CHARACTERIZATION OF HEAVY OILS

The PVT properties of petroleum oils were studied using a modified Pen g-Robinson equation of state and a characterization procedure develope d for this purpose. Experimental data on constant mass expansion and d ifferential vaporization of petroleum fluids from different fields wer e used. It was shown that currently available experimental properties of petroleum cuts (densities, molecular weights and normal boiling tem peratures) can be used to obtain satisfactory predictions of the PVT p roperties of crude oils. The present results were compared with those obtained by using the method proposed by Pedersen. Both methods gave g ood predictions of the liquid shrinkage curve and saturation pressures . The tank oil density was also predicted satifactorily with the prese nt model.