Abstract The theory of “secondary-tertiary integrated” enhanced oil recovery (EOR) was investigated. Models and methods for estimating the secondary water-flooding recovery, tertiary chemical-flooding recovery and “secondary-tertiary integrated” EOR were established, respectively. The results indicate that the ultimate recovery factor of “secondary-tertiary integrated” EOR is greater than the aggregation of the secondary recovery factor and the tertiary recovery factor when the secondary recovery and the tertiary recovery are implemented alone. The excess recovery is attributed to the product of the increased volumetric water-flooding sweep efficiency and the difference between the oil displacement efficiencies before and after the displacing medium is changed.

中文翻译：

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“二三级一体化”提高采收率估算方法及启示

摘要 研究了“二三次一体化”提高采收率（EOR）理论。分别建立了二次注水采收率、三次化学驱采收率和“二次三次一体化”提高采收率的估算模型和方法。结果表明，当单独实施二次采收和三次采收时，“二三次一体化”EOR的最终采收率大于二次采收率和三次采收率之和。超采率归因于体积水驱波及效率的增加与驱油介质改变前后的驱油效率差异的乘积。