Thermodynamically consistent criteria for developing reliable equation of state model for compositional simulation

Total of 28 reservoir fluids have been considered in this study. On average 11 EOS models have been developed for a fluid by matching saturation pressure and saturation density data. For each of EOS model, Gibbs free energy of mixing and minimum miscibility pressure (for oils) and Gibbs free energy of mixing and CVD liquid saturation (for gas condensates) are calculated at the saturation pressure and reservoir temperature. Trends of Gibbs free energy of mixing and deviation in MMP and CVD liquid saturation predictions for all fluids confirms the criterion.