Reverse combustion actually refers to dry reverse combustion and can be used to recover extremely viscous oil or tar. In reverse combustion, the liquid blocking problem is solved because a hot zone is maintained near the production well. Despite this advantage, this process is not as efficient as dry forward combustion because lighter fractions of the oil are burned and heavier fractions are left behind the burning front. Another drawback is the possibility of a spontaneous ignition in the injector well, which will divert air for combustion near the injector well instead of near the producer.
Reverse combustion, sometimes called “in situ combustion”, is a form of oil recovery that uses heat to reduce viscosity of oil so it moves easily to the production wells.
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