Phase Behavior in EOR Surfactant Flooding

About 50 % of the crude oil is still remained in mature oil reservoirs and as the demand for oil is increasing enhanced recovery methods is widely applied. To improve the oil recovery by natural drive mechanism the most common approach is waterflooding, considered as a secondary oil recovery technique. The oil left in the swept zone after waterflood then becomes the main target for the following enhanced oil recovery (EOR) process also called tertiary oil recovery, [1]. Therefore EOR is introduced, where one among several techniques is surfactant flooding, which is studied in this work. The main target in EOR is to displace or alter the mobility of the oil remained in the reservoir, which is often distributed in pores where it is trapped thanks to capillary and viscous forces.