Surfactant waterflooding with hydrocarbon slug preceding...

Details Surfactant waterflooding with hydrocarbon slug preceding... Surfactant waterflooding with hydrocarbon slug preceding...

E - Fixed Constructions

21

B

166/33

E21B 43/00 (2006.01) C09K 8/58 (2006.01)

Patent

CA 1064817

SURFACTANT WATERFLOODING WITH HYDROCARBON SLUG PRECEDING SURFACTANT SLUG Abstract of the Disclosure Surfactant waterflooding process involving the injection of a hydrocarbon slug followed by a surfactant slug and a mobility control slug. The hydrocarbon slug has a viscosity less than that of the reservoir oil and is injected within the range of 0.01-0.04 pore volume. The surfactant slug is injected in an amount within the range of 0.05-0.3 pore volume and exhibits a surfactant concentration within the range of 0.5-4.0 weight percent. At least a portion of the mobility control slug has a viscosity at least as great as the viscosity of the hydrocarbon slug. -1-

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