Recovering oil by injecting hot CO.sub.2 into a reservoir contai

Details Recovering oil by injecting hot CO.sub.2 into a reservoir contai Recovering oil by injecting hot CO.sub.2 into a reservoir contai

1985-02-11

1986-10-07

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166303, E21B 4322

Patent

active

046153926

ABSTRACT:
In a heavy oil reservoir containing water-sensitive clay which impedes injections of either steam or cold CO.sub.2, oil is produced by injecting CO.sub.2 vapor at more than about 130.degree. F. at a pressure below the critical pressure for the CO.sub.2 or fracturing pressure for the reservoir.

REFERENCES:
patent: 3442332 (1969-05-01), Keith
patent: 3480082 (1969-11-01), Gilliland
patent: 4042029 (1977-08-01), Offeringa

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