天然裂缝角度对水力压裂的影响数值分析  

Numerical Analysis of the Influence of Natural Fracture Angle on Hydraulic Fracturing

作　　者：张健[1,2] 王金意 荆铁亚[1,2] 张国祥 马海春[3] ZHANG Jian;WANG Jinyi;JING Tieya;ZHANG Guoxiang;MA Haichun(Huaneng Clean Energy Research Institute, Beijing 102209, China;Beijing Key Laboratory of Carbon Dioxide Capture and Treatment, Beijing 102209, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]中国华能集团清洁能源技术研究院有限公司,北京102209 [2]二氧化碳捕集与处理北京市重点实验室,北京102209 [3]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《常州大学学报（自然科学版）》2020年第3期34-39,共6页Journal of Changzhou University：Natural Science Edition

基　　金：中国华能集团资助项目(CERI/TY-19-HJK03)。

摘　　要：为了分析天然裂缝对水力压裂的裂纹发育影响情况,开展了页岩水力压裂模型试验,实验结果显示天然裂缝对裂纹有多种不同的影响效果。通过cohesive单元设置不同的天然裂缝角度分析天然裂缝角度对水力压裂的影响,得到当岩层处于均匀的地应力状态下,天然裂缝角度会影响水力裂缝的扩展路径以及裂缝宽度。水力裂缝沿着天然裂缝延伸时,天然裂缝角度不同会影响水力裂缝的裂缝宽度。天然裂缝的角度θ会影响压裂液向周围岩体的渗流方向以及渗流速度,随着角度的增加,渗流速度降低。天然裂缝角度θ会影响孔压的大小,孔压的影响范围以及应力分布。In order to analyze the structure plane effects on the development of crack face for hydraulic fracturing,hydraulic fracturing of shale model tests were carried out.The effect of the natural fracture angle on the hydraulic fracturing is analyzed by setting different natural fracture angles through the cohesive unit,and the natural fracture angle can affect the expansion path and the crack width of the hydraulic fracture when the rock formation is in a uniform ground stress state.The natural fracture angle can affect the crack width of the hydraulic fracture when the hydraulic fracture extends along the natural crack.The angle of the natural fracture can affect the seepage direction and the seepage velocity of the fracturing fluid to the surrounding rock mass.The seepage velocity decreases with the increase of the angle.The angle of natural fracture can affect the size of the pore pressure,the influence scope of the pore pressure,and the stress distribution of shale.

关 键 词：水力压裂 数值分析 天然裂缝角度 裂缝 

分 类 号：TV131[水利工程—水力学及河流动力学] O241[理学—计算数学]