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本文提出准动态驱替的概念以描述岩石内驱替速度介于准静态和动态之间的驱替过程.准动态模型在不同的尺度区别对待黏性力:将表征单元体(REV)尺度的驱替视为动态,而将孔隙尺度的驱替视为准静态.在REV尺度上,提出双重网络简化计算黏性力和毛管力的综合作用;在孔隙尺度上,运用概率方法描述界面在不同孔隙内的运动几率,提高了计算效率.通过与现有的计算和实验结果进行对比验证了模型的正确性,并基于特定岩石微CT扫描图像建立等价孔隙网络,计算分析了岩样内驱替速度、孔隙半径分布和孔隙角落形状对水驱油过程的影响.本文计算模型有利于认识岩石内水油两相驱替的动态全过程.
In this paper, the concept of quasi-dynamic displacement is proposed to describe the displacement process between quasi-static and dynamic in rock.Quasi-dynamic model treats cohesive force at different scales: Displacement is regarded as quasi-static.With REV scale, a dual network is proposed to simplify the calculation of the combined effect of viscous force and capillary force. On the pore scale, the probability method is used to describe the interface between different And the computational efficiency is improved.Compared with the existing calculation and experimental results, the correctness of the model is verified and an equivalent pore network is established based on the micro-CT scanning images of specific rocks. Effect of Substitution Rate, Pore Radius Distribution and Pore Corners Shape on Water Flooding Process The model is helpful to understand the dynamic process of water-oil two-phase displacement in rocks.