Experimental study of alkaline-surfactant-polymer compositions for ASP-flooding of cores from highly viscous oil reservoirs

Abstract

The paper presents experiments on using alkali–surfactant–polymer compositions (for ASP flooding) in tests on cores saturated with highly viscous oil. The phase behavior was evaluated for solutions with different concentrations of alkali (NaOH) and surfactant (SDS) after mixing with highly viscous oil samples; this defined the optimal agent com-positions for producing Winsor type III emulsions. Experiments on core saturated with highly viscous oil demonstrated the pumping of ASP agent in the form of aquatic solutions surfactant/alkali and polymer after regular water flooding give the gain in the oil displacement in the range from 19 to 37 %.