In the vertical direction, follow-up water diverted from the high-permeability layer to the low-permeability layer to enhance the vertical sweep efficiency.

在纵向上，后续水从高渗层转向低渗透层，提高纵向波及系数。

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Results show that polymer flooding can improve the producing reserves effectively, extend the plane sweep efficiency, reduce the difference between layers and balance the in-layer vertical producing.

结果表明，聚合物驱可有效地提高油层的动用状况，扩大平面波及系数，减小层间差异，使层内纵向动用更加均匀。

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In particular, discontinuous shales, acting as vertical flow barriers, affect significantly the sweep efficiency of oil reservoirs.

特别是，不连续的页岩，作为垂直的流体流动遮挡，极大影响油罐的洗油效率。

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