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Synergistic Effects of 2-Ethoxyethanol and Dissolved CO2 on Interfacial Tension Reduction, Wettability Alteration, and Oil Swelling through Carbonated Water Flooding in Carbonate-Sandstone Reservoirs
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DOI：10.1016/j.petlm.2026.04.018.png)
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Abstract
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• The synergistic effect of dissolved CO2 and 2-ethoxyethanol reduces interfacial tension. • Optimal solvent concentration (15 vol%) significantly enhances oil swelling up to 33 %. • Surface wettability of composite (calcite–dolomite–quartz) alters from oil-wet to water-wet. • Moderate salinity (10,000–15,000 ppm) promotes interfacial properties. • The combined CO2–2-ethoxyethanol system shows strong potential for chemical water flooding.
Keywords:
Synergistic Effect
2-ethoxyethanol
Carbonated Water
Interfacial Tension
Wettability Alteration
Oil Swelling
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