In situ combustion process for multi-stratum reservoirs

Details In situ combustion process for multi-stratum reservoirs In situ combustion process for multi-stratum reservoirs

E - Fixed Constructions

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B

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E21B 43/24 (2006.01) E21B 43/243 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1040529

IN SITU COMBUSTION PROCESS FOR MULTI-STRATUM RESERVOIRS Abstract In a combustion process for recovering hydro- carbons from a subterranean hydrocarbon-bearing formation comprising an upper permeable hydrocarbon-bearing stratum overlying a lower permeable hydrocarbon-bearing stratum and separated therefrom by a semi-permeable stratum which is substantially permeable to oxygen but not substantially permeable to water; the strata are traversed by injection and production wells, the lower hydrocarbon-bearing stratum is ignited near an injection well and oxygen-containing gas is injected into the lower hydrocarbon-bearing strata to combust hydrocarbons near the injection well and form a combustion front, an oxygen-containing gas is injected into the lower hydrocarbon-bearing stratum and an aqueous fluid is injected into the upper hydrocarbon-bearing stratum to move the combustion front between the injection and the production wells and to prevent or mitigate channeling through the upper hydrocarbon-bearing stratum, and hydro- carbons are recovered from the strata.

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