| 摘要 |
Crude oil is recovered from a subterranean oil bearing formation by injecting an initial slug of an aqueous flooding medium containing a dissolved polymeric agent into the formation to displace the oil toward at least one output well communicating with the formation and then following the initial slug with a secondary aqueous slug having a dissolved polymer concentration of less than about one-third that of the initial slug but not in excess of 100 p.p.m.
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