察哈素煤矿导向槽定向水力压裂增透技术研究  

Research on directional hydraulic fracturing technology with guiding channel for permeability increasing in Chahasu Coal Mine

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)

机构地区：[1]煤炭科学技术研究院有限公司,北京市朝阳区100013 [2]煤科通安〈北京〉智控科技有限公司,北京市朝阳区100013 [3]北京市煤矿安全工程技术研究中心,北京市朝阳区100013 [4]煤炭智能开采与岩层控制全国重点实验室,北京市朝阳区100013

出　　处：《中国煤炭》2024年第2期44-49,共6页China Coal

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.

关 键 词：定向水力压裂 瓦斯抽采 导向槽 抽采半径 数值模拟 

分 类 号：TD712.6[矿业工程—矿井通风与安全]