岳南煤业煤层水压致裂瓦斯抽采技术研究

Research on Coal Seam Hydraulic Fracturing Gas Extraction Technology in Yuenan Coal Industry

针对岳南煤业15#煤层渗透性差、瓦斯含量高、抽采效率低等问题,考虑采用水压致裂技术提高抽采率。首先通过地应力实测得出工作面最大主应力为水平应力,其值为17.9 MPa,方向角为N32.43°E,压裂裂纹扩展也沿此方向;压裂钻孔的影响范围为5~8,为保证抽采效果,将压裂抽采钻孔间距设置为5 m,压裂抽采4个月后,煤层瓦斯残存量降低至2.54 m~3/t,且抽采周期缩短了近3个月,保证了矿井的安全高效生产。

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.