Exploration of Key Technologies for Gas Extraction from Low Permeability Coal Seams in Mines
In response to the problems of poor permeability,high mineral impurities,high internal stress,high gas content,low gas extraction concentration,and difficulty in gas extraction in the No.3 coal seam of a certain mine in Shanxi,based on the situation of the No.3 coal seam and the overview of the experimental working face,a strategy combining hydraulic fracturing and coal seam acidification is proposed to improve the gas extraction concentration.The experimental results show that after applying this strategy,the impurities in the coal seam decrease and the permeability of the coal seam significantly improves.Compared with the areas where this measure was not taken,the gas extraction concentration increased by 2.5～3 times,and the overall pure gas extraction volume increased by 1.5～3 times.The efficiency of coal seam gas extraction was significantly improved,which can provide reference for efficient coal seam gas extraction under similar working conditions.
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