关键词: DDM位移不连续方法, F准则, 裂缝扩展, 射孔方位

Abstract:

In terms of extensive literature review on influence of perforation in fracturing pressure and fracture geometry in hydraulic fracturing,DDM（Displacement Discontinuity Method）is applied for mechanics analysis in hydraulic fracturing by establishing propagation model under different perforation orientations and different farfield principal stress.Meanwhile,corrected G Criteria and F Criteria are used to study the propagation orientation.According to the simulation results under different perforation orientation and farfield principal stress ,fracturing pressure increases with the rise of the perforating angle and the fracture geometry is reversed at the same time.Meanwhile，uneven surface enlarges the friction of the fracturing fluid.Conclusions of the study offer reference to optimization of perforation parameters and fracturing implementation.

Key words: displacement discontinuity method, F Criteria, hydraulic fracture propagation, perforation orientation