Method for inhibition of carbonate dissolution in the recovery o

Details Method for inhibition of carbonate dissolution in the recovery o Method for inhibition of carbonate dissolution in the recovery o

1982-05-26

1983-10-18

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166274, E21B 4322

Patent

active

044100434

ABSTRACT:
Recovery of oil in a subterranean oil-bearing formation comprising injecting a slug of an aqueous solution containing a water-soluble salt comprising sodium oxalate or sodium fluoride, injecting a slug of CO.sub.2 and injecting a driving fluid to displace the oil toward a production well for recovery. The water-soluble salt forms an insoluble precipitate with calcium ions in the formation and preserves more of the injected CO.sub.2 for oil displacement including preventing undesirable changes in formation permeability.

REFERENCES:
patent: 2875833 (1959-03-01), Martin
patent: 3025911 (1962-03-01), Bergman
patent: 3414053 (1968-12-01), Treiber et al.
patent: 3921714 (1975-11-01), Foster
patent: 4074755 (1978-02-01), Hill et al.
patent: 4359093 (1982-11-01), Bernard
Ostroff, "Compatibility of Waters for Secondary Recovery", Producers Monthly, Mar. 1963, pp. 2-9.
Stalkup, "Carbon Dioxide Miscible Flooding: Past, Present, and Outlook for the Future", Journal of Petroleum Technology, Aug. 1978, pp. 1102-1112.

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