低透气性煤层水力压裂增透技术应用 .pdfVIP

学兔兔 2012年第1期 煤 炭 工 程 低透气性煤层水力压裂增透技术应用 李全贵 ，翟 成 ，林柏泉 ，张萌博 ，李贤忠 ，倪冠华 (1．煤炭资源与安全开采国家重点实验室，徐州江苏 221116： 2．中国矿业大学安全工程学院，徐州江苏 221116) 摘 要：针对低透气性煤层瓦斯抽采效率低、钻孔施工量大等问题，提出了水力压裂增透技 术，研究了水力压裂增透机理。分析了水力压裂提高煤层透气性的过程，确定了设备仪器与压裂 X-艺参数，完成了高压钻孔密封与现场水力压裂，并对瓦斯抽果效果和煤层透气性系数变化进行 了考察。结果显示：实施水力压裂后，瓦斯抽采量提高了7．2倍，水力压裂影响区域内煤层透气 性系数提高了79～272倍，达到了增大煤层透气性，提高瓦斯抽采效率的目的。 关键词：低透气性煤层；水力压裂；瓦斯抽采；增透技术 中图分类号：TD713 ．3 文献标识码：B 文章编号：1671—0959(2012)01-0031 4 Application of Hydraulic Fracturing and Permeability Improvement Technology to Low Permeability Seam LI Quan—gui’一，ZHAI Cheng ，I,IN Bai—quart ，ZHANG Meng—bo ，Li Xian—zhong’一，NI Guan—hua t (1．National Key Lab ofCoal Resources and Safety Mining，Xuzhou 22l116，China； 2．School of Safety Engineering，China University of Mining and Technology，Xuzhou 221116，China) Abstract：According to the low gas drainage efficiency of the low permeability seam，high construction load of the boreholes and other problems，a hydraulic fracturing and perm eability improvement technology was provided． The hydraulic fracturing and penneability improvement mechanism was studied．The process of the hydraulic fracturing to improve the permeability of the seam was analyzed． The parartieters of the equipment instrument and fracturing were determined．The high pressure borehole sealing and the site hydraulic fracturing was completed．The investigation was conducted on the gas drainage effect and the seam permeability coefficient variation．The results showed that after the hydraulic fracturing completed，the gas drainage value was improved by 7．2 times and the permeability coefficients of the seam within the hydraulic