Research on Coal Seam Hydraulic Fracturing Gas Extraction Technology in Yuenan Coal Industry
In response to the problems of poor permeability,high gas content,and low extraction efficiency in the 15th coal seam of Yuenan Coal Industry,hydraulic fracturing technology is considered to improve the extraction rate.Firstly,the maximum principal stress of the working face was determined to be horizontal stress through in-situ stress measurement,with a value of 17.9 MPa and a directional angle of N32.43 °E.The fracturing crack propagation also followed this direction.The impact range of fracturing drilling is 5～8.In order to ensure the pumping effect,the spacing between fracturing and pumping drilling holes is set to 5 meters.After 4 months of fracturing and pumping,the residual amount of coal seam gas is reduced to 2.54 m3/t,and the pumping cycle is shortened by nearly 3 months,ensuring the safe and efficient production of the mine.
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