Double tapered surfactant waterflood oil recovery process

Details Double tapered surfactant waterflood oil recovery process Double tapered surfactant waterflood oil recovery process

1979-11-26

1980-11-11

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166274, E21B 4322

Patent

active

042327377

ABSTRACT:
Disclosed is an oil recovery process for recovering oil from subterranean formations containing relatively high salinity water, said process employing an aqueous surfactant fluid containing at least two surfactants, one primary anionic surfactant such as petroleum sulfonate and a solubilizing cosurfactant such as an alkyl or alkylaryl, polyethoxy sulfate or sulfonate. The process comprises injecting a plurality of slugs of surfactant fluids followed by a low salinity fluid containing a viscosifying amount of a hydrophilic polymer. The salinity and concentration of solubilizing cosurfactant of each surfactant slug are both decreased from the maximum level in the first slug of the surfactant fluid and in successive slugs to a minimum level at the last slug of the surfactant fluid.

REFERENCES:
patent: 3266570 (1966-08-01), Gogarty
patent: 3330343 (1967-07-01), Tosch et al.
patent: 3346047 (1967-10-01), Townsend et al.
patent: 3500924 (1970-03-01), Poettmann
patent: 4008769 (1977-02-01), Chang
patent: 4018278 (1977-04-01), Shupe
patent: 4042030 (1977-08-01), Savins et al.
patent: 4066124 (1978-01-01), Carlin et al.
patent: 4099569 (1978-07-01), Bousaid
patent: 4181178 (1980-01-01), Savins

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