Enhanced oil recovery process

Details Enhanced oil recovery process Enhanced oil recovery process

1977-03-07

1978-09-12

Guynn, Herbert B.

Wells

Processes

Distinct, separate injection and producing wells

166274, 252 855D, E21B 4322

Patent

active

041130111

ABSTRACT:
An enhanced oil recovery process employing an aqueous alkyl polyethylene oxide sulfate solution and a carbon dioxide displacement fluid at injection pressures above about 1,500 p.s.i. The aqueous solution of an alkyl polyethylene oxide sulfate having 8 or 9 carbon atoms in the alkyl group and between 1 and 5 ethoxy groups significantly improves the areal sweep and overall efficiencies of dense fluid carbon dioxide enhanced oil recovery processes, especially under high salinity and low pH conditions. The efficiency of the process is increased as the injection pressure is increased.

REFERENCES:
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patent: 3330346 (1967-07-01), Jacobs et al.
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patent: 3391750 (1968-07-01), Zika
patent: 3500923 (1970-03-01), Reisberg
patent: 3529668 (1970-09-01), Bernard
patent: 3620304 (1971-11-01), Hearn
patent: 3623552 (1971-11-01), Vairogs
patent: 3653440 (1972-04-01), Reisberg
patent: 3811502 (1974-05-01), Burnett
patent: 3893511 (1975-07-01), Root
Holm et al., Article in Journal of Petroleum Technology, Dec., 1974, pp. 1427-1437.

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