河南理工大学学报（自然科学版）2018，Vol.37Issue(2)：124-132,9.DOI:10.16186/j.cnki.1673-9787.2018.02.018
定向射孔水力压裂平面裂缝形态数值研究
Numeric simulation of plane strain hydraulic fracturing under multi-oriented perforations
摘要
Abstract
In order to study the complex morphology of hydraulic fracturing under multi-oriented perforations,the finite element method(FEM) with creative points is proposed.The coupling principle is based on concepts of pore-elasticity proposed by Zimmerman's criterions of hydraulic fracturing and the constitutive relation of fracturing opening with fluid pressure is based on the concepts of damage localization.The identification of crack initiative positions and propagation path around the borehole is based on the anisotropic modeling of the fractured property parameters.The coupling program is developed on the platform of ANSYS.Through the program,the hydraulic fracture of plane strain (KGD) under the condition of oriented perforation(straight lineshaped,two-cross straight line-shaped and three lines in Y-shaped) is simulated.The results show that the reasons of complex configurations of the hydraulic fracturing lies in the traction of the maximum compressive principal stress,the steering traction of the oriented perforations,the competitive tractions on the fracture propagation and stress concentration on the bottom of the perforations.The combination of these result in all kinds of fracture configurations.Under the condition of multi-perforation,there are two growth mechanisms for the fracturing branches,i.e.the competitive and coexistence.关键词
水力压裂/渗流/损伤/定向射孔Key words
Hydraulic fracture/porous flow/damage/numeric simulation/oriented perforation分类
矿业与冶金引用本文复制引用
王利,张新生,曹运兴,田林..定向射孔水力压裂平面裂缝形态数值研究[J].河南理工大学学报（自然科学版）,2018,37(2):124-132,9.基金项目
“十三五”国家重大专项课题(2016ZX05067006-002) （2016ZX05067006-002）
