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Cutting-exploding coupled coal anti-reflection method in drilled hole

An in-hole, coupled technology, applied in the fields of fluid extraction, earthwork drilling, gas discharge, etc., can solve the problem of limited effective influence range of a single slotted hole, and achieve the expansion of the effective pressure relief influence range. The method is simple, The effect of reducing the gas adsorption potential

Active Publication Date: 2015-05-13
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-reflection in coal mines, but the effective influence range of a single slotted drilling is still limited

Method used

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  • Cutting-exploding coupled coal anti-reflection method in drilled hole

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Embodiment Construction

[0019] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0020] The drilling internal cutting-explosion coupling type coal body anti-reflection method of the present invention, the specific steps are as follows:

[0021] a. Alternately arrange the hole positions of drainage boreholes and percussion boreholes in the coal seam to ensure that the drainage boreholes are all within the influence range of percussion boreholes;

[0022] b. Use ordinary drill bits to drill into the hole position of the drainage borehole until it completely penetrates the coal seam, and after sealing the hole, connect it to the gas drainage pipe network for gas drainage;

[0023] c. Use the integrated drilling and cutting drill bit to drill into the hole position of the percussion drilling to 1m past the roof of the coal seam, withdraw the drill, and perform hydraulic cutting on the coal seam in the drill hole;

[0024] d. After withdraw...

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Abstract

Provided is a cutting-exploding coupled coal anti-reflection method in a drilled hole. A large number of effective seam grooves are formed in a coal seam through a hydraulic cutting seam technology, and therefore effective decompression can be performed on coal within a certain range, and methane gas desorption seepage is promoted. Through a sucking pump, methane gas in the drilled hole is pumped into a closed explosive vessel arranged outside the drilled hole. High-pressure and high-temperature mixed methane gas with the concentration being 9.5% to 10.5% can be formed in the explosive vessel. The mixed gas is detonated through an igniting device, high-energy gas is formed, the drilled hole is impacted under guiding of a guiding pipe, and the coal further fractures on the basis of original seam grooves. Initial explosion temperature, initial pressure and igniting energy are reasonably selected according to the coal bed condition, optimal explosive capacity is formed in the explosive vessel, fracture network expansion is fully promoted, methane gas adsorption potential can be remarkably reduced, methane gas desorption is promoted, and the purpose of intensifying methane gas extraction is achieved. The method is simple, safe, reliable, low in cost and easy to operate, and time and labor are saved.

Description

technical field [0001] The invention relates to an internal cutting-explosion coupling type coal permeability increasing method, which 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 technology has become a key technology to improve the effect of gas drainage and realize the joint mining of deep coal and gas. Explosion 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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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00
CPCE21B43/26E21F7/00
Inventor 林柏泉洪溢都朱传杰姚昊邹全乐郭畅
Owner CHINA UNIV OF MINING & TECH
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