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Modeling of multiphase flow in low permeability porous media:Effect of wettability and pore structure properties

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Multiphase flow in low permeability porous media is involved in numerous energy and environmental applications.However,a complete description of this process is challenging due to the limited modeling scale and the effects of complex pore structures and wettability.To address this issue,based on the digital rock of low permeability sandstone,a direct numerical simulation is performed considering the interphase drag and boundary slip to clarify the microscopic water-oil displacement process.In addition,a dual-porosity pore network model(PNM)is constructed to obtain the water-oil relative permeability of the sample.The displacement efficiency as a recovery process is assessed under different wetting and pore structure properties.Results show that microscopic displacement mechanisms explain the corre-sponding macroscopic relative permeability.The injected water breaks through the outlet earlier with a large mass flow,while thick oil films exist in rough hydrophobic surfaces and poorly connected pores.The variation of water-oil relative permeability is significant,and residual oil saturation is high in the oil-wet system.The flooding is extensive,and the residual oil is trapped in complex pore networks for hydrophilic pore surfaces;thus,water relative permeability is lower in the water-wet system.While the displacement efficiency is the worst in mixed-wetting systems for poor water connectivity.Micropo-rosity negatively correlates with invading oil volume fraction due to strong capillary resistance,and a large microporosity corresponds to low residual oil saturation.This work provides insights into the water-oil flow from different modeling perspectives and helps to optimize the development plan for enhanced recovery.

Low permeability porous mediaWater-oil flowWettabilityPore structuresDual porosity pore network model(PNM)Free surface model

Xiangjie Qin、Yuxuan Xia、Juncheng Qiao、Jiaheng Chen、Jianhui Zeng、Jianchao Cai

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

Research Institute of Petroleum Exploration and Development,Beijing,10083,China

National Natural Science Foundation of ChinaScience Foundation of China University of Petroleum,Beijing

421721592462023XKBH002

2024

10.1016/j.jrmge.2023.06.007

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(4)
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