摘要
细颗粒运移广泛存在于自然界与工程领域的两相流动过程中,如污染物运移与修复、油气开采等。然而,颗粒引起的孔隙堵塞对两相渗流特性的影响尚不清楚。基于自主研发的多相渗流三维可视化试验平台,在多孔介质模型中开展了不同流量和孔隙尺寸条件下的两相驱替试验,深入探讨了细颗粒在多孔介质中的运移和堵塞行为及其对两相流动过程的影响。试验结果表明:细颗粒诱导的多孔介质堵塞过程受流量和孔隙尺寸的协同控制,低流量条件下,孔隙尺寸对堵塞的影响可以忽略,而高流量条件下,孔隙尺寸是决定堵塞的主导因素。通过空间团簇体分析,阐明了孔隙堵塞现象与流体连通特性之间的关系,即堵塞越显著,残余湿润相分布越离散,流体连通性越差。此外,试验还揭示了两相流动过程中堵塞对驱替压力以及驱替效率的调控机制,研究成果有望为优化两相流动过程、提高能源开采效率提供重要的理论依据与实践指导。
Fine particle migration widely exists in two-phase flow processes in both nature and engineering fields,such as pollutant migration,remediation,as well as oil and gas production.However,the effects of particle-induced blockage in porous media on two-phase flow remain unclear.Utilizing a self-developed three-dimensional visualization experimental platform,this study conducted a series of two-phase displacement experiments with different flow rates and pore sizes in a porous medium,and systematically investigated the transport and clogging behavior of fine particles and their subsequent effects on two-phase flow dynamics.The results reveal that particle-induced pore clogging during two-phase flow is governed by the synergistic control of flow rate and pore size.At low flow rates,pore size has minimal impact on clogging.However,at high flow rates,pore size becomes the dominant factor.By analyzing the spatial distribution of residual fluids,the study clarified the relationship between pore clogging and fluid connectivity:more significant clogging leads to a more discrete distribution of the residual wetting phase and reduced fluid connectivity.Additionally,the experiment also revealed the controlling mechanism of blockage on displacement pressure and displacement efficiency during two-phase flow.The findings are expected to provide important theoretical insights and practical guidance for optimizing two-phase flow process and improving energy recovery efficiency.
作者
吴婷
杨志兵
胡冉
陈益峰
WU Ting;YANG Zhi-bing;HU Ran;CHEN Yi-feng(State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan,Hubei 430072,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education,Wuhan University,Wuhan,Hubei 430072,China)
出处
《岩土力学》
北大核心
2025年第6期1755-1764,1776,共11页
Rock and Soil Mechanics
基金
国家重点研发计划项目(No.2024YFE0197700)
国家自然科学基金(No.42377066)
湖北省自然科学基金创新群体项目(No.2022CFA028)。
关键词
多孔介质
细颗粒
孔隙堵塞
两相流
连通特性
porous medium
fine particle
pore clogging
two-phase flow
connectivity characteristic
