基于微流控和分子模拟的CO 2多相体系微观运移/传质及碳封存特征

钱程; 芮振华; 刘月亮; 周凯虎; 都凯; 赵阳; 邹积瑞

doi:10.3969/j.issn.1673-5005.2026.04.025

中国石油大学学报（自然科学版） ›› 2026, Vol. 50 ›› Issue (4) : 262 -272. DOI: 10.3969/j.issn.1673-5005.2026.04.025

地质能源开采工程

基于微流控和分子模拟的CO ₂多相体系微观运移/传质及碳封存特征

钱程 ¹^,²^,³ ,
芮振华 ¹^,²^,³^,⁴ ,
刘月亮 ¹^,²^,³ ,
周凯虎 ¹^,²^,³ ,
都凯 ¹^,²^,³ ,
赵阳 ¹^,²^,³ ,
邹积瑞 ¹^,²

作者信息 +

Microscopic flow-mass transfer behavior and carbon storage characteristics of CO ₂ multiphase system by microfluidics and molecular simulation

Cheng QIAN ¹^,²^,³ ,
Zhenhua RUI ¹^,²^,³^,⁴ ,
Yueliang LIU ¹^,²^,³ ,
Kaihu ZHOU ¹^,²^,³ ,
Kai DU ¹^,²^,³ ,
Yang ZHAO ¹^,²^,³ ,
Jirui ZOU ¹^,²

Author information +

文章历史 +

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摘要

针对储层条件下CO₂多相体系微观运移与传质行为复杂的问题,基于微流控实验和分子动力学模拟考察CO₂-油-水多相体系在微-纳米尺度上的微观运移及动态传质过程,明确运移/传质过程中溶解和扩散作用及相互作用能的影响。结果表明:水驱后残余油在模型两侧呈大片块状分布,在主流道附近以膜状、柱状及小块状分布;CO₂可通过膨胀、溶解和携带作用动用孔隙中的残余油;增加压力能提高CO₂对油相的驱替效率、CO₂封存量和封存效率;微观孔隙中CO₂占比随压力和孔径增加而上升,在15 MPa时孔径大于100 μm的孔隙分布占比最高达到96%,大孔区域是CO₂封存的主要场所;CO₂与油/水相之间的溶解和扩散传质随压力增加而增强,CO₂与油相之间的相互作用能强于CO₂与水相,前者主要是范德华能,静电能较少;CO₂-水相体系中静电能为主,CO₂与油相更强的相互作用使两者的相互溶解和扩散传质更剧烈。

Abstract

To address the complex migration and mass transfer behavior of CO ₂ multiphase flow under reservoir conditions, the microscopic migration and dynamic mass transfer processes of CO ₂-oil-water multiphase systems at micro-nano scales were investigated using microfluidic experiments and molecular dynamics simulations in this study, and the effects of dissolution, diffusion and interaction energy during the migration/mass transfer process were clarified. The results demonstrate that the residual oil after water injection is distributed in large blocks on both sides of the model, and in forms of film, column and small blocks existed near the main flow channel. CO ₂ can mobilize the residual oil through expansion, dissolution and carrying effects. Increasing pressure can enhance CO ₂ displacement efficiency, storage capacity and storage efficiency. The proportion of CO ₂ within microscopic pores increases with pressure and pore size, reaching a maximum distribution ratio of 96% within pore ranges exceeding 100 μm at 15 MPa. This indicates that macropore regions are the primary sites for storage of the injected CO ₂. Furthermore, the experimental data verify that the dissolution and diffusion-driven mass transfer between CO ₂ and oil/water phases can be intensified with increasing pressure. The interaction energy between CO ₂ and the oil phase is stronger than that between CO ₂ and the water phase, with van der Waals energy dominating in the former and electrostatic energy prevailing in the latter. The stronger interaction between CO ₂ and the oil phase results in more vigorous mutual dissolution and diffusion-driven mass transfer.

关键词

CO ₂驱油与封存 / 微观运移 / 传质过程 / 微流控实验 / 分子动力学模拟

Key words

CO ₂ displacement and storage / microscopic flow behavior / mass transfer / microfluidic experiments / molecular dynamic simulation

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钱程,芮振华,刘月亮,周凯虎,都凯,赵阳,邹积瑞. 基于微流控和分子模拟的CO ₂多相体系微观运移/传质及碳封存特征[J]. 中国石油大学学报（自然科学版）, 2026, 50(4): 262-272 DOI:10.3969/j.issn.1673-5005.2026.04.025

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