Recovering oil by injecting hot co.sub.2 into a reservoir...

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

E - Fixed Constructions

21

B

166/32

E21B 43/22 (2006.01) E21B 43/16 (2006.01) E21B 43/18 (2006.01) E21B 43/24 (2006.01)

Patent

CA 1258619

RECOVERING OIL BY INJECTING HOT CO2 INTO A RESERVOIR CONTAINING SWELLING CLAY Abstract of the Disclosure In a heavy oil reservoir containing water-sensitive clay which impedes injections of either steam or cold CO2, oil is produced by in- jecting CO2 vapor at more than about 130°F at a pressure below the critical pressure for the CO2 or fracturing pressure for the reservoir.

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