| 摘要 |
A process for recovering crude oil from a subterranean formation comprising injecting into the formation a liquid composition consisting essentially of a specific surfactant in an aqueous medium and injecting a gas to urge the composition toward a production well. The surfactant has the general formula RCH2CH=C(R)CH2O(CH2CH2O)mX, wherein R is C3-C8 alkyl, m is an integer from 1 to 10, and X is a sulfonate, sulfate, glyceryl sulfonate, or carboxylate anion neutralized by a sodium, potassium, or ammonium cation.
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