第三相流体对两相驱替行为影响的孔隙尺度研究

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关键词：格子Boltzmann方法；三相流；多相驱替；石油增产 中图分类号：TE312 文献标志码：A DOI：10.11776/j. issn. 1000-4939.2026.02.017 文章编号：1000-4939（2026）02-0430-10 CSTR：32414. 14. cjam. issn. 1000-4939.2026. 02.017

Pore-scale study on the impact a third-phase fluid on the two-phase displacement behavior

LISheng，ZHOU Ronghong，WANGNingning，LIU Haihu （ ， ，China）

Abstract： Multiphase displacement behavior in capillry porous media is a typical flow phenomenon widely encountered in enhanced oil recovery prevention control groundwater pollution.To explore the influence an immiscible third-phase fluidon the two-phase displacement behavior，a threephase latice Boltzmann color-gradient model is applied for the pore-scale investigation the displacement pattern eficiency in both a single capillary a porous medium.Results show that in a single capillary，the displacement eficiency first increases then decreases with increasing the amount the thirdphase fluid. Introducing an appropriate amount the third-phase fluid enhances the stability the displacement front thus promotes the transition from fingering displacement to stable displacement.The stabilizing efect the third-phase fluid is strengthened by either increasing the viscosity ratio the injected fluid to the third-phase fluid or decreasing the capilary number.In a porous medium，the influences the third-phase fluid amount the capillary number show good agreement with those observed in a single capillary.Specifically，the displacement efciency exhibits a first increasing then decreasing variation withthe increase inthe amount the third-phase fluid，while it monotonicallydecreases with the increase in the capillry number.This study notonly enhances theundersting introducing a third-phase fluid to regulate the two-phase displacement behavior，but also provides theoretical reference for optimizing industrial applications related to multiphase displacement，such as the extraction methods crude oil.

Key words：lattice Boltzmann method；three-phase flow；multiphase displacement；enhanced oil recovery

多孔介质内多相流体渗流现象广泛存在于环境、石油、地质等领域，是地下水污染防治、提高石油采收率等实际工程应用中的典型流动问题[1-3]。（剩余16813字）