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Enhanced extraction method for fracturing coal body by multistage gas explosion in drill hole

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: 2015-01-28
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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  • Enhanced extraction method for fracturing coal body by multistage gas explosion in drill hole

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Embodiment Construction

[0021] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0022] Such as figure 1 As shown, the multi-stage gas explosion fracturing coal body enhanced drainage method in the borehole of the present invention, the specific steps are as follows:

[0023] (1) Firstly, the hole positions of the extraction hole and the explosion hole are alternately arranged in the coal seam according to the conventional method; wherein, the distance between the extraction hole and the center of the explosion hole is 10-15m;

[0024] (2) Construction of drainage holes, sealing of holes, and connection to the gas drainage pipe network for gas drainage;

[0025] (3) Use a drilling rig to drill through the coal seam roof 1m at the hole position of the explosion hole, and then withdraw the drill;

[0026] (4) 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 expl...

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Abstract

The invention discloses an enhanced extraction method for fracturing a coal body by multistage gas explosion in a drill hole. The enhanced extraction method is suitable for high-efficiency extraction of underground gas of a coal mine. Air is pressed in a sealed drill hole by using an air pump; the air and gas gushed from the drill hole form gas mixed gas with the concentration of 9-10 percent; the mixed gas is detonated by an ignition device to form an explosive shock wave for fracturing the coal body around the drill hole; the later-stage explosion is realized on the basis of the previous-stage explosion, so that cracks of the coal body around the drill hole are further expanded; besides, the shock wave compress the coal body to form a greater explosion space, and the power of explosion is enhanced. By multistage explosion, a fracture network in the coal body can be fully constructed; besides, the adsorption potential of gas can be remarkably reduced and the desorption and the flowing of the gas are promoted by the heat effect generated by explosion, so that the aim of enhancing the gas extraction of a coal bed with high-concentration gas and low permeability is achieved. The enhanced extraction method has the advantages of low cost, simplicity, feasibility, time conservation and force conservation; the influence range of effective pressure relief of single holes can be remarkably widened, and the extraction rate of the gas in the coal bed is increased by over 60 percent.

Description

technical field [0001] The invention relates to a multi-stage gas explosion-induced fracturing coal body enhanced drainage method in a borehole, and is especially suitable for efficient gas drainage 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, enhancing the permeability of coal 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 wave...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B43/26
CPCE21B43/26E21F7/00
Inventor 林柏泉邹全乐刘厅陈健洪溢都闫发志朱传杰任宏伟孔佳
Owner CHINA UNIV OF MINING & TECH
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