大尺寸复杂应力水力压裂裂缝扩展模拟试验研究  

Experimental study on hydraulic fracturing propagation in coal/rock with large size and complex stress

作　　者：陶云奇[1,2] 刘东[1,2,3] 许江 张帆[2] TAOYunqi;LIU Dong;XU Jiang;ZHANG Fan(State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China;Yongcheng Coal & Electricity Holding Group Co Ltd, Yongcheng, Henan 470031, China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]河南理工大学能源科学与工程学院,河南焦作454003 [3]永城煤电控股集团有限公司,河南永城470031

出　　处：《采矿与安全工程学报》2019年第2期405-412,共8页Journal of Mining & Safety Engineering

基　　金：煤矿灾害动力学与控制国家重点实验室访问学者基金项目(2011DA105287-FW201409);河南省创新型科技人才队伍建设工程项目(164100510024);国家科技部创新方法工作专项项目(2016IM010400);河南省科技攻关项目(152102310095)

摘　　要：为了研究复杂应力条件下的水力压裂裂缝扩展规律,本文借助自主研发的多场耦合煤层气开采物理模拟试验系统进行了大尺寸的水力压裂物理模拟,通过泵注石膏液充填水力压裂裂缝,以观测裂缝的开裂形态及扩展方位,并得到了不同压裂点的力、位移、水压与时间的关系曲线。研究表明,煤岩体中的水压力随着压裂液的持续泵注呈上升趋势,在压裂管周围的变化趋势与水压非常相似;试样在力的作用下有一定的位移,呈正相关。通过凝固的石膏可以看到水力压裂裂缝的完整形态,从而推断出裂缝的起裂、延伸路径,以期为煤层气水力压裂技术的研究提供数据参考和理论依据。To figure out the performance of hydraulic fracture propagation under the complex stress condition, large-size hydraulic fracturing physical simulation experiment was conducted by using multi-field coupling test system for coal-bed methane(CBM) exploitation. Hydraulic fracture morphology and propagation were observed directly by pumping gypsum liquid into fractures. Meanwhile, the relations between stress, displacement, water pressure of different fracturing points and time were analyzed.Results indicate that water pressure in coal rock increases with continuous pumping of fracturing fluid,which is very similar with the trend of water pressure around fracturing pipe. Displacement occurs under the effect of stress, and there is a positive correlation between them. Total hydraulic fracture morphology can be inferred based on the coagulated gypsum, which provides evidence for studying hydraulic fracture morphology and propagation path. The research results could provide data reference and theoretical support for hydraulic fracturing technology in CBM reservoir.

关 键 词：煤层气 水力压裂 位移 裂缝形态 物理模拟 

分 类 号：TD712[矿业工程—矿井通风与安全]