Abstract
The PVT properties of petroleum oils were studied using a modified Peng-Robinson equation of state and a characterization procedure developed for this purpose. Experimental data on constant mass expansion and differential vaporization of petroleum fluids from different fields were used. It was shown that currently available experimental properties of petroleum cuts (densities, molecular weights and normal boiling temperatures) can be used to obtain satisfactory predictions of the PVT properties of crude oils. The present results were compared with those obtained by using the method proposed by Pedersen. Both methods gave good predictions of the liquid shrinkage curve and saturation pressures. The tank oil density was also predicted satisfactorily with the present model.
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