Heavy oil recovery process using cyclic co.sub.2- steam...

Details Heavy oil recovery process using cyclic co.sub.2- steam... Heavy oil recovery process using cyclic co.sub.2- steam...

E - Fixed Constructions

21

B

31/14

E21B 43/22 (2006.01)

Patent

CA 1231520

HEAVY OIL RECOVERY PROCESS USING CYCLIC CARBON DIOXIDE STEAM STIMULATION ABSTRACT A method for the recovery of viscous oil from subterranean formations including tar sands by the injection of a mixture of carbon dioxide and steam into the formation through an injection well, after which formation fluids are recovered from the well in a cyclic manner, using the well alternately for injection and production. Incremental recovery is optimized by maintaining the ratio of carbon dioxide to steam within the range 200 to 300, preferably 230 to 270 SCF carbon dioxide per barrel of steam (with water equivalent) in the injected mixture.

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