| 摘要 |
A post-primary oil recovery process for recovering oil from a subterranean formation may involve injecting into a crude oil-bearing subterranean formation an aqueous saline surfactant composition of brine, Alkyl Polyglucoside, Linear Primary Alcohol Ethoxylate, sodium hydroxide and alcohols; displacing the aqueous composition through the oil-bearing formation and driving oil from the oil-bearing formation; and recovering oil displaced from the subterranean formation. The injecting step may be preceded by the step of injecting into the subterranean formation a volume of salinity water to adjust salinity of connate water within the subterranean reservoir to a predetermined salinity. Injection of the surfactant composition may further be followed by injection of a buffer comprising water dispersible polymeric viscosifier or water soluble polymeric viscosifier. The surfactant composition may additionally contain at least one cosurfactant selected from hydrocarbon sulfonates and alcohols. The aqueous saline surfactant composition may be or include SCHMOO-B-GONE SURFACTANT®. |
