长期冲刷条件下的渗透率变化和微观模型研究

Permeability changes under long-term water flooding and microscopic model study

长期的注水开发,使储层的物性参数发生了较大变化,其非均质性较开发初期更加严重,开采难度增加。为了研究长期注水冲刷条件下储层物性参数的变化规律,利用室内岩心驱替实验,分析了在长期冲刷条件下岩心渗透率的变化。实验表明,在长期的注水、注白油驱替下,岩心渗透率降低。根据实验数据,建立了渗透率降低的微观动态模型,并对渗透率降低的原因进行了分析。

Reservoir petrophysical properties would change under long term water flooding,and reservoir heterogeneity would become even worse than the early stage of oilfield development,bringing more difficulties to oil recovery.This paper studies the change of reservoir petrophysical properties under long term water flooding through laboratory core displacement experiments.The results indicate that core permeability decreases after long term water injection or white oil injection.A microscopic dynamic model has been established based on experiment data to analyze the reasons for permeability decrease.