摘要
本文针对低渗透煤层抽采效果差、钻孔工程量大及抽采周期长的难题,提出了水力压裂卸压增透技术。通过RFPA2D-Flow模拟研究了压裂过程中压裂孔附近煤体的裂隙裂纹演化规律,在斜沟煤矿18205材料巷实施水力压裂现场试验结果与模拟结果基本一致;压裂区域内钻孔瓦斯抽采浓度增大4.43倍,抽采纯量提高9.62倍,煤层的透气性系数增大14倍,抽采效果得到明显改善。
Aiming at the problems of poor extraction effect, large borehole volume and long extraction period in low permeability coal seam, Hydraulic fracturing and pressure relief technology was put forward. Through RFPA2D-Flow simulation, the evolution law of cracks in coal seams near fracturing holes during fracturing process was studied. The field test results of hydraulic fracturing in material roadway 18205 of Xiegou Coal Mine were basically consistent with the simulation results. The gas extraction concentration of boreholes in fracturing area increased by 4.43 times, the extraction purity increased by 9.62 times, the permeability coefficient of coal seam increased by 14 times, and the extraction effect was improved obviously.
作者
边小峰
毕建乙
张辉
Bian Xiaofeng;Bi Jianyi;Zhang Hui(Xiegou Coal Mine of Shanxi Xishan Jin Xing Energy Co., Ltd., Luliang Shanxi 033602 , China;Shenyang Research Institute ,China Coal Technology Group,Fushun Liaoning,113122,China)
出处
《同煤科技》
2019年第3期18-20,23,共4页
Datong Coal Science & Technology
基金
国家自然科学基金资助项目(51404126)
国家重大科技产业工程计划(2016ZX05067004-003)
关键词
水力压裂
卸压增透
剪应力
有效影响半径
Hydraulic fracturing
Pressure relief
shear stress
Effective influencing radius
