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Method for progressive gas drainage in high gas medium-hard coal seam

A gas drainage, progressive technology, applied in gas discharge, earthwork drilling, safety devices, etc., to achieve the effect of improving safety and reliability, reducing air distribution, and eliminating hidden dangers of gas

Inactive Publication Date: 2010-12-15
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of regional gas drainage efficiency, the present invention provides a progressive gas drainage method for high-gas medium-hard coal seams

Method used

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  • Method for progressive gas drainage in high gas medium-hard coal seam
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  • Method for progressive gas drainage in high gas medium-hard coal seam

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Example 1, high-power drilling rig progressive module gas drainage,

[0016] like figure 1 As shown, when excavating the mining face 2 with multi-lane arrangement, the long boreholes are constructed in advance in the next adjacent mining face area 3 in the outer side groove 1 of the mining face 2, and the long holes are constructed every 5-10m Use domestic high-power drilling rigs to arrange construction long boreholes 6 to the adjacent mining face. The boreholes are basically arranged vertically to the roadway. The length is not less than 300m, and the drainage range covers the adjacent mining face and its trough. During the excavation of the current mining face 2, the excavation area of ​​the next mining face area 3 will be drained in advance to ensure that the next mining face 3 There is a drainage time of 1-3 years, and the roadway excavation of the next mining face area 3 is carried out in the position of the roadway strip 4 that has been drained for 1-3 years. Th...

Embodiment 2

[0017] Example 2, using a kilometer drilling rig for progressive gas drainage. like figure 2 indicated,

[0018] A progressive gas drainage method for high-gas medium-hard coal seams. When excavating a mining working face 2 arranged with multiple lanes, construction is carried out on the outer side of the mining working face 2 along the groove 1 to the next adjacent working face in advance. Long borehole 6, the length of the borehole is required to be able to penetrate at least the distance between the reserved roadway strips on both sides of the next two mining face areas, 500-600m, including two working faces. Drain the excavation area of ​​the next mining face area 3 to ensure that the next mining face area 3 has a drainage time of 1-3 years. The three-year roadway strip 4 has been carried out, and the gas has dropped to a controllable level, and the gas content in the mining face area 3 has also dropped to a safe level; Construct long-distance drilling in area 5 of the...

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Abstract

The invention relates to a coal seam gas drainage method, specifically to a method for progressive gas drainage in high gas medium-hard coal seam, which solves the problem of areal gas extraction efficiency. When stopes in multiple roadways are excavated, a long borehole, the length of which is required to be capable of at least running through the distance of reserved roadway strips at two sides of the next stope, is constructed in advance for a next adjacent stope area inside a column outside the stope, drainage in the mining area of the next stope area is performed in advance during excavation of this stope, in order to guarantee that the next adjacent stope area has sufficient drainage time, roadway excavation of the next stope area is performed at the drained strip position, the adjacent stope area is then mined, and simultaneously, the long borehole is constructed for the next adjacent stope area to continue gas drainage in such a progressive, circulative advancing manner. Thus normal alternation of drainage, excavation and mining is ensured.

Description

technical field [0001] The invention relates to a coal bed gas extraction method, in particular to a progressive gas extraction method for high-gas medium-hard coal seams. Background technique [0002] In high-gas mines, gas is the main factor that threatens mine safety. Only by solving the gas problem can the safe production of mines be guaranteed. "Pumping first and then mining" has become the consensus of coal mining enterprises. It is the most effective measure to control gas to carry out gas drainage treatment on the coal seam to be mined in advance, and only after the gas content of the coal body is reduced to a certain level through early drainage, can the gas concentration be effectively controlled during the coal mining process and improve the efficiency of coal mining. Efficiency, to prevent the occurrence of gas accidents. [0003] In the actual production process, gas drainage needs to choose different drainage technologies according to the geological conditions...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 张海军李国彪申晋伟刘毅胡包生
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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