High salinity polymer drive for surfactant flooding systems

摘要

The invention is a method of recovering hydrocarbons from an underground hydrocarbon formation penetrated by at least one injection well and at least one production well, in which a saline polymer slug containing about 0.1% to about 3.0% of a drive fluid additive is injected into the formation after the injection of a saline surfactant slug. The drive fluid additive has the structure:PPR(C.sub.2 H.sub. 4 O).sub.n H.sub.y (SO.sub.3 M).sub.xPPwhere R is a phenol, an alkylphenol having up to about 4 carbon atoms in the alkyl chain, or the product of reduction of lignin in the presence of carbon monoxide or hydrogen at a temperature greater than about 200° C. and a pressure greater than about 100 psi, n has an average value of about 5 to about 30, x is 0 or 1, y is 1 if x is O, y is O if x is 1, and M is an alkali metal or ammonium ion.