摘要
针对察哈素煤矿煤层透气性低、瓦斯抽采难度大的问题,提出应用预置导向槽的定向水力压裂技术提高煤层抽采效率的技术方法。利用COMSOL Mutiphysics模拟软件建立煤岩应力损伤渗透的水力压裂抽采耦合模型,分析导向槽作用下煤层弹性损伤模量的变化以及有效抽采半径,并在24130工作面进行了现场试验。数值模拟和现场试验效果表明,导向槽作用煤层所受的水平主压力大于垂直方向的主应力,率先在水平方向上发生岩层拉伸破裂,现场定向水力压裂作业后抽采钻孔的平均瓦斯浓度为42.4%,平均瓦斯纯量为0.0098 m^(3)/min,有效抽采半径为3.6 m,与数值模拟结果大致吻合。
In view of the low permeability of coal seam and the difficulty of gas drainage in Chahasu Coal Mine,directional hydraulic fracturing technology with preset guiding channel was proposed to improve the efficiency of coal seam gas drainage.The hydraulic fracturing gas drainage coupling model of coal rock stress-damage-permeability was established by COMSOL Mutiphysics simulation software,the changes of elastic damage modulus and effective gas drainage radius of coal seam under the action of guiding channel were analyzed,and field tests were carried out at 24130 working face.The numerical simulation and field test results show that the horizontal principal pressure of coal seam under the action of guiding channel is greater than the vertical principal stress,showing the rock strata tensile fracture first in the horizontal direction.The average gas concentration of the drainage borehole after the field directional hydraulic fracturing operation is 42.4%,the average gas pure content is 0.0098 m 3/min,and the effective extraction radius is 3.6 m,which are roughly consistent with the numerical simulation results.
作者
魏远
赵尤信
WEI Yuan;ZHAO Youxin(CCTEG China Coal Research Institute,Chaoyang,Beijing 100013,China;Meike Tongan Beijing Intelligent Control Technology Co.,Ltd.,Chaoyang,Beijing 100013,China;Beijing Coal Mine Safety Engineering Technology Research Center,Chaoyang,Beijing 100013,China;State Key Laboratory of Coal Intelligent Mining and Strata Control,Chaoyang,Beijing 100013,China)
出处
《中国煤炭》
北大核心
2024年第2期44-49,共6页
China Coal
关键词
定向水力压裂
瓦斯抽采
导向槽
抽采半径
数值模拟
directional hydraulic fracturing
gas drainage
guiding channel
drainage radius
numerical simulation
作者简介
魏远(1988-),男,河南兰考人,硕士,助理研究员,从事煤矿瓦斯防治和矿井通风技术研究。E-mail:weiyuansafety@163.com。
