地面钻井压裂对井下瓦斯抽采的影响研究
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摘要
松软低透气性煤层瓦斯治理遇到了技术瓶颈,借助地面压裂对煤层增透的优势来改善井下瓦斯抽采效果是一种解决思路。为研究地面压裂对井下瓦斯抽采的影响,基于地面微震监测对压裂裂缝扩展影响范围进行预测,考察了压裂影响区内外的瓦斯含量、涌出量、煤层透气性、抽采效果、防突指标及掘进速度等参数。研究结果表明:裂缝扩展范围大致是以主裂缝为长轴的椭圆,地面压裂对井下抽采的影响具有时效性,井下抽采滞后地面压裂的时间越短,压裂对抽采的促进作用越明显。
Gas control in soft and low permeability coal seam has encountered technical bottlenecks. It is a solution to improve the effect of underground gas drainage by taking advantage of ground fracturing to enhance the permeability of coal seam.In order to explore the influence of ground fracturing on underground gas drainage,the influence range of fracture expansion was predicted based on ground microseismic monitoring,the parameters such as gas content,gas emission,permeability of coal seam,drainage effect,index of outburst prevention and tunneling speed were investigated. The results show that the range of fracture expansion is approximately ellipse with the main fracture as the long axis,and the effect of ground fracturing on underground drainage is timeliness,the shorter the lag time of underground drainage behind ground fracturing,the more obvious the promoting effect of fracturing on drainage.
Gas control in soft and low permeability coal seam has encountered technical bottlenecks. It is a solution to improve the effect of underground gas drainage by taking advantage of ground fracturing to enhance the permeability of coal seam.In order to explore the influence of ground fracturing on underground gas drainage,the influence range of fracture expansion was predicted based on ground microseismic monitoring,the parameters such as gas content,gas emission,permeability of coal seam,drainage effect,index of outburst prevention and tunneling speed were investigated. The results show that the range of fracture expansion is approximately ellipse with the main fracture as the long axis,and the effect of ground fracturing on underground drainage is timeliness,the shorter the lag time of underground drainage behind ground fracturing,the more obvious the promoting effect of fracturing on drainage.
引文
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[18]付军辉.煤矿地面水力压裂增透技术研究及应用[J].矿业安全与环保,2017,44(6):41-44.
[2]武华太.煤矿区瓦斯三区联动立体抽采技术的研究和实践[J].煤炭学报,2011,36(8):1312-1316.
[3]郭亮,付军辉,李日富.井上下联合抽采瓦斯技术在岳城矿的应用[J].矿业安全与环保,2013,40(2):59-61.
[4]王少卿.地面钻井压裂与井下水平钻孔联合瓦斯抽采研究[D].太原:太原理工大学,2015.
[5]常利铭.水力压裂技术在煤矿瓦斯治理方面的应用[J].矿业安全与环保,2015,42(2):96-99.
[6]王少卿,赵阳升,唐海波.地面钻井压裂煤层结合井下钻孔瓦斯抽放技术研究[J].煤炭技术,2014,33(12):216-218.
[7]陈金华,胡千庭.地面钻井抽采采动卸压瓦斯来源分析[J].煤炭科学技术,2009,37(12):38-42.
[8]张天军,宋爽,刘超,等.高河矿地面水力压裂裂缝监测及其识别方法[J].煤炭技术,2015,34(4):185-187.
[9]王保玉,白建平,郝春生,等.煤层气地面井压裂—井下长钻孔抽采技术效果分析[J].煤炭科学技术,2015,43(2):100-103.
[10]张欣.地面压裂治理瓦斯技术在屯兰矿区中的应用研究[J].神华科技,2017,15(8):23-25.
[11]张海军,袁德权,马钱钱.煤矿区地面钻井压裂井下效果考察[J].煤矿安全,2014(11):64-67.
[12]张军,孙东玲,黄旭超,等.地面钻井抽放采动区域瓦斯技术的试验研究[J].矿业安全与环保,2007,34(1):1-2.
[13]宋斌.煤层气抽采地面压裂与井下钻孔衔接时空关系研究[J].中州煤炭,2016(7):1-4.
[14]赵青云.地面井压裂抽采技术在新景矿突出煤层复杂构造带的应用试验[J].煤矿安全,2016(12):125-128.
[15]唐书恒,朱宝存,颜志丰.地应力对煤层气井水力压裂裂缝发育的影响[J].煤炭学报,2011,36(1):65-69.
[16]翁红波.煤层气井水力压裂效果评价与消突时间预测研究[D].焦作:河南理工大学,2015.
[17]高俊奇.地面压裂钻井提高煤层瓦斯抽采效果的研究[J].山西焦煤科技,2014(增刊1):43-45.
[18]付军辉.煤矿地面水力压裂增透技术研究及应用[J].矿业安全与环保,2017,44(6):41-44.