coal bodies caused by gas explosion fracturing in boreholes

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Embodiment Construction

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

[0018] Such as figure 1 As shown, the method for intensified extraction of coal by gas explosion in a borehole of the present invention, the specific steps are as follows:

[0019] a. According to the conventional method, the positions of the drainage holes and the explosion holes are staggered 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 location of the explosion hole to 1m through the roof of the coal seam, and withdraw the drill;

[0022] d. Bind the wire of the ignition device 3 to 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 tied to the detection tube 6 is located in the middle of the coal seam; the detection tube 6 is evenly located on ...

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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 a method for intensified extraction of coal body caused by gas explosion in a borehole, and is particularly suitable for high-efficiency gas extraction of coal seams with high gas and low permeability in underground coal mines. Background technique [0002] The fundamental method of gas control in coal mines in our country is the gas drainage measures based on drilling gas drainage. As my country's coal mines enter deep mining, low coal seam permeability has gradually become the main controlling factor restricting efficient gas drainage. Therefore, enhanced penetration enhancement has become a key technology to improve the effect of gas drainage and realize the co-extraction of deep coal and gas. Blasting shock wave damage coal body enhanced extraction method is one of the effective measures proved in practice in recent years. It mainly relies on the installation of explosives inside the coal seam, and uses the shock wave generate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00
Inventor 林柏泉刘厅邹全乐汤宗清孔佳闫发志朱传杰姚昊
Owner CHINA UNIV OF MINING & TECH
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