High salinity polymer drive for surfactant flooding systems

E - Fixed Constructions – 21 – B

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E21B 43/22 (2006.01) C09K 8/58 (2006.01) C09K 8/584 (2006.01)

Patent

CA 1286981

HIGH SALINITY POLYMER DRIVE FOR SURFACTANT FLOODING SYSTEMS ABSTRACT OF THE DISCLOSURE 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: R(C2H4O)nHy(SO3M)x where 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.

570573

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