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

本项目的目的是通过结合实验技术，对毛细管滞后压力-饱和度关系中的动态毛细管效应进行定量研究。假设是，动态毛细效应随饱和度、湿/干路径、流体和多孔介质性质而变化，并且这种关系取决于毛细力和粘性力之间的比率对速度变化的响应大小。这一假设将通过直接测量动态毛细管压力系数ô，在整个滞后毛细管压力-饱和度（Pc - S）关系中进行评估。实验将使用定制设计的基于膜的流体选择性孔隙压力微传感器，结合一种快速测量滞后（Pc - S）关系的方法。使用CompSim 3-D多相流模型的协作建模工作将使用实验测量结果来探索大型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.