METHOD FOR RECOVERING OIL BY IN-SITU COMBUSTION USING OXYGEN

摘要

METHOD FOR RECOVERING OIL BY IN SITU COMBUSTION USING OXYGEN The vertical sweep of an in situ combustion drive process using essentially pure oxygen as the oxidant is improved thereby enhancing oil recovery in a subterranean, permeable, oil-containing formation containing about 20.degree. API oil overlying and in contact with a water zone by injecting the oxygen into only the lower 15% of the oil-containing formation and producing oil in only the upper 70% of the formation.