Numerical Analysis of Multiple Factors Affecting Hydraulic Fracturing in Heterogeneous Reservoirs Using a Coupled Hydraulic-Mechanical-Damage Model

Hydraulic fracturing performance, affected by multiple factors, was essential to the economic exploitation of oil and gas in heterogeneous unconventional reservoirs. Multifactor analysis can gain insight into response reservoirs turn optimize treatment design. Based on characterizations geological setting a glutenite reservoir, hydraulic fracture (HF) initiation propagation process, as well stimulated reservoir volume (SRV), were simulated analyzed using coupled hydraulic-mechanical-damage model. The Weibull distribution employed describe rock heterogeneity. numerical model verified with microseism (MS) interpretation results HF geometry. A multifactor optimization workflow integrating surface methodology, central composite design (CCD), simulations proposed investigate coupling effects geomechanical hydrofracturing factors SRV identify optimum treatment. showed that horizontal stress difference injection rate most significant control SRV. Increasing reducing fluid viscosity may contribute improving It is more difficult increase at higher than lower difference. introduced this work practical effective method geometry improve This study provided deep understanding mechanism possessed theoretical significance for