Foam drive method
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United States of America Patent
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-
Aug 27, 2002
Grant Date -
N/A
app pub date -
Dec 5, 2000
filing date -
Apr 6, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A foam drive method for enhancing oil recovery efficiently is initiated by injecting into a subterranean oil-bearing formation, an aqueous polymer solution as a preceding-slug. This is followed by periodically injecting simultaneously or alternately a non-condensible gas and an aqueous solution of foaming composition to form a combined foam under ground or periodically injecting the combined foam formed beforehand by the gas and said aqueous solution above ground. The aqueous solution of foaming composition comprises an alkali, a surfactant and a polymer. Thereafter, an aqueous polymer solution used as a protecting-slug is injected into the formation; followed by continuing water-flooding.
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Cited Art Landscape
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