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Carbon dioxide (CO2) injection is a well-established enhanced oil recovery method. The optimization process of CO2 injection is usually performed through estimation of two physical properties, i.e., minimum miscibility and first-contact miscibility pressures (MMP and FCMP) for the crude oil–CO2 system. In this experimental study, the equilibrium IFT of the crude oil–CO2 system is measured at (313.15 and 323.15 K) for two oil types (i.e., live and dead crude oil) using the axisymmetric pendant drop shape analysis method. Vanishing interfacial tension technique is also applied to estimate the MMP and FCMP. The experimental results demonstrate that IFT decreases with different trends as the equilibrium pressure increases for the systems of live oil/CO2 and dead oil/CO2 systems. The IFT test results demonstrate that the estimated MMP and FCMP values of crude oil–CO2 system increase with temperature. It was also observed that the presence of methane gas in the oil phase increases the MMP value, whereas it decreases the FCMP.

Experimental investigation of miscibility conditions of dead and live asphaltenic crude oil–CO2 systems