PETROLEUM RECOVERY PROCESS

摘要

An improved oil recovery method is disclosed in which a slug of a dilute aqueous polymer solution is injected into a subterranean oil-containing formation through one or more injection wells followed by a slug of dilute aqueous solution of an alkali metal hypochlorite. Optionally, either or both of the injected solutions may contain a surfactant. In a final step, water is injected to drive the polymer and hypochlorite solutions through the formation and oil is recovered from the formation through at least one spaced production well.