Numerical simulation of hydraulic fracturing process based on peridynamics method
WU Fan;LI Shuhui;DUAN Qinglin;LI Xikui;ZHANG Hongwu;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology;
Due to the advantages of peridynamics method in dealing with the initiation,propagation and branching of multiple cracks,it is introduced into the numerical simulation on the hydraulic facture process of shale. Combining with the hydraulic fracture mechanism,a method for tracing crack path according to damage degree in peridynamics is proposed in which the hydraulic pressure is applied in the normal direction of the newly generated crack surface. The cracking pressure of single horizontal well in cross section and the hydraulic fracture of the horizontal well with single and multiple perforations in longitudinal section are successfully simulated by the method. The crack net due to fracturing is obtained. The numerical results also show that the initial perforations have significant effect in the subsequent hydraulic fracture process.