Oil recovery by waterflooding with thickened surfactant solution

Details Oil recovery by waterflooding with thickened surfactant solution Oil recovery by waterflooding with thickened surfactant solution

1977-12-12

1980-01-01

Guynn, Herbert B.

Wells

Processes

Distinct, separate injection and producing wells

252 855D, E21B 4322

Patent

active

041811780

ABSTRACT:
Waterflooding process for the recovery of oil for 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.

REFERENCES:
patent: 3827497 (1974-08-01), Dycus et al.
patent: 3888308 (1975-06-01), Gale et al.
patent: 3977471 (1976-08-01), Gale et al.
patent: 4018278 (1977-04-01), Shupe
patent: 4042030 (1977-08-01), Savins et al.
patent: 4077471 (1978-03-01), Shupe et al.

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