摘要：Firstly, the working principle and mechanism of directional hydraulic fracturing are introduced, then the finite element analysis of hydraulic fracturing is carried out by using the finite element software RFPA-FLOW. The crack propagation and the acoustic emission were obtained. Results show that, (1) Hydraulic fractures develop along the direction of maximum principal stress. (2) The heterogeneity coefficient and prefabricated crack inclination are positively correlated with the crack propagation angle. (3) The energy of acoustic emission accumulates more in the later stage of propagation when the heterogeneity coefficient is less than 10, while it is opposite when the heterogeneity coefficient is more than 10.
