Accelerated explicit-implicit algorithms for the simulation of two-phase Flow toward a horizontal multistage hydraulically fractured well

Explicit-implicit approximation schemes for the numerical simulation of 3D two-phase flows toward a horizontal multistage hydraulically fractured well are proposed. This approach is based on the division of the computational domain into local subdomains and on using either an explicit or implicit scheme for the saturation transport equation with consideration of a local Courant number.