井下重复水力压裂技术在保安煤矿的应用
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摘要
为了更好地提高煤储层的渗透率,减少水力压裂盲区,提出了井下重复水力压裂增透技术,并阐述了井下水力压裂的一般工艺流程。根据保安煤矿地质及煤层特征,设计了该矿重复水力压裂的关键技术参数,并进行了重复水力压裂试验和压裂效果检验。结果表明:未压裂区域单孔瓦斯抽采纯量和抽采浓度平均为0.0024m3/min和6.2%,压裂区域平均为0.0051m3/min和11.2%,分别提升1.13倍和0.81倍,瓦斯抽采效果提升显著;未压裂煤体透气性系数为0.007861m2/(MPa2·d),压裂后为0.317582m2/(MPa2·d),提高40倍以上;水力压裂后百米流量衰减系数由原始煤体百米流量衰减系数0.024减小到0.021,降低了12.5%。试验结果表明重复水力压裂能够有效提高井下瓦斯抽采效果,在煤矿瓦斯灾害防治中具有推广应用价值。
In order to improve the permeability of coal reservoir and reduce the blind zone of hydraulic fracturing,this paper puts forward the technology of underground mine repeated hydraulic fracturing to enhance permeability,and expounds the general process flow of underground mine hydraulic fracturing.According to the characteristics of geology and coal seam in Baoan coal mine,the key technical parameters of repeated hydraulic fracturing are designed,and repeated hydraulic fracturing test and fracturing effect test are carried out.The results show that the recovery of pure quantity and extraction concentration averaged0.0024 m3/min and 6.2% pumping without fracturing area of single hole gas fracturing,the regional average was 0.0051 m3/min and 11.2%,up to 1.125 times and 0.81 times respectively,significantly enhance the recovery effect of gas drainage;without fracturing coal permeability coefficient is 0.007861 m2/(MPa2·d),after fracturing 0.317582 m2/(MPa2·d),increases more than 40 times;hydraulic fracturing after 100 meters flow attenuation coefficient from the original coal flow attenuation coefficient of 0.024 meters reduced to0.021,reduces by 12.5%.The test results show that the repeated hydraulic fracturing can effectively improve the underground gas drainage effect,and have the popularization and application value in the coal mine gas disaster prevention and control.
In order to improve the permeability of coal reservoir and reduce the blind zone of hydraulic fracturing,this paper puts forward the technology of underground mine repeated hydraulic fracturing to enhance permeability,and expounds the general process flow of underground mine hydraulic fracturing.According to the characteristics of geology and coal seam in Baoan coal mine,the key technical parameters of repeated hydraulic fracturing are designed,and repeated hydraulic fracturing test and fracturing effect test are carried out.The results show that the recovery of pure quantity and extraction concentration averaged0.0024 m3/min and 6.2% pumping without fracturing area of single hole gas fracturing,the regional average was 0.0051 m3/min and 11.2%,up to 1.125 times and 0.81 times respectively,significantly enhance the recovery effect of gas drainage;without fracturing coal permeability coefficient is 0.007861 m2/(MPa2·d),after fracturing 0.317582 m2/(MPa2·d),increases more than 40 times;hydraulic fracturing after 100 meters flow attenuation coefficient from the original coal flow attenuation coefficient of 0.024 meters reduced to0.021,reduces by 12.5%.The test results show that the repeated hydraulic fracturing can effectively improve the underground gas drainage effect,and have the popularization and application value in the coal mine gas disaster prevention and control.
引文
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[7]王佰顺,戴广龙,童云飞,等.深孔松动爆破提高瓦斯抽放率的应用研究[J].煤矿安全,2002,33(11):5-7.
[8]龚敏,张凤舞,文斌,等.煤巷底板岩石爆破提高瓦斯抽放率的应用与数值模拟[J].煤炭学报,2012,37(6):972-977.
[9]石亮,殷卫锋,王滨,等.基于CO2爆破致裂增透的瓦斯治理技术与实践[J].煤炭科学技术,2015,43(12):72-74.
[10]陈永民,王苏健,宋超,等.松软低透煤层CO2爆破增透技术应用研究[J].煤矿开采,2015,20(3):133-135.
[2]刘晓,张双斌,郭红玉.煤矿井下长钻孔水力压裂技术研究[J].煤炭科学技术,2014,42(3):42-44.
[3]李全贵,翟成,林柏泉.低透气性煤层水力压裂增透技术应用[J].煤炭工程,2012(1):31-33,36.
[4]林柏泉,孟凡伟,张海宾.基于区域瓦斯治理的钻割抽一体化技术及应用[J].煤炭学报,2011,36(1):75-79.
[5]宋维源,王忠峰,唐巨鹏.水力割缝增透抽采煤层瓦斯原理及应用[J].中国安全科学学报,2011,21(4):78-82.
[6]王念红,陈祖国.穿层水力冲孔增透技术在严重突出煤层中的应用[J].煤炭科学技术,2011,39(5):61-63.
[7]王佰顺,戴广龙,童云飞,等.深孔松动爆破提高瓦斯抽放率的应用研究[J].煤矿安全,2002,33(11):5-7.
[8]龚敏,张凤舞,文斌,等.煤巷底板岩石爆破提高瓦斯抽放率的应用与数值模拟[J].煤炭学报,2012,37(6):972-977.
[9]石亮,殷卫锋,王滨,等.基于CO2爆破致裂增透的瓦斯治理技术与实践[J].煤炭科学技术,2015,43(12):72-74.
[10]陈永民,王苏健,宋超,等.松软低透煤层CO2爆破增透技术应用研究[J].煤矿开采,2015,20(3):133-135.