基于毛细管的水驱剩余油模型

Remaining oil model of water flooding base on capillary

目的利用推导出的毛细管内界面移动公式,定性、定量地解释并联毛细管水驱油过程中剩余油的分布。方法将毛管力引入达西定律,考虑润湿性和毛管力的影响,推导界面在毛细管中移动的模式,以建立毛细管尺度下的剩余油模型。结果建立了基于毛细管的水驱剩余油模型,该模型不受毛细管表面粗糙和流态的影响,拓宽了传统"Pojseuille"方程的适用范围。结论在并联毛细管模型中,剩余油的分布和数量主要由界面通过毛管的平均速度决定,同时受平均流动速度慢的毛细管出口端毛细管半径的影响。

Aim By using the deduced formula of mobile interface in capillary it is to explain qualitatively and quantitatively the distribution of remaining oil Jin the process of water flooding oil in parallell connection capillaries. Methods Capillary force is applied to Darcy law, the wetting and capillary are considered to derive the model of interface movement in the capillary, which help build remaining oil model in the capillary scale. Results The remaining oil model of water flooding base on capillary is built, which is not affected by surface roughening of capillary and flow pattern; this expands Poiseuille equation. Conclusion In parallell connection capillary model, the distribution of residual quantity of remaining oil mainly is controlled by the average speed of interface through the capillary and affected by the radius of capillary outlet when average flow velocity is slow.