t Jafari Behbahani - Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O.Box:۱۱۳۶۵-۹۴۶۵, Azadi Avenue, Tehran, Iran
c ghotbi - Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O.Box:۱۱۳۶۵-۹۴۶۵, Azadi Avenue, Tehran, Iran
v Taghikhani - Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O.Box:۱۱۳۶۵-۹۴۶۵, Azadi Avenue, Tehran, Iran
a Shahrabadi - Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O.Box:۱۱۳۶۵-۹۴۶۵, Azadi Avenue, Tehran, Iran

An experimental study and thermodynamic modeling was conducted to quantify the phase behavior and physical properties of Iranian crude oil sample. The oil sample was compositionally characterized by the distillation technique. Also, Differential liberation tests and flash were conducted on oil sample. Experiment results for phase behavior and reservoir fluid properties were used to evaluation the reliabilities of three cubic equation of state, including Peng-Robinson, Pate-Teja and Soave-Redlich-Kwong for predicting flash calculation, and differential liberation test simulation of Iranian crude oil. Results show that heavy components in the petroleum mixtures based on the comparisons with the experimental data have the strongest effect on the characteristics of the fluids. It is obvious that Pate-Teja equation is superior in the calculations composition gas phase in higher pressure . Also, flash calculations based on Pate-Teja equation in case of lumping is more accurate than results obtained by Peng-Robinson and Soave-Redlich-Kwong equations. Comparison of predicted oil Specific Gravity, Gas Oil Ratio, relative volume and compressibility factor of the liberated gas based on Pate-Teja equation to experimental data shows better agreement than other equations. It should be noted that modeling of Gas Oil Ratio and relative volume has better agreement with experimental data in higher pressure

Petroleum, Phase equilibrium, Cubic equation of state, differential liberation test simulation, Flash calculation, reservoir fluid