Effect of CO2 on the interfacial tension and swelling of crude oil during carbonated water flooding

Abstract Since the influence of carbon dioxide (CO 2 ) on dynamic interfacial tension crude oil and aqueous solutions at elevated temperatures pressures is an important issue, this investigation aimed to measure IFT oil/water, CO , carbonated water. The measured values reveal that IFTs oil/CO are decreased through first interval, while a gradual continuous reduction in obtained second interval. Although both intercepts slopes interval lines more than for all studied temperatures, they show similar trend as function temperature. used vanishing method measurement reveals minimum miscibility pressure (MMP), contact pressure, intersection point (where linear curves change) two equations have increasing temperature changes. However, was not observed solution saturated with (i.e., water) which can be related difference between liquid- gas-phase behavior well formation carbonic acid water process. reduced from 18.6 mN/m (@ pH = 8) 0.3 14) increase solution, conditions cases higher MMP points. Considerably were presence range 9.1–17.5 12.2–17.4 mN/m, respectively. most feature CW process swelling factor due fact up 40% achieved (75 °C) (4500 psi) after only1600 s.