Method of recovering viscous oil from reservoirs with multiple horizontal zones
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United States of America Patent
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Aug 30, 1988
Grant Date -
N/A
app pub date -
Jan 12, 1987
filing date -
Jan 12, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed a method of recovering viscous oil from a subterranean viscous oil-containing formation separated into at least one upper and at least one lower zone by a horizontal layer having lower vertical permeability than the rest of the reservoir. The method comprises injecting steam into the lower zone until steam breakthrough occurs at the production well; subsequently injecting steam into both the upper and the lower zones; and, continuing to inject steam into both zones and recovering fluids, including oil from the production well.
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