Abstract
Improvement of the oil recovery rate is of great importance for carbon dioxide enhanced oil recovery (CO_2EOR). Mixing phenomena of oil/CO_2 under high pressure is one of the most fundamental mechanisms in CO_2EOR, however, the mixing process is still not completely understood because of complexity of swelling, reduction of kinetics and interface tension. In this study, fundamental mixing process of decane/CO_2 was observed under high pressure. As the result, different mixing behavior was observed by changing concentration gradient of CO_2 in oil phase with a stirrer. Raman spectra which indicated dissolution process of oil in CO_2 phase were also obtained.
