Hydromechanical-Coupled Cohesive Interface Simulation of Complex Fracture Network Induced by Hydrofracturing with Low-Viscosity Supercritical CO2

Abstract Hydraulic fracturing experiments with low-viscosity fluids, such as supercritical CO2, demonstrate the formation of complex fracture networks spread throughout rocks. To study influence viscosity fluids on hydraulic propagation, a hydromechanical-coupled cohesive zone model is proposed for simulation mechanical response rock grains boundary separation. This methodology considers synergistic effects unsteady flow in and grain deformation induced by pressure. The results indicate tendency propagation more branches decrease, which accord experimental results. fluid can into microfractures extremely small aperture create shear failed fracture. confirms possibility effective well stimulations fluids.