Coal seam pre-splitting method based on gas extraction

A technology for gas drainage and coal seam, applied in the field of gas drainage, can solve the problems of not being widely promoted, high drainage cost, difficult drilling, etc., so as to solve major safety hazards, reduce drainage system, and widen drainage. The effect of using

Active Publication Date: 2010-08-25
山西锦浩诚科技有限公司
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Problems solved by technology

But as far as we know, the suitable explosives used in the pre-splitting blasting of deep hole explosives have not been well resolved. Although the country has invested heavily in it and included it in the plan for research, so far no results have been produced.
[0006] 2. Open flames are generated during explosive blasting, which may ignite or cause explosion of high-concentration gas, which increases safety risks when used in high-gas coal seams
However, due to the poor permeability of water in the coal body, it cannot reach the tiny cracks in the coal body at all, and can only have an effect on a few relatively large cracks. Little effect on radical improvement
In particular, the stagnant water in the coal body will have a sealing effect on its capillary micro-pores, whi

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  • Coal seam pre-splitting method based on gas extraction
  • Coal seam pre-splitting method based on gas extraction
  • Coal seam pre-splitting method based on gas extraction

Examples

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Example Embodiment

[0051] Example 1

[0052] Dongzhuang Coal Mine in Wuxiang County is a high gas mine and one of the most difficult mines in Changzhi City. The No. 3 coal seam is the main coking coal. The coal seam has high gas content, extremely poor gas permeability, and strong gas adhesion. The coal that has been piled out of the well for several months can still detect gas after it is broken.

[0053] The mine has arranged 30101 working face in its No. 3 coal seam. Due to the high gas content in the coal seam, it cannot meet the coal mining standards. The Gas Research Institute of Fushun Coal Research Institute designed and installed an underground gas drainage system for gas pre-drainage. put. In the two troughs of the working face, an average of a drainage hole is drilled every 5 meters. The hole diameters are 75, 90, and 110 mm. The hole depth is 30 to 70 meters, and the average is about 50 meters. The pumping began in November 2007. The initial gas concentration was about 20%. After 20 day...

Example Embodiment

[0069] Example 2

[0070] The Xinyuan Coal Mine of Changzhi Qinxin Coal and Coke Company mainly uses coking coal, with an average thickness of 1.7 meters and a gas content of 3.18-9.86 cubic meters per ton, with an average of 6.96 cubic meters. The coal seam firmness coefficient is 0.305, the air permeability system is 0.474~0.961, and the gas flow attenuation coefficient of the 100-meter borehole is 0.0927~0.2453, which is a difficult-to-drain coal seam.

[0071] The underground drainage system of the mine was designed by Yangquan Coal Industry Group. According to the original records of coal seam extraction, the gas extraction concentration was about 13% on the first day of drainage, about 7% on the second day, and about 7% on the third day. The concentration is only about 2%, and there will be no recovery in the future.

[0072] On December 28, 2009, a test aimed at pre-splitting the radius of action was carried out in the 1219 working face (spare working face) 20 of the mine. Th...

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Abstract

The invention relates to a coal seam pre-splitting method based on gas extraction, which adopts a 'CO2 gas extraction device' as a tool to blast and pre-split a pre-mined coal seam, so as to increase the crack of the coal seam, drive out gas absorbed on the coal seam and extract the gas. The method particularly comprises the following steps: drilling a hole on the working surface of a pre-mined coal seam, filling CO2 gas extraction device into the drilled hole, sealing the drilled hole, detonating the CO2 gas extraction device, releasing high-pressure CO2 gas for deep-hole impact and pre-splitting of the coal seam, taking out the CO2 gas extraction device, and connecting the drilled hole with a gas extraction system to extract gas. The pre-splitting method of the invention can greatly enhance the permeability of the coal seam, promote the gas dissociation in the coal seam, and improve the underground gas extraction efficiency of the coal mine.

Description

technical field [0001] The invention belongs to the technical field of gas drainage, and relates to a method for pre-cracking coal seams before gas drainage. Background technique [0002] With the increase of coal mining depth, the amount of gas emission also increases, and the number of high-gas mines increases, especially in coal mines with poor coal seam permeability and strong gas adsorption, which makes it difficult to carry out gas extraction, and it is difficult to achieve the national gas control "16 The core standard of "draining up to standard" in the "Word Policy" poses a huge threat to the safe production of coal in my country and seriously restricts the sustainable development of the coal industry. [0003] Strengthening coal seam fissures, improving coal seam gas permeability, and then enhancing the freeness of gas in coal seams is a method to solve the "drainage difficulty" in theory. In fact, my country's current solution to the "difficult problem" of gas ext...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 张海成张稳
Owner 山西锦浩诚科技有限公司
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