Processes Responsible for Heavy-OiI Recovery by Alkali/Surfactant Flooding

摘要

This paper describes a suite of alkali/surfactant(AS)floods that were performed in systems containing viscous heavy oil(11 500 mPa·s).The study investigates how AS injection can be used to generate oil-in-water(OIW)emulsions,which can in turn improve sweep efficiencies and oil recovery.Data were obtained from coreflooding,with in-situ saturation measurements made using low-field huclear-mag-netic-resonance(NMR)analysis.The corefloods in this study indicate that emulsification is most efficient when used to block preformed water channels and improve the sweep efficiency of the flood.