Abstract
An understanding of dissolution process and phase behavior in oil/CO_2 binary system under high pressure are of great importance to improve the oil recovery rate in carbon dioxide enhanced oil recovery (CO_2EOR). However, the non-equiliborium systems are less well understood even though the equilibrium phase behaviors in the binary systems have been reported by many researchers. In this study, the non-equilibrium dissolution process in decane/CO_2 binary system was observed. CO_2 concentration disribution in the liquid phase was measured by using laser Raman spectroscopy. Moreover, liquid-liquid-vapor three phase equilibrium in decane/CO_2 binary system was successfully observed when the pressure is being reduced.
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