The Effect of Perforation Spacing on the Variation of Stress Shadow

When the shale gas reservoir is fractured, stress shadows can cause reorientation of hydraulic fractures and affect complexity. To reveal variation shadow with perforation spacing, numerical model between different spacing was simulated by extended finite element method (XFEM). The analyzed from two centers, fracture path, ratio length to spacing. simulations showed that rock at centers always in a state compressive stress, smaller higher maximum stress. Moreover, value directly reflect size effect, which changes propagation. extends 2.5 times effect strongest. In addition, small leads backward-spreading fractures, greater deflection degree fractures. Additionally, angle decreases expansion fracture. Furthermore, has an important influence on initiation pressure, pressure. At same time, there also minimizes However, when increases certain (the result this work about 14 m), pressure will not change. This study be useful guiding design programs simultaneous fracturing.