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Gas/water foams stabilized with a newly developed anionic surfactant for gas mobility control applications

Petroleum Science 2020年第4期17卷 1025-1036页

作者： mohammed aalmobarky Zuhair AlYousif David Schechter Department of Petroleum and Natural Gas Engineering College of EngineeringKing Saud UniversityRiyadhKingdom of Saudi Arabia Saudi Aramco DhahranKingdom of Saudi Arabia Harold Vance Petroleum Engineering Department Texas A&M UniversityCollege Station TXUSA

Carbon dioxide(CO2) flooding is one of the most globally used EOR processes to enhance oil ***,the low gas viscosity and density result in gas channeling and gravity override which lead to poor sweep *** application for mobility control is a promising technology to increase the gas viscosity,lower the mobility and improve the sweep efficiency in the *** is generated in the reservoir by co-injection of surfactant solutions and *** there are many surfactants that can be used for such purpose,their performance with supercritical CO2(ScCO2) is weak causing poor or loss of mobility *** experimental study evaluates a newly developed surfactant(CNF) that was introduced for ScCO2 mobility control in comparison with a common foaming agent,anionic alpha olefin sulfonate(AOS) *** work was divided into three stages:foam static tests,interfacial tension measurements,and foam dynamic *** surfactants were investigated at different *** general,results show that both surfactants are good foaming agents to reduce the mobility of ScCO2 with better performance of CNF *** tests in the presence of crude oil show that the foam life for CNF extends to more than 24 h but less than that for ***,CNF features lower critical micelle concentration(CMC),higher adsorption,and smaller area/molecule at the liquid-air ***,entering,spreading,and bridging coefficients indicate that CNF surfactant produces very stable foam with light crude oil in both deionized and saline water,whereas AOS was stable only in deionized *** all conditions for mobility reduction evaluation,CNF exhibits stronger flow resistance,higher foam viscosity,and higher mobility reduction factor than that of AOS *** addition,CNF and ScCO2 simultaneous injection produced 8.83% higher oil recovery than that of the baseline experiment and 7.87% higher than that of *** drop profiles

关键词： Supercritical CO2 foam Foam mobility control Foam flooding Enhanced oil recovery(EOR) Foam assisting CO2 EOR

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