A new four-phase adaptive implicit method for compositional reservoir simulation

Estimating oil and gas production from assets is essential to carry recovery processes. From the many techniques tools used for such a task, compositional simulation model important miscible displacement problems with complex phase behavior. In this model, fluid flow in porous media described by set of conservation equations. The solution these involves spatial time discretization schemes approaches handling coupling As consequence, several algorithms arise combining different selection primary variables equations, behavior decoupling techniques, spatial/time discretization, which define computational performance algorithms. work, new Adaptive Implicit Method (AIM) proposed global intensive Fully (FI) formulation an IMPEC (IMplicit Pressure, Explicit Compositions) approach. approach, gridblocks are dynamically selected as FI or based on stability analysis algorithm. fully implicit part considers pressure, water saturation, overall compositions approach pressure total number moles each component variables. A algorithm up four-phases, but it general enough be any phases. eigenvalues amplification matrix computed using Power's iteration method. implemented in-house simulator called UTCOMPRS. AIM compared versions. We observed considerable improvement UTCOMPRS when pure formulations.