| 摘要 |
Petroleum may be recovered from subterranean formation in an enhanced oil recovery process by utilizing an aqueous surfactant slug comprising a mixture of a sulfonate of a gas oil which has been obtained from the thermal cracking of coal, a lower alkyl alcohol containing from about 3 to about 6 carbon atoms and a non-ionic surfactant comprising an ethoxylated alcohol containing from about 12 to about 15 carbon atoms. The surfactant slug will be present in an amount sufficient to reduce the interfacial tension between the petroleum and water, thus enabling the petroleum to be recovered in an increased amount.
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