Hydraulic cutting and gas explosion combined enhancing extraction method for fracturing coal body in drill hole

A technology for hydraulic slitting and gas explosion, which is applied in the directions of gas discharge, earth-moving drilling, and fluid extraction, etc., can solve the problem of limited effective influence range of a single slit drilling hole, expand the effective pressure relief influence range, and reduce gas adsorption. Potential, the effect of promoting gas desorption and flow

Active Publication Date: 2015-01-28
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] At present, hydraulic slotting has been widely used in coal seam enhancement and anti-reflec

Method used

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  • Hydraulic cutting and gas explosion combined enhancing extraction method for fracturing coal body in drill hole

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Embodiment Construction

[0022] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0023] Such as figure 1 As shown, the specific steps of the method are as follows:

[0024] (1) In the coal seam, the hole positions of the drainage holes and the explosion holes are alternately arranged; wherein, the distance between the extraction holes and the centers of the explosion holes is 15-20m;

[0025] (2) Construction of drainage holes, sealing of holes, and connection to the gas drainage pipe network for gas drainage;

[0026] (3) Use a drilling rig to drill into the hole position of the explosion hole to 1m through the roof of the coal seam, and then withdraw the drill; use a high-pressure jet to cut the coal body around the explosion hole to form several slots;

[0027] (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 explosion hole, so that the front end of the wi...

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Abstract

The invention discloses a hydraulic cutting and gas explosion combined enhancing extraction method for fracturing a coal body in a drill hole. The hydraulic cutting and gas explosion combined enhancing extraction method is suitable for high-efficiency extraction of underground gas of a coal mine. The enhanced extraction method comprises the following steps: firstly, forming a slot by using a hydraulic cutting technology, relieving the pressure and increasing permeability, and desorbing and gushing gas; secondly, pressing air into a sealed drill hole by using an air pump, wherein the air and the gushed gas from the drill hole form gas mixed gas with the concentration of 9-10 percent; detonating the mixed gas by an ignition device to form an explosive shock wave; fracturing the coal body under the guiding action of the slot. The slot provides a greater explosion space, so that the power of explosion is enhanced and 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 safety, reliability, 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 80 percent.

Description

technical field [0001] The invention relates to a combined enhanced drainage method of hydraulic slits in boreholes and coal bodies caused by gas explosion fracturing, and is especially suitable for high-efficiency gas drainage of coal seams with high gas and low permeability underground in 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,...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B43/26
CPCE21B43/247E21B43/26E21F7/00
Inventor 林柏泉邹全乐刘厅闫发志洪溢都朱传杰陈健任宏伟孔佳
Owner CHINA UNIV OF MINING & TECH
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