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

Active Publication Date: 2004-10-06
HUAINAN MINING IND GRP +1
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  • Application Information

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Problems solved by technology

Among them, the roof high roadway method is to arrange the drainage roadway in the crack zone of the roof, and the pressure relief gas gathers to the drainage roadway along the flow channel formed by the vertical fracture crack. This method has a good effect on the coal seam in the crack zone. However, for the pressure relief coal seam in the curved subsidence zone, since there is no vertical fracture gap, it is impossible to form the flow conditions for the gas to gather along the interlayer to

Method used

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

Examples

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Example Embodiment

[0013] Aiming at the Huainan mining area, firstly mine the 11# mining seam 1 which is located at a distance of 70m from the 13# relief coal seam 2 and the relative interlayer spacing is 30 to 40 times. Under the effects of mining pressure relief and subsidence, pressure relief cracks along the bedding cracks are formed in 13# pressure relief coal seam 2. In advance, the pressure relief coal seam 2 floor gas drainage lane 4 is used to make an upward mesh pattern to the pressure relief coal seam 2. Drain the borehole 3 through the strata, and the pressure-relief gas is collected along the stretched cracks along the layer to the drainage borehole 3, and is drained through the drainage pipeline.

[0014] Specific implementation:

[0015] 1. On the reasonable location of the floor gas drainage roadway.

[0016] According to the theory of rock pressure, after the 11# mining coal seam 1 is mined, the overlying rock layer will form the caving zone 7, the fracture zone 6 and the bending su...

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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.

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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Application Information

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IPC IPC(8): E21F7/00
Inventor 袁亮俞启香李平程远平刘永庆廖斌琛金学玉童云飞叶发先蒋承林
Owner HUAINAN MINING IND GRP
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