Numerical Study on the Use of Alternating Injection Hydraulic Fracturing Technology to Optimize the Interaction Between Hydraulic Fracture and Natural Fracture

Hydraulic fracturing is a key technology for shale gas production. Activating the natural fracture (NF) system in reservoirs and forming complex network can greatly improve effect of fracturing. The mainly influenced by geological factors operational parameters reservoir. Effectively reforming reservoir under unfavourable conditions maximizing activation NFs substantially increase its reformed volume production gas. Alternating fluid injection (AFI) technologies using multiple fluids with different viscosities activate closed while retaining high conductivity principal to achieve larger stimulated (SRV). In this paper, hydraulic-mechanical coupling finite element method (FEM) established, AFI numerically simulated continuum method. addition, propagation stage path are discussed. results show that form fractures comparatively paths.