The polymer flooding has higher oil displacement efficiency than the water flooding.

聚合物驱较水驱有更高的微观驱油效率.

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The structural fractures in fractured low permeability sandstone reservoirs have great effect on displacement efficiency.

裂缝性低渗透砂岩油层中的构造裂缝对驱油效率有明显影响.

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Gas injection into fractured reservoirs can maintain the formation pressure and improve the displacement efficiency.

注气可以维持裂缝性储层的地层压力,并提高驱油效率.

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Rotating casing is helpful to improve effectively mud displacement efficiency and thus improve cementing quality.

旋转套管可以有效提高水泥浆顶替效率,从而提高固井质量.

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When the wettability is neutrally and slightly water wet, the displacement efficiency is maximal.

润湿性为中性或弱水湿时, 微观驱替效率达到最大.

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