Oil recovery by viscous waterflooding

Details Oil recovery by viscous waterflooding Oil recovery by viscous waterflooding

E - Fixed Constructions

21

B

166/31

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

Patent

CA 1053147

OIL RECOVERY BY VISCOUS WATERFLOODING Abstract of the Disclosure Waterflooding process for the recovery of oil in which at least a portion of the injected water is thickened by the addition of a sulfonate surfactant and a C4-C6 aliphatic alcohol having a hydrocarbon chain link of at least 3 carbon atoms. The action of the surfactant- alcohol system in increasing the viscosity of the water varies with the monovalent salt salinity of the water and the ratio of the amount of the sulfonate surfactant to the sum of the amounts of the sulfonate surfactant and alcohol in the water. A relatively viscous aqueous mobility control slug containing a sulfonate-alcohol system as previously described may be preceded by an aqueous surfactant slug. The aqueous solution of sulfonate surfactant and alcohol may be formulated and then aged for a time to allow the development of viscosity prior to injection into the oil reservoir. This viscosity development may be accelerated by heating. -1-

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