Efficient Phase Equilibria Calculations in a Reduced Flash Context

Compositional models for hydrocarbon reservoirs become, every year, a better and better instrument for the evaluation of reservoir production. The phase equilibria calcuation represents one of the keys of the compositional simulator performance. Irrespective to the algorithm used to ensure the convergence toward the solution, all clasical models of two-phase flash calculation iterate on n independent variables (molar fractions, number of moles and logarithms of K-values), n being the number of components in the mixture