Computation of Multiphase Equilibrium For Compositional Simulation

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Abstract
A numerical scheme has been developed for calculation of multiphase equilibria. The scheme is applied to a thermodynamic model that employs a modified version of the Peng-Robinson equation for all phases except possibly an aqueous phase. Henry's constants are used for computation of solute fugacities in the water phase. The numerical scheme makes "optimal" use of first-and second-order iterative schemes and circumvents the problems reported by previous investigators. An outline of the scheme is presented with references to other sources where complete details are available. Examples of two-, three-, and four-phase separations are presented to demonstrate the range of the proposed scheme. Limited comparison with experimental data also is provided. The scheme may be embedded in compositional reservoir simulators for the modeling of oil recovery by such processes as hydrocarbon gas injection, nitrogen injection, and CO2 floods.

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