A method for pre-pumping and preventing outburst of strong outburst coal seam

A technology of strong outburst coal seam and pre-extraction is applied in the field of strong outburst coal seam pre-extraction and prevention of outburst, preventing gas outburst accidents in deep coal seams with strong gas outburst, and can solve problems such as gas outburst in holes, gas over-limit accidents, construction difficulties, etc. Achieve the effect of reducing gas content and pressure

Active Publication Date: 2016-09-28
HUAINAN MINING IND GRP +2
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Problems solved by technology

This method has the problems of large drilling engineering, difficult construction, high cost investment, long extraction time, affecting normal production planning, and the possibility of gas outburst and gas overrun accidents in the hole during the drilling process

Method used

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  • A method for pre-pumping and preventing outburst of strong outburst coal seam
  • A method for pre-pumping and preventing outburst of strong outburst coal seam
  • A method for pre-pumping and preventing outburst of strong outburst coal seam

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Embodiment Construction

[0018] A method for pre-extraction and anti-outburst of strong outburst coal seams. After exploration in the coal mine area, there is a high-gas coal seam mining area that has been determined. First, within the edge of the mining area, drill down along the direction of the roadway to be excavated within a range of no more than 15 meters from the ground. Two shafts, respectively the first shaft and the second shaft, the diameter of the two shafts after cementing is between 150mm and 200mm, the bottom of the two shafts extends into the coal seam at least 10 meters, from 1 meter away from the coal seam to the wellhead The side wall is cemented with cement; the coal seam hole is mechanically reamed to at least 4 times the diameter of the vertical shaft, and then a reaming high-pressure water jet drill bit is inserted into the coal seam at the bottom of the well, and the high-pressure water jet reaming process is used to continue to expand the two holes. The coal seam holes under th...

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Abstract

The invention discloses a pre-drainage outburst prevention method of a strong outburst coal seam. A definite high gas coal seam mine area exists. The method comprises the following steps: firstly drilling two shafts in the inner edge of the mine area along the trend of a roadway to be excavated and cementing by using cement from a part which is one meter away from the coal seam to the side wall of a wellhead; reaming the coal seam by using a high-pressure water injection reaming process; then performing fracture gas gap penetration between two reamed coal seam holes by using an aerodynamic cavity forming process; drilling a third shaft in the mine area within a range which is at least 60 meters away from the two shafts, communicating with the first and second shafts by using a transverse drilling mode respectively after the third shaft enters the coal seam, sealing the wellhead of the third shaft, and draining gas from the first and second shafts until the gas concentration is less than a standard value. According to the method, a passage from the ground to an underground roadway coal uncovering area is established by using the two shafts and the multi-branch horizontal well in the ground, so that more coal can be taken out, more gas can be drained, and the gas content and pressure in a target coal seam are greatly reduced to achieve the outburst prevention purpose.

Description

technical field [0001] The invention relates to the field of coal mine safety, in particular to a method for pre-pumping and preventing outburst of strong outburst coal seams, and is a method for preventing gas outburst accidents in which deep gas outbursts strongly out of coal seams. Background technique [0002] At present, mines that have safety risks for underground stone gates or coal mines in roadways, such as coal mines that are being mined, detect a high gas area at a certain distance from the mining roadway. In order to eliminate the high pressure and high gas in the mining area to be mined, now The method of gas pre-extraction in downhole drilling is generally adopted. This method has the problems of large drilling engineering, difficult construction, high cost investment, long extraction time, affecting normal production planning, and the possibility of gas outburst and gas overrun accidents in the hole during the drilling process. Especially for mines that are d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00
CPCE21F7/00
Inventor 李平张群阴慧胜焦先军王成杨涛李点尚杜志强张才汪敏华王正喜杜博野白国基徐建军朱泽斌丁祥发丁同福赵龙韩必武单元伟张臻豪程斌
Owner HUAINAN MINING IND GRP
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