基于压裂扁球体的端头悬顶双向拉链式水力压裂控制技术  

Bidirectional Zipper Hydraulic Fracturing Control Technology Based on Fracturing Flat Sphere with End Hanging Roof

作　　者：钟杰[1] 刘江伟 刘耀友 于骞 ZHONG Jie;LIU Jiangwei;LIU Yaoyou;YU Qian(Production Technology Department,Wanbei Coal-Electricity,Suzhou 234000,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]皖北煤电集团生产技术部,安徽宿州234000 [2]山东科技大学能源与矿业工程学院,山东青岛266590

出　　处：《煤炭技术》2024年第11期110-114,共5页Coal Technology

摘　　要：采煤面端头三角区悬顶垮落不及时,易出现周期性破断而导致隅角瓦斯超限,严重影响矿井安全的问题。为了解决端头悬顶的问题,揭示了采煤面端头三角区悬顶机理,据此提出了沿巷道方向和竖向的双向拉链式压裂方法;提出了沉积岩层水压裂缝扁球体压裂模型,计算出扁球体的长轴和高度,据此计算出压裂半径和压裂层位;顶板压裂过程中,水压力20~30 MPa,水压裂缝水平扩展半径5~7 m,竖向扩展长度2~3 m,水压裂缝呈扁球体扩展形态,验证了水压裂缝模型的准确性;通过双向拉链式水力压裂的现场应用,悬顶距离由压裂前的20 m减小为3~5 m,悬顶长度减小了80%,悬顶问题得到有效改善,证实了双向拉链式水力压裂方法的有效性。The hanging roof collapse in the triangle area of face end is not timely and prone to periodic breakage,which leads to the gas over run in the corner and seriously affects the safety of the mine.In order to solve the problem of end hanging roof,the mechanism of hanging roof in the triangle area of the end of coal mining face is revealed,and bidirectional zipper fracturing method along the direction and vertical of the roadway is proposed.The hydraulic fracture flat ellipsoid fracturing model of sedimentary rock layer is proposed,and the long axis and height of the flat sphere are calculated,and the fracturing radius and fracturing horizon are calculated accordingly.In the process of roof fracturing,the water pressure is 20-30 MPa,the horizontal propagation radius of water pressure fracture is 5-7 m,the vertical propagation length is 2-3 m,and the water pressure fracture is in the form of flat sphere expansion,which verifies the accuracy of the water pressure fracture model.Through the field application of bidirectional zipper hydraulic fracturing,the hanging roof distance is reduced from 20 m before fracturing to 3-5 m,the hanging roof length is reduced by 80%,and the hanging roof problem is effectively improved.The effectiveness of the bidirectional zipper hydraulic fracturing method is confirmed.

关 键 词：综采面 端头三角区 顶板预裂 切顶 压裂盲区 

分 类 号：TD327.2[矿业工程—矿井建设]