综合水力化增透措施在豫西“三软”煤层的工程应用探讨
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摘要
针对豫西"三软"煤层水力冲孔增透后瓦斯抽放浓度及流量衰减快的问题,采用水力压裂、水力扩孔综合增透措施,通过瓦斯涌出量、作用半径、抽采量对比,研究了综合水力化措施的应用效果。结果表明,综合水力化措施能有效解决防突、增加煤层透气性及煤层瓦斯涌出量,水力压裂半径达到20.0～25.0m,水力扩孔影响半径达到6m以上;水力扩孔后钻孔抽采浓度较普通钻孔增加4～7倍,流量衰减延长3～5倍。
In view of the problem that the gas drainage concentration and flow rate decayed rapidly after the hydraulic punching permeability-improvement in soft coal seam with soft roof and floor in western Henan province,comprehensive permeabilityimprovement measures of hydraulic fracturing and hydraulic reaming were adopted,and through comparing gas emission amount,influence radius and gas drainage amount,the application effects of comprehensive hydraulic measures were studied.The results showed that the comprehensive hydraulic measures could effectively solve the anti-burst,increase the coal seam permeability and gas emission amount.The hydraulic fracturing radius reached 20.0～25.0 m,and the influence radius of hydraulic reaming reached over 6 m;after hydraulic reaming,the drilling gas drainage concentration was 4～7 times higher than that of ordinary drilling,and the gas flow attenuation time was 3～5 times longer.
In view of the problem that the gas drainage concentration and flow rate decayed rapidly after the hydraulic punching permeability-improvement in soft coal seam with soft roof and floor in western Henan province,comprehensive permeabilityimprovement measures of hydraulic fracturing and hydraulic reaming were adopted,and through comparing gas emission amount,influence radius and gas drainage amount,the application effects of comprehensive hydraulic measures were studied.The results showed that the comprehensive hydraulic measures could effectively solve the anti-burst,increase the coal seam permeability and gas emission amount.The hydraulic fracturing radius reached 20.0～25.0 m,and the influence radius of hydraulic reaming reached over 6 m;after hydraulic reaming,the drilling gas drainage concentration was 4～7 times higher than that of ordinary drilling,and the gas flow attenuation time was 3～5 times longer.
引文
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[2]林柏泉,何学秋.煤体透气性及其对煤与瓦斯突出的影响[J].煤炭科学技术,1991(4)
[3]孙月庚.改变煤层透气性防突措施及应用[J].煤矿安全,2005(9)
[4]王兆丰.水力冲孔技术在松软低透突出煤层中的应用[J].煤炭科学技术,2012(2)
[5]袁亮,林柏泉,杨威等.我国煤矿水力化技术瓦斯治理研究进展及发展方向[J].煤炭科学技术,2015(1)
[6]彭业升,宋大钊,何志龙等.三软煤层水力冲孔布孔参数确定及优化[J].中国煤炭,2016(3)
[7]乌效鸣,屠厚泽.煤层水力压裂典型裂缝形态分析与基本尺寸确定[J].中国地质大学学报,1995(1)
[8]王凯.水力冲孔钻孔周围煤层透气性变化规律[J].采矿与安全工程学报,2013(9)
[9]董钢锋,林府进.高压水射流扩孔提高穿层钻孔预抽效果的试验[J].矿业安全与环保,2001(3)
[10]张永将,孟贤正.高压水射流水力扩孔抽采半径考察研究[J].矿业安全与环保,2012(S1)
[11]李鹏,王凯,蒋一峰等.红岭煤矿本煤层水力扩孔技术应用研究[J].煤炭科学技术,2015(7)
[12]李朝.潘三矿1792(3)运顺回风联巷水力扩孔消突技术研究[J].煤炭技术,2011(5)
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[14]李艳增,王耀锋,高中宁等.水力割缝(压裂)综合增透技术在丁集煤矿的应用[J].煤矿安全,2011(9)
[15]李宗福,孙大发,陈久福等.水力压裂-水力割缝联合增透技术应用[J].煤炭科学技术,2015(10)
[16]刘威,张敬军,亢方超等.考虑煤体蠕变位移的水力扩孔合理扩煤量[J].中国安全科学学报,2017(3)
[17]葛兆龙,梅绪东,贾亚杰等.高压水射流割缝钻孔抽采影响半径研究[J].采矿与安全工程学报,2014(4)