水力压裂多尺度裂缝扩展及缝间干扰数值模拟
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中图分类号：TE357 文献标识码：A DOI：10.12473/CPM.202501010
Abstract：A large numberof fractures of diferent scales are developed withinthe shaleoil reservoir space.It is of great significance for the designand operationof hydraulic fracturing to study the multiscale fracture propagation morphology and the influence of inter-fracture interference on the fracture propagation.In this study，an extended finite element model（XFEM）of multiscale fracture propagation in hydraulicfracturing was established andvalidated.Using thismodel，themultiscale fracture propagation morphology and inter-fracture interference during propagation wereanalyzed，andthe influences of different fracturing conditions on fracture parameters（e. g.initiation pressure，width，and length）were identified.The results show that，during synchronous fracturing， theinward multiscale fracture propagation was suppressd toan increasing extent with the increase of one of the fracture scales；and during asynchronous fracturing，the first fracture closedand extended after theexpansion of the second fracture was completed.The perforation spacing had impacts on fracture initiation pressure，fracture widthandfracture length，andthelargerthefracturescale，thegreater thefracturespacing requiredforfull expansion.When the angle between the fracture and the direction of maximum principal stress reached 45∘ ，the inward fracture propagation was most strongly inhibited，the fracture initiation pressure reached the maximum，and the fracture width reached the minimum.The research results provide theoretical guidance and reference for the design and operation of hydraulic fracturing，and contributenew ideas for understanding how interference between multiscale hydraulicfractures during propagationafects fracture complexity，whichisasensitive factor for productivity.
Keywords：hydraulic fracturing；multiscale；fracture propagation；ABAQUS；XFEM;synchronous fracturing;fracture pressure
0 引言
中国页岩油气资源储量丰富，主要分布在鄂尔多斯、松辽、准噶尔、渤海湾和四川盆地，是未来推动国内油气增产稳产的重要接替资源[1-6]页岩油作为非常规油气藏，其储层通常具有低孔、低渗等特点，油气难以流动和聚集，导致开采难度较大[7-10]。（剩余12073字）