| Over 50% of the original oil in place is left behind after primary and secondary recovery. Alkali-surfactant-polymer (ASP) flooding process has been found to be capable of recovering some of the oil left behind after primary and secondary recovery. The polymer increases the macroscopic displacement efficiency. The alkali and surfacant lower the interfacial tension (IFT) which results in higher microscopic displacement efficiency.;The interaction between the reservoir brine, alkali, surfactant and polymer was investigated. The slug was formulated with a mixture of sodium bicarbonate and sodium carbonate. B1083 anionic surfactant was chosen for the slug because it was thermally stable at the studied reservoir temperature of 90;An alkaline-surfactant-polymer enhanced oil recovery (EOR) scheme was proposed for Saudi Arabian limestone reservoirs. |
