Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method

A gas drainage and gas permeability technology, which is used in gas drainage, earthwork drilling, safety devices, etc., can solve the problems of ineffective gas drainage and inability to form gas, eliminate the danger of coal and gas outburst, reduce Destructive effect, the effect of safe and efficient recovery
CN1534164AActive Publication Date: 2004-10-06HUAINAN MINING IND GRP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUAINAN MINING IND GRP
Publication Date
2004-10-06

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Abstract

A remotely pressure-releasing method for sucking and exhausting gas from the low-air-permeability high-gas soft and thick coal seam is disclosed. The coal seam, which is 70m under the coal seam to be gas-exhausted and has relative interbeam distance of 30-70 times, is first mined. Under the action of pressure release and subsidence, the cracks are generated in the coal seam and the gas penetrates through the cracks and then is exhausted via predrilled holes. After the coal seam is mined, a great deal of gas is flowing along the seam and then is sucked by said predrilled holes.
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Description

Technical field:

[0001] The invention relates to a coal mine safety production method. More specifically, it is a coal seam gas pre-extraction method. Background technique:

[0002] Anhui Huainan Mining Area is located in the hinterland of East China and is an important energy base in my country. The mining area is rich in coal resources, with a large number of mineable coal seams, and the pressure-relieving coal seams are stable and thick. The average thickness of the 13# coal seam in the main mining area of ​​the Huainan mining area is 6m, the original gas pressure of the coal seam is 4.4MPa, and the gas content is 13m 3 / t, coal seam permeability coefficient is 0.01135m 2 / (MPa 2 .d) is a typical low-permeability and high-gas soft thick outburst dangerous coal seam. During the mining process of this coal seam, coal and gas outburst accidents and large gas explosion accidents that caused many deaths occurred many times. Facing to the gas emission 25m 3 / d, the gas c...

Claims

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