Oil recovery process employing a hydrocarbon slug and a thickene

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

1977-08-08

1978-11-14

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

252 855D, E21B 4322

Patent

active

041251580

ABSTRACT:
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.

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patent: 3491834 (1970-01-01), Ahearn et al.
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patent: 3637017 (1972-01-01), Gale et al.
patent: 3653437 (1972-04-01), Gale et al.
patent: 3768560 (1973-10-01), Hill et al.
patent: 3776309 (1973-12-01), Murray et al.
patent: 3983940 (1976-10-01), Carpenter, Jr. et al.

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