E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/33
E21B 43/20 (2006.01) E21B 43/12 (2006.01) E21B 43/16 (2006.01) E21B 43/24 (2006.01)
Patent
CA 1089355
VISCOUS OIL RECOVERY METHOD (D#73,500-RCA-35-F) ABSTRACT OF THE DISCLOSURE Viscous petroleum may be recovered from viscous petroleum-containing formations such as tar sand deposits in a process employing a cyclical injection-production program in which first steam is injected and fluids are produced without restriction until live steam production occurs at the production well, followed by steam injection with production throttled until the formation pressure at the production well rises to a value between about 60% to 95% of the steam injection pressure, after which fluid production is permitted without restriction and steam injection is reduced to 50% or less of the original injec- tion rate. The process should be applied to a viscous petroleum formation in which adequate communication exist or in which a communication path is first established. Optimum results are obtained if the pressurization and drawdown cycles are initiated shortly after the beginning of the steam injection program, and the benefits include substantially increased oil recovery efficiency at all values of steam pore volumes injected.
312041
Gowling Lafleur Henderson Llp
Texaco Canada Inc.
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