EOS compositional and surfactant models are coupled in a fully implicit parallel reservoir simulator using Equivalent Alkane Carbon Number (EACN) of oleic phase. The EACN of the oleic phase is computed using a mole-fraction-weighted carbon number for each component present in the oleic phase. Important microemulsion properties such as optimum salinity and optimum solubilization parameter as a function of EACN of oleic phase are implemented based on known correlations. The simulator developed is validated using our IMPEC chemical flooding simulator, UTCHEM. Case studies including a large-scale simulation emphasize that surfactant floods should be carefully modeled taking EACN of crude oil into consideration for more realistic and accurate oil recovery predictions.

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