Experiment and correlation of the equilibrium interfacial tension for paraffin + CO2 modified with ethanol

The IFTs of five paraffins+CO2 modified with ethanol at different temperatures and pressures with different ethanol mole fractions were measured by pendent drop method. The IFTs of paraffin+CO2 were decreased after CO2 was modified with ethanol. New correlation for predicting the IFTs of paraffin+modified CO2 systems were proposed based on experimental IFT values. The R2, RMSE and AARD were 0.9948, 0.15 and 2.49%, respectively. The paraffin IFTs for modified CO2 and pure CO2 flooding were compared by the IFT average absolute decrease ratio (AADR). The AADR increased with the ethanol mole fractions and decreased as the temperature increasing.