RECOVERING OIL BY INJECTING HOT CO.SUB.2 INTO A RESERVOIR CONTAINING SWELLING CLAY

摘要

RECOVERING OIL BY INJECTING HOT CO2 INTOA RESERVOIR CONTAINING SWELLING CLAYAbstract of the DisclosureIn a heavy oil reservoir containing water-sensitive clay whichimpedes 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 criticalpressure for the CO2 or fracturing pressure for the reservoir.