A unique approach to predict accurate heavy oil density with new three parameter cubic equation of state

A unique approach is proposed to predict the heavy oil density using a recently developed three parameter cubic equation of state for heavy pure components. It predicts the heavy oil density with an AAD of 2.5%. The new model does not require any experimental density data for its tuning. The basic assumption in this work is that heavy oil is a mixture of n ‐alkanes and aromatics as the most prominent groups. Critical pressure characterisation for pseudo fractions is done by tuning a perturbation factor ( f c ), also representing the aromaticity, to match the predicted saturation pressure with the experimental pressure. The parameter ‘ u ’ for the pseudo fractions is adjusted using another parameter ‘ S ’ which was found to vary linearly with f c .