Method of recovering viscous oil from reservoirs with multiple horizontal zones
Patent
·
OSTI ID:6668340
A method is described of recovering viscous oil from a viscous oil-containing formation separated, by at least one horizontal layer having vertical permeability of at least about 1 md, into at least one upper zone and at least one lower zone, the formation being penetrated by at least one injection well and at least one spaced-apart production well, comprising the consecutive steps of: (1) injecting through the injection well steam only into the lower zone until steam breakthrough occurs at the production well; (2) thereafter injecting steam into both, the upper and the lower zones; and (3) continuously injecting steam into the upper and the lower zones and recovering fluids, including oil, from the production well.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4766958
- OSTI ID:
- 6668340
- Country of Publication:
- United States
- Language:
- English
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