Viscous oil recovery method

Details Viscous oil recovery method Viscous oil recovery method

E - Fixed Constructions

21

B

166/39

E21B 43/24 (2006.01)

Patent

CA 1210687

VISCOUS OIL RECOVERY METHOD ABSTRACT A subterranean, viscous oil-containing formation is penetrated by at least one injection well extending to the lower portion thereof. The lower portion of the injection well is characterized by terminating in a cavity in the formation, terminating horizontally or extending through and being in fluid communication with a horizontal fracture through the formation. At least one spaced-apart production well penetrates the formation in fluid communication with the upper two-thirds or less of the formation. A slug of steam is injected into the injection well and fluids including oil are recovered from the formation via the production well. The injection well is then shut-in for a predetermined period of time while continuing production of oil. Thereafter, a predetermined amount of hot water or low quality steam is injected through the injection well and production is continued until there is an unfavorable amount of water or steam in the fluids recovered.

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