Numeric simulation of plane strain hydraulic fracturing under multi-oriented perforations
WANG Li
ZHANG Xinsheng
CAO Yunxing
TIAN Lin
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.
Keywords：Hydraulic fractureporous flowdamagenumeric simulationoriented perforation
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 124-132 )