毛细管内两相流体驱替规律研究

本文模拟了不同半径毛细管中水驱油和油驱水时界面移动的全部过程,为深入理解液-液两相流动机理,建立正确的两相流流动模型提供一定的依据,探索孔隙内流体驱替速度与外加压差之间的关系。根据实验数据,发现它们之间存在很强的规律性,其流动规律明显偏离泊谡叶公式,依据实验资料,得到的结论是：两相驱替时界面移动的动态接触角余弦与外加压差之间存在线性关系；进而得到动态毛细管压力与外加压差之间的线性关系；两相驱替时,液体的流动规律是,界面的移动速度与外加压差成线性关系,对于水驱油和油驱水时,直线的斜率不同,其截距是静毛细管压力,转变点的压力与静态接触角和直线的斜率有关。

The New Study of Two-phase Fluid Displacement Model

The paper modeled the process of water displacing oil and oil displacing water in simple capillary tubes with different radii , it provided some evidences for deep understanding two-phase immiscible liquid displacement mechanisms , building the two-phase fluid flow model . We try to find the relationship between the liquid-liquid interface velocity and the driving pressure in porous media , they have apparent rate-dependency according our experiment data , but it is deviant from the poiseuille equation . After processing the experiment data , we draw a experimental conclusion : the first is that there is linear relationship between the cosine dynamic contact angle and the driving pressure , secondly the dynamic capillary pressure has linear rate-dependency of the driving pressure , the last and the important is the law of two-phase fluid flow model , the liquid-liquid interface velocity is linear depended on the driving pressure , it has different slope for water displacing oil and oil displacing water , the intersection is static capillary pressure between the tendency line and the velocity line , the pressure of the changing point is related to the slope and static contact angle .