Finite Element Simulation of Fracture Propagation Path During Oriented Perforation Steering Fracturing in Low Permeability Coal Seam

In order to clarify the fracture propagation track and the variation rule of deflection distance in the course of directional perforation turning fracturing in low permeability coal seam, based on ABAQUS platform, the deflection process of the hydraulic fracture in coal seam is simulated by extended finite element. Taking the coal seam of Shizhuang block in the south of Qinshui Basin as an example, the effects of horizontal in situ stress difference, perforation parameters, injection parameters on formation fracture pressure and deflection distance in the process of oriented perforation steering fracturing are studied. The results show that, the formation fracture pressure increases linearly with the increase of perforation azimuth and horizontal in-situ stress difference, and logarithmically with the increase of fracturing fluid displacement. The viscosity of fracturing fluid has little effect on formation fracture pressure. The fracture deflection distance increases linearly with the increase of perforation azimuth and fracturing fluid displacement, and decreases linearly with the increase of horizontal in-situ stress difference and fracturing fluid viscosity.