Carbon dioxide injection with in situ combustion process for...

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E - Fixed Constructions

21

B

166/36

E21B 43/243 (2006.01)

Patent

CA 1259564

CARBON DIOXIDE INJECTION WITH IN SITU COMBUSTION PROCESS FOR HEAVY OILS ABSTRACT The invention process is a method of conducting in situ combustion in heavy oil or tar sand reservoirs wherein carbon dioxide is injected into the formation prior to, during, or prior to and during in situ combustion. The carbon dioxide may be in- jected concurrently with the injection of the oxygen-containing gas or the oxygen-containing gas and carbon dioxide may be in- jected in alternate slugs. The injection of carbon dioxide aids in situ combustion by lowering the viscosity of the oil, creating channels in the heavy oil deposits for the passage of the oxy- gen-containing gas and increasing the mobility of oil ahead of the combustion front. -21-

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