Lowering CO.sub.2 MMP and recovering oil using carbon dioxide

Details Lowering CO.sub.2 MMP and recovering oil using carbon dioxide Lowering CO.sub.2 MMP and recovering oil using carbon dioxide

1984-02-03

1985-04-30

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166302, E21B 4316, E21B 4320

Patent

active

045138214

ABSTRACT:
Oil is recovered by a CO.sub.2 miscible oil recovery method in which the CO.sub.2 minimum miscibility pressure of the oil-containing formation is lowered by injecting a coolant into the formation. The formation is then pressurized to a pressure at least that of the reduced CO.sub.2 minimum miscibility pressure by injecting a fluid therein. A slug of carbon dioxide is then injected into the formation at the formation pressure whereby the carbon dioxide is miscible with the formation oil and thereafter a driving agent is injected to displace the formation oil and carbon dioxide toward a production well from which oil is produced.

REFERENCES:
patent: 3586107 (1971-06-01), Parrish
patent: 3811502 (1974-05-01), Burnett
patent: 4224992 (1980-09-01), Comberiarti et al.
patent: 4249607 (1981-02-01), Allen
patent: 4250965 (1981-02-01), Wiseman, Jr.
Yellig, W. F., Metcalfe, R. S., "Determination and Prediction of CO.sub.2 MMP", J. Pet. Tech., (1980), vol. 32, pp. 160-168.
Stalkup, F. I., "CO.sub.2 Miscible Flooding: Past, Present and Outlook for the Future", J. Pet. Tech., (Aug. 1978), pp. 1102-1112.
Miscible Displacement, by Fred I. Stalkup, Jr., Society of Petroleum Engineers, 1983.
Effects of Impurities on Minimum Miscibility Pressures and Minimum Enrichment Levels for CO.sub.2 and Rich-Gas Displacements, by R. S. Metcalfe, SPE, Amoco Production Co.

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