吸水指数随累积注水量变化关系

The relationship between water injectivity index and the cumulative injection

在水驱油过程中,随着累积注水量的不断增加,油相被水相逐渐驱替,靠近注入端的吸水指数也将不断增大,然而目前对这一变化规律尚无完整有效的定量解释方式。此文主要探讨了在水驱油过程中,注入端吸水指数随累积注水量的变化关系。主要以单向流等饱和度面移动方程为基础,以相对渗透率曲线为依据,建立水驱油的单向流模型,分析推导水驱油过程中在定压差生产条件下,小层的吸水指数与小层累积注水量的关系。最后结合油田实际地层参数进行计算分析,为未来水井的合理配注及研究多层合采时不同小层间吸水情况提供理论依据。

In the process of water flooding, along with increase of cumulative water injection, the oil phase displacement by water phase.The water injectivity index close to inject will also continue to increase gradually.However,there is no complete and effective way to explain the rule quantitatively.This article mainly discussed the relationship between the injection side water injectivity index and the cumulative injection.Mainly on the basis of Buckley-leverett equation and the relative permeability curve,establish uniflow model of water flooding,analy- sised the relationship between the water injectivity index and the cumulative injection in small layer in the process of water flooding.At last,the calculation and analysis combined with oil field actual formation parameters,it povides theoretical basis for the future reasonable injection allocation of injection wells and the study of different small interlayer water absorp- tion for multilayer commingled production.