低碳化学与化工2026，Vol.51Issue(6)：79-86,8.DOI:10.12434/j.issn.2097-2547.20250253
纳米限域对页岩油-CO2体系相行为的影响
Effect of nano-confinement on phase behaviors of shale oil-CO2 systems
摘要
Abstract
Studying the phase behavior of the oil-CO2 system is crucial for efficient shale oil and gas recovery.Considering the effects of capillary pressure and the shift of fluid critical points,a vapor-liquid equilibrium(VLE)model incorporating nano-confinement effects was developed,achieving a prediction relative error of less than or equal to 1.53%.On this basis,the phase behavior of CO2-shale oil systems was investigated using Eagle Ford and Wolfcamp shale oils as examples.The results indicate that the presence of nano-confinement suppresses the bubble-point pressure and delays gas liberation from the liquid phase,resulting in a lower gas-oil ratio,which is favorable for shale oil production.Under nano-confinement,the reduced gas-liquid density difference leads to a decrease in gas-liquid interfacial tension.Smaller pore radius of reservoir correspond to stronger nano-confinement effects and a greater tendency for CO2 and oil to become miscible.As the pore radius decreases,the gas-liquid interfacial tension first decreases slowly and then rapidly,with a pore radius of 20 nm identified as the turning point.In contrast,the capillary pressure first increases and then decreases,with the turning point occurring at a pore radius of 5 nm.This study can provide a reference for optimizing CO2 injection strategies and enhancing shale oil recovery.关键词
纳米限域效应/相行为/页岩油/气液平衡/气液界面张力Key words
nano-confinement effect/phase behavior/shale oil/vapor-liquid equilibrium/gas-liquid interfacial tension分类
能源科技引用本文复制引用
陈影影,杨付林,陈雄..纳米限域对页岩油-CO2体系相行为的影响[J].低碳化学与化工,2026,51(6):79-86,8.基金项目
国家自然科学基金(地区)项目(22268001) （地区）
广西自然科学基金面上项目(2018JJA120001). （2018JJA120001）
