裂缝性储层中水力裂缝扩展规律的试验研究  

Experimental study on hydraulic fracture propagation in fractured reservoir

作　　者：马耕[1,2,3] 张帆 刘晓[1,3] 冯丹[4] 

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454003 [2]河南能源化工集团研究院有限责任公司,河南郑州450046 [3]中原经济区煤层(页岩)气河南省协同创新中心,河南焦作454003 [4]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044

出　　处：《采矿与安全工程学报》2017年第5期993-999,共7页Journal of Mining & Safety Engineering

基　　金：河南省教育厅科学技术研究重点项目(13A440320);2014年度安全生产重大事故防治关键技术重点科技项目(Henan-066-2013AQ);2015年安全生产重大事故防治关键技术重点科技项目(Henan-0007-2015AQ)

摘　　要：为探究煤储层中天然裂缝对形成裂缝网络的影响机理,以人工预置裂缝的相似材料试件为研究对象,采用室内试验系统进行了水力压裂物理模拟试验,并通过三维扫描系统对破裂面信息进行处理。结果表明:煤储层中天然裂缝的存在导致起裂压力降低,泵注压力产生二次峰值;不同的天然裂缝形态对水力裂缝的延伸路径影响也不同,平行于最大主应力方向的天然裂缝影响尤为明显;压裂过程中主裂缝遇到天然裂缝后,水力裂缝的延伸路径发生变化,主裂缝与天然裂缝发生贯通、扩展延伸,形成裂缝网络系统,为煤层气提供了快捷的运移通道。To explore the influence mechanism of natural fracture on forming of fracture network in a coal reservoir, a hydraulic fracture physical simulation is carded out through the laboratory test system by using specimens made by similar materials with artificial pre-eracks as the research object. Details of the fracture surface are obtained by the 3D scanning device. The research results indicate that the pres- ence of natural fractures in a coal reservoir results in a decrease of the initiation pressure and occurring of the second peak of water pressure. Effects of different natural fracture morphologies on the extended path of hydraulic fracture also vary, the influence induced by natural fracture parallel to the maximum principal stress is particularly evidently. The path of hydraulic fracture changes when it encounters natural fracture during fracturing. Main cracks could link up with natural fracture and continue to extend. The fracture network system forms which provides a path for quick coalbed methane migration.

关 键 词：煤层气 水力压裂 天然裂缝 裂缝网络 三维扫描 

分 类 号：TD353[矿业工程—矿井建设]