Delayed polyacrylamide gelation process for oil recovery applications

摘要

A process for delaying the gelation rate of a polymer used in oil recovery applications. A gel is prepared by mixing a single aqueous gelation solution at the surface made up of a polyvalent metal cross- linking agent and a polyacrylamide having no hydrolysis or only a limited degree of hydrolysis. The solution is injected into a desired treatment region and gelled to completion in situ.