水驱含水98%以后采出程度的计算与讨论

Calculation and Discussion on the Recovery Percent after Water Cut Reaching 98% in Water Drive

应用多种方法对大庆主力油田主力油层水驱含水 98%以后的采出程度进行了计算。结果表明 ,含水 98%以后含水上升非常缓慢 ,因而采出程度增加很多 ;水驱含水从 98%到 99%的采出程度平均增加5 36 % ,含水 98%到 10 0 %的采出程度平均增加 16 78%。虽然大庆油田主力油层聚合物驱比水驱提高采收率 10 %～ 12 % ,三元复合驱比水驱提高采收率 2 0 % ,但聚合物驱在油田应用中不可能提高驱油效率 ,而三元复合驱提高驱油效率也不超过 5 %。

Various methods are used to calculate the recovery percent after water cut reaching 98% in water drive of major reservoirs in major oilfields in Daqing. The result shows that water cut increases slowly after it is in the range of 98%, while recovery percent increases very much. The it increases 5.36% in average as water cut is in the range of 98% to 99%, it increases 16.78% in average as water cut is in the range of 98% to 100%. Though the oil recovery factor of polymer flooding is raised 10% to 12% more than that of water drive and 20% more by alkali-surfactant -polymer flooding than that of water drive, oil displacement efficiency can not be improved by using polymer flooding in oilfields, it is raised within 5% by using alkali-surfactant-polymer flooding.