首页|Insight into evolution of invasive patterns on fingering phenomenon during immiscible two-phase flow through pore structure

Insight into evolution of invasive patterns on fingering phenomenon during immiscible two-phase flow through pore structure

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Understanding fingering,as a challenge to stable displacement during the immiscible flow,has become a crucial phenomenon for geological carbon sequestration,enhanced oil recovery,and groundwater pro-tection.Typically governed by gravity,viscous and capillary forces,these factors lead invasive fluids to occupy pore space irregularly and incompletely.Previous studies have demonstrated capillary numbers,describing the viscous and capillary forces,to quantificationally induce evolution of invasion patterns.While the evolution mechanisms of invasive patterns have not been deeply elucidated under the con-stant capillary number and three variable parameters including velocity,viscosity,and interfacial tension.Our research employs two horizontal visualization systems and a two-phase laminar flow simulation to investigate the tendency of invasive pattern transition by various parameters at the pore scale.We showed that increasing invasive viscosity or reducing interfacial tension in a homogeneous pore space significantly enhanced sweep efficiency,under constant capillary number.Additionally,in the fingering crossover pattern,the region near the inlet was prone to capillary fingering with multi-directional in-vasion,while the viscous fingering with unidirectional invasion was more susceptible occurred in the region near the outlet.Furthermore,increasing invasive viscosity or decreasing invasive velocity and interfacial tension promoted the extension of viscous fingering from the outlet to the inlet,presenting that the subsequent invasive fluid flows toward the outlet.In the case of invasive trunk along a unidi-rectional path,the invasive flow increased exponentially closer to the outlet,resulting in a significant decrease in the width of the invasive interface.Our work holds promising applications for optimizing invasive patterns in heterogeneous porous media.

Immiscible two-phase flowFingering phenomenonInvasive patternCapillary numberParameters optimization

Yu Li、Hui-Qing Liu、Chao Peng、Peng Jiao、Wai Lam Loh、Qing Wang

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State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing,102249,China

Department of Mechanical Engineering,National University of Singapore,117575,Singapore

State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing 102249,China

Oil and gas production Business Department,Kunlun Shuzhi Technology Co.,LTD,Beijing,100040,China

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2024

10.1016/j.petsci.2024.05.009

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(5)