后续水驱阶段采收率提高值为4.21%，增油效果显著。
Thus recovery rate is increased by 4.21%, which has an obvious effect.
大庆油田研制的三元、二元、一元驱现场试验证实采收率提高值均达到20％以上。
The incremental recovery of the pilot test in Daqing oilfield by ASP flooding, binary system flooding and mono-system flooding is more than 20% ( OOIP).
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