| 摘要 |
Disclosed is a method for recovering viscous oil from subterranean, viscous oil containing formations, particularly from shallow formations which overlie water zones. An injection well is completed in the lower part of the oil formation and an equivalent amount in the water zone immediately therebelow, and the production well is completed in the entire oil zone and small amount in the water zone. Heated air is injected into the formation, the air channeling through the upperpart of the water zone and causing an in situ combustion reaction to occur at the oil water contact. Air injection and in situ combustion in the oil water contact heat the oil above by conduction as well as hot gas convection through the oil saturated interval. The injection well is then completed in the upper portion of the formation and the section in the water zone is closed as by cementing, and then steam is injected into the oil saturated interval.
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