Multiple zone oil recovery process employing countercurrent...

Details Multiple zone oil recovery process employing countercurrent... Multiple zone oil recovery process employing countercurrent...

E - Fixed Constructions

21

B

166/39

E21B 43/24 (2006.01)

Patent

CA 1237069

Abstract A method for the recovery of viscous oil from a subterranean, viscous oil-containing formation having a number of overlying permeable oil-bearing strata separated by impervious layers. Steam is injected countercurrently through adjacent oil-bearing strata and oil is produced utilizing spaced-apart injection and production wells provided with separate flow paths. The injection of steam is terminated when steam breakthrough occurs in the next lower layer or when the fluids recovered from that layer reach a predetermined oil:water ratio. Production is continued using pressure drawdown for improved efficiency.

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