Dynamic Capillary Effects Throughout the Hysteretic Capillary Pressure-Saturation (Pc-S) Relationship: Fundamental Causes and Dependencies

本项目的目的是利用多种实验技术相结合的方法对滞后毛管压力-饱和关系中的动态毛管效应进行定量研究。假设动态毛管效应随饱和度、湿/干路径、流体和多孔介质性质的不同而不同，并且这些关系取决于毛细和粘性力之比对速度变化的响应的大小。这一假设将通过直接测量滞后毛细管压力-饱和度(Pc-S)关系中的动态毛细管压力系数On来进行评估。实验将利用定制设计的膜基流体选择性孔压微型传感器，以及一种快速测量滞回关系的方法(Pc-S)。使用CompSim三维多相流模型的协作建模工作将使用实验测量的结果来探索大系统中动态效应的潜在影响。

The objective of this project is to conduct a quantitative study of dynamic capillary effects throughout the hysteretic capillary pressure-saturation relationship using a combination of experimental techniques. The hypothesis is that dynamic capillary effects vary with saturation, wetting/drying path, and fluid and porous media properties, and that the relationships are dictated by the magnitude of the response of the ratio between capillary and viscous forces to changing velocity. This hypothesis will be evaluated through direct measurement of the dynamic capillary pressure coefficient, ô, throughout the hysteretic capillary pressure-saturation (Pc - S) relationship. Experiments will make use of custom-designed membrane-based fluid-selective pore pressure micro-sensors, coupled with a method for rapid measurement of hysteretic (Pc - S) relationships. A collaborative modeling effort using the CompSim 3-D multiphase flow model will use the results of experimental measurements to explore the potential impacts of dynamic effects in large-scale systems.