Alkaline-surfactant-polymer (ASP) flooding is a combination process in which alkali, surfactant and polymer are injected at the same slug. Because of the synergy of these three components, ASP is the current world-wide focus of research and field trial in chemical enhanced oil recovery.
This paper is to provide a comprehensive review of the ASP process. The reviewed topics include the following:
ASP synergy and its EOR mechanisms
Numerical simulation work
Summary of pilots and large-scale applications
Mobility control requirement
Problems associated with ASP flooding
In addition to the comprehensive review, future developments are also discussed. Data and analyzed results presented in this review will help oil operators save research and pilot costs, and to build their confidence to execute and expedite their ASP projects.