Interfacial interactions between reservoir brine and CO2 at high pressures and elevated temperatures

In this paper, an experimental technique has been developed to study the interfacial interactions of the reservoir brine−CO2 system at high pressures and elevated temperatures. Using the axisymmetric drop shape analysis (ADSA) for the pendant drop case, this new technique makes it possible to determine the interfacial tension (IFT) and visualize the interfacial interactions between the reservoir brine and CO2 under practical reservoir conditions. More specifically, the dynamic IFT between the reservoir brine and CO2 is measured as a function of pressure at two different temperatures. It is found that the dynamic IFT gradually reduces to a constant value, which is termed as the equilibrium IFT. The equilibrium IFT decreases as the pressure increases, whereas the same parameter increases as the temperature increases. The major interfacial interactions observed in this study include interface disappearance, the swelling effect, the shrinking effect, and wettability alteration. At an elevated temperature (T =...

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