Waterflooding with thickened surfactant solution containing...

Details Waterflooding with thickened surfactant solution containing... Waterflooding with thickened surfactant solution containing...

C - Chemistry, Metallurgy

09

K

31/16

C09K 8/584 (2006.01)

Patent

CA 1091437

OIL RECOVERY BY WATERFLOODING WITH THICKENED SURFACTANT SOLUTIONS Abstract of the Disclosure Waterflooding process for the recovery of oil from a subterranean formation in which at least a portion of the injected water is thickened by the addition of a sulfonated polyethoxylated aliphatic alcohol surfactant. The thickened water has a salinity within the range of 5-18 percent. The sulfonated polyethoxylated aliphatic alcohol has at least two ethylene oxide units to provide an HLB within the range of 10.0-14.0 and the lipophilic base contains from 16 to 20 carbon atoms. The thickened surfactant slug may be preceded by the injection of a relatively low viscosity surfactant slug and viscosity gradation of the thickened surfactant slug may be accomplished by varying the salinity and/or the concentration of the sulfonated polyethoxylated aliphatic alcohol. -1-

311519

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