| 摘要 |
A waterflood oil recovery process, in which a surfactant system (comprising an aqueous, oil or two-phase liquid solution or dispersion of a mixture of petroleum sulfonate and alkoxylated alcohol sulfate surfactants) is injected into a reservoir to displace oil, is improved by using a sulfate surfactant that contains at least one chain-branching substituent on a carbon atom alpha or beta to the sulfate group. In a reservoir that is relatively hot, the improved process provides good oil-displacement efficiency and polyvalent metal ion compatibility in addition to improved stability towards hydrolytic decomposition of the sulfate surfactant.
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