A method on evaluation time that water cut fall or rise is given out through analyzing the polymer flooding of single well in Lamadian oilfield.

通过对喇嘛甸油田聚合物驱单井效果分析，给出了采油井阶段效果评价方法，即单井见效时间和含水回升时间早晚的确定方法。

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When the recovery of recoverable reserve is more than 80%, the single well fluid productivity rate will decline, the number of active Wells will reduce as the composite water cut is more than 90%.

可采储量采出程度达80%后，单井日产液、采液速度降低。综合含水达90%后，油井开井数降低。

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And limited water cut of heavy oil reservoir by water flood curve method is studied, establishing the correlation of water cut vs average oil production of single well.

对确定稠油油藏水驱曲线方法的极限含水率进行了研究，建立了含水率与平均单井日产油关系式。

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