General criterion for intersection between hydraulic induced fractures and pre-existing natural fractures
作者机构:State Key Laboratory of Oil&Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengdu610500China Engineering Technology Research Institute of Southwest Oil&Gas Field CompanyPetroChinaGuanghan618300China
出 版 物:《Petroleum》 (油气(英文))
年 卷 期:2019年第5卷第3期
页 面:315-320页
核心收录:
学科分类:08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)]
基 金:Sponsored by National Science and Technology Major Projects(2016ZX05052 2016ZX05014)
主 题:Hydraulic induced fracture Pre-existing natural fracture Intersection criterion Stress intensity factor Extended finite element method
摘 要:Pre-existing natural fractures and other structurally weak planes are usually well-developed in unconventional *** such fractures intersect with hydraulic induced fractures,they will redirect and propagate as an important mechanical principle of volume fracturing by the formation of complex fracture *** the shadow effect of natural fractures and other structurally weak planes with hydraulic supported fracture stress,hydraulic fractures do not fully propagate in the direction of the maximum *** paper computed the stress intensity factors of hydraulic fracture types I and II by integrating the various interactions,established universally-applicable mechanical principles for the propagation behavior when a hydraulic fracture propagating in an arbitrary direction intersects with a natural fracture at an arbitrary angle,and demonstrated the mechanical principles of the intersection between hydraulic induced fractures and pre-existing natural *** study proved the following conclusions:as the intersection angle between the hydraulic fracture and the maximum horizontal-principal-stress increased,the possibility of the hydraulic fracture being captured by the natural fracture with an identical approaching angle first increased and then decreased;as the net stress increased,the intersection behavior between the hydraulic fracture and the natural fracture transitioned from penetration to capture.