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- W2618035815 abstract "Abstract In this study, oil-free steady-state foam flooding experiments were performed in a sandstone core above the supercritical conditions of CO 2 using two different surfactants – fluorosurfactant FS-51 and alpha-olefin-sulfonate (AOS). Effect of addition of N 2 to sc-CO 2 -foam in different proportions on stability and structure of CO 2 /N 2 was investigated with the two different surfactants. Co-injection of all three fluids – surfactant, CO 2 and N 2 was performed and pressure drop (ΔP) data across the core was recorded and foam images were captured through a visual cell and analyzed using ‘ImageJ’ image analysis software. Interfacial tension experiments were also performed at same pressure and temperature conditions as foam-flooding experiments to determine the critical micelle concentration (CMC) of the two surfactants. The surfactants were injected above their CMC’s during foam-flooding experiments. Results from the foam-flooding experiments showed improvement in foam strength as N 2 is added to CO 2 above its supercritical conditions. The improvement in foam strength was evident by increase in steady-state pressure drop (ΔP) across the core. Analysis of captured foam images also provided evidence of increasing foam strength as the circularity of foam bubbles was significantly enhanced with addition of N 2 . This study aims to provide a solution to the problem of weakening of sc-CO 2 -foam. The number of CO 2 -EOR projects around the world is increasing in lieu with the need of CO 2 sequestration. The results from this study provide a safe and effective method to improve CO 2 -foam at high pressure and temperature reservoir conditions. The results from this study could develop CO 2 -foam EOR potential and help in keeping as much as CO 2 below the ground." @default.
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- W2618035815 date "2017-12-01" @default.
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- W2618035815 title "Stability and texture of CO 2 /N 2 foam in sandstone" @default.
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- W2618035815 doi "https://doi.org/10.1016/j.colsurfa.2017.04.049" @default.
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