Oil recovery process employing CO.sub.2 produced in situ

Details Oil recovery process employing CO.sub.2 produced in situ Oil recovery process employing CO.sub.2 produced in situ

1984-04-09

1985-06-18

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166270, 166300, E21B 4322, E21B 4324

Patent

active

045236429

ABSTRACT:
Recovery of oil from an oil-containing formation is effected by injection of steam followed by a soak period, if desired, and then injecting a mixture of sodium bicarbonate and citric acid that react in the formation to form carbon dioxide in situ. A driving fluid, preferably hot water or low quality steam (less than 20%), is then injected to displace the carbon dioxide and oil toward a production well for recovery. The process may be operated under conditions wherein the carbon dioxide formed in situ is miscible with the formation oil at the pressure and temperature of the formation thereby effecting miscible displacement and enhancing oil recovery.

REFERENCES:
patent: 2813583 (1957-11-01), Marx et al.
patent: 3036632 (1962-05-01), Koch et al.
patent: 3221813 (1963-08-01), Closmann et al.
patent: 3457996 (1969-07-01), Parker
patent: 3731741 (1973-05-01), Palmer et al.
patent: 3853178 (1974-12-01), Shen
patent: 3871452 (1975-03-01), Sarem
patent: 3880237 (1975-04-01), Snavely, Jr. et al.
patent: 4068716 (1978-01-01), Allen
patent: 4156462 (1979-05-01), Allen
patent: 4441555 (1984-04-01), Shu

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