The impact of porous structure on oil–water two-phase flow under CO2 environment in continental shale reservoirs

油页岩 相对渗透率 溶解 致密油 磁导率 多孔性 石油工程 表面张力 提高采收率 地质学 矿物学 化学工程 岩土工程 化学 物理 古生物学 生物化学 量子力学 工程类
作者
Yufan Meng,Zhaojie Song,Yilei Song,Yunfei Zhang
出处
期刊:Physics of Fluids [American Institute of Physics]
卷期号:36 (6) 被引量:1
标识
DOI:10.1063/5.0209271
摘要

CO2 applications for enhanced oil recovery and storage in continental shale reservoirs are promising, and there is a need to evaluate the impact of porous structure on oil–water two-phase flow under CO2 environment. In this study, first, digital cores of quartz-rich, carbonate-rich, and clay-rich shales are established using Focused Ion Beam Scanning Electron Microscopy scanning data processed through generative adversarial networks. Subsequently, the pore networks generated by digital cores are quantitatively analyzed using the generalized extreme value distribution. Finally, pore network modeling is carried out to elucidate the effect of porous structural differences on oil–water flow considering CO2 dissolution and capillary forces. The results show that quartz-rich shale, characterized by nanopore intergranular dominance and the highest pore network connectivity, demonstrates the highest relative permeability of the oil phase. Carbonate-rich shale exhibits intermediate relative permeability of oil phase, while clay-rich shale exhibits the worst. The dissolution of CO2 reduces oil–water interfacial tension and oil viscosity, enhances oil mobilization within nanopores, and notably increases the relative permeability of the oil phase. The permeability of the oil phase is governed by pore structure, displaying positive correlations with core heterogeneity, pore radius, coordination number, and throat length, and negative correlations with throat radius.
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