地面钻井压裂区域瓦斯赋存影响规律及应用研究  

Study on Influence Law and Application of Gas Occurrence in Fracturing Area of Surface Drilling

作　　者：郝殿 李学臣 张清田 HAO Dian;LI Xuechen;ZHANG Qingtian(Institute of Science and Technology, Jiaozuo Cool Industry Group Co., Ltd., Jiaozuo 454002, Chin)

机构地区：[1]焦作煤业集团有限责任公司科学技术研究所,河南焦作454002

出　　处：《煤矿安全》2018年第4期121-123,127,共4页Safety in Coal Mines

摘　　要：针对九里山矿二1煤层瓦斯含量高,煤层透气性差,抽采衰减速度快的特点,为提高瓦斯抽采效果,实施了地面钻井水力压裂增透措施;为考察水力压裂影响范围内瓦斯赋存影响规律,在压裂影响区域内外开展相关考察。结果表明,在压裂影响范围内,煤层透气性增加,抽采效果大大提高,单组钻孔抽采纯流量提高1.65~2.36倍;压裂后煤体应力由压裂区向外运移,在压裂影响范围的边缘形成应力集中带,地应力及瓦斯压力增加,瓦斯压力梯度增大,初始钻孔流量增大。According to the characteristics of high gas content, poor permeability of coal seam and fast attenuation rate in Ⅱ1 coal seam of Jiulishan Mine, we implemented drilling hydraulic fracturing and permeability improvement measures. In order to investigate the influence law of gas occurrence in the affected area of hydraulic fracturing, the relevant investigation is carried out in and out of the affected area of fracturing. The results showed that the permeability of coal seam increased and the effect of extraction was greatly increased in the range of fracturing, and the pure flow rate of single drilling was increased by 1.65 to 2.36 times. After fracturing, the coal stress is moved from the fracturing zone to the outside, and the stress concentration zone is formed on the edge of the influence range of fracturing, the pressure of the ground and gas increases, the gas pressure gradient increases,and the initial borehole flow increases.

关 键 词：地面钻井 水力压裂 瓦斯赋存规律 抽采效果 应力集中 

分 类 号：TD713[矿业工程—矿井通风与安全]