Effect of nano-confinement on phase behaviors of shale oil-CO<sub>2</sub> systems

CHEN Yingying; YANG Fulin; CHEN Xiong

doi:10.12434/j.issn.2097-2547.20250253

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Effect of nano-confinement on phase behaviors of shale oil-CO₂ systems

更新时间：2026-06-25

- Effect of nano-confinement on phase behaviors of shale oil-CO₂ systems
- Vol. 51, Issue 6, Pages: 79-86(2026)
- 作者机构：
  
  1.北部湾大学广西绿色化工新材料与安全技术重点实验室，广西钦州 535011
  2.北部湾大学石油与化工学院，广西钦州 535011
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20250253
  CLC： TE135;TE37
- Received：30 May 2025，
  
  Revised：2025-07-10，
  
  Published：25 June 2026
- 稿件说明：
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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. DOI: 10.12434/j.issn.2097-2547.20250253.

CHEN Yingying,YANG Fulin,CHEN Xiong.Effect of nano-confinement on phase behaviors of shale oil-CO₂ systems[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(6):79-86. DOI: 10.12434/j.issn.2097-2547.20250253.
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. DOI: 10.12434/j.issn.2097-2547.20250253. DOI：

CHEN Yingying,YANG Fulin,CHEN Xiong.Effect of nano-confinement on phase behaviors of shale oil-CO₂ systems[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(6):79-86. DOI: 10.12434/j.issn.2097-2547.20250253. DOI：

摘要

研究页岩油藏油-CO

体系相行为，对于页岩油气高效开采至关重要。基于毛细管压力和流体临界点偏移的影响，构建了考虑纳米限域效应的气液平衡（VLE）模型，预测相对误差小于等于1.53%。在此基础上，以Eagle Ford和Wolfcamp页岩油为研究对象，开展了页岩油-CO

体系相行为研究。结果表明，由于存在纳米限域效应，抑制了泡点压力，延缓了气体从液相分离，导致较低的气油比，从而有助于页岩油开采。纳米限域效应下，气-液相密度差变小，导致气液界面张力减小。储层孔隙半径越小，纳米限域效应越显著，CO

与油越易发生混相。随着孔隙半径减小，气液界面张力首先缓慢减小，然后快速减小，其中孔隙半径20 nm为该过程转折点；而毛细管压力先升后降，其中孔隙半径5 nm为该过程转折点。本研究可为优化CO

注入策略及提高页岩油采收率提供参考。

Abstract

Studying the phase behavior of the oil-CO

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 CO

-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 CO

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 CO

injection strategies and enhancing shale oil recovery.

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Effect of nano-confinement on phase behaviors of shale oil-CO2 systems

DOI：10.12434/j.issn.2097-2547.20250253

摘要

Abstract

关键词

Keywords

references

Effect of nano-confinement on phase behaviors of shale oil-CO₂ systems