Measurement and correlation of the interfacial tension for paraffin + CO2 and (CO2+N2) mixture gas at elevated temperatures and pressures

The IFTs of five paraffins with different injection gases were measured by pendent drop method. The relative Gibbs adsorption isotherm (Γ12) were calculated by experimental IFTs. The new correlations present IFT as a function of reservoir temperature, pressure, paraffin chain length and N2 mole fraction. The R2, RMSE and AARD of the correlation for the pure CO2 injection were 0.9884, 0.58 and 5.45%, respectively. The R2, RMSE and AARD of the correlation for the mixture gas injection were 0.9851, 0.57 and 4.47%, respectively. LOOCV and external validation methods were used to check the reliability and accuracy of the new correlations.179