压力系数对于任何具体的天然水驱油(气)藏不是一个常数。
The pressure factor is not a constant for given natural water drive reservoir.
实验结果表明，M驱油剂可大幅度提高水驱原油采收率。
The experimental results show that the displacing agent m can greatly enhance oil recovery.
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.
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.
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