Oil recovery process employing a hydrocarbon slug and a...

Details Oil recovery process employing a hydrocarbon slug and a... Oil recovery process employing a hydrocarbon slug and a...

E - Fixed Constructions

21

B

166/32

E21B 43/22 (2006.01)

Patent

CA 1075596

F-9452 OIL RECOVERY PROCESS EMPLOYING A HYDROCARBON SLUG AND A THICKENED AQUEOUS SURFACTANT SLUG Abstract of the Disclosure The recovery of oil by surfactant waterflooding involving the injection of a hydrocarbon slug followed by a thickened aqueous surfactant slug. The hydrocarbon slug is injected into the reservoir in an amount of at least 0.02 pore volume and has a viscosity less than that of the reservoir oil. The thickened surfactant slug comprises an aqueous solution of a surfactant system which includes an organic sulfonate surfactant and which functions to increase the viscosity of the aqueous liquid to a value at least as great as the viscosity of the reservoir oil while decreasing the oil-water interfacial tension. The surfactant slug may include one or more organic sulfonates, either alone or in mixture with a water-soluble aliphatic alcohol. -1-

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