Pore-scale modeling of multiple fluids flow transport kinetics for CO2 enhanced gas recovery

Xinyuan Gao, Shenglai Yang, Beidong Wang, Yiqi Zhang, Jiangtao Hu, Mengyu Wang, Bin Shen and Ermeng Zhao

Energy, 2025, vol. 315, issue C

Abstract: Carbon storage with enhanced gas recovery (CSEGR) is a promising technology in the era of energy transition. The changes in the gas-liquid interface and the miscibility of fluids in the CO2-CH4-brine system are the key and difficult issues of mutual coupling. Therefore, this study develops a fully coupled multiphase flow and mass transfer model that considers both convective and diffusive interactions between gases while simulating the gas-liquid interface. This model explores the multiphase flow and diffusion characteristics of various fluids at the pore scale. Additionally, the study examines the profound impacts of pore pressure and wettability. The findings are as follows: The high density and viscosity of CO2 causes it to flow in the center of the dominant channels, while CH4 and water prefer to be distributed along the pore walls. At lower pore pressures, diffusion becomes a key factor in interphase gas exchange. As pressure increases, the effect of convection exceeds that of diffusion, resulting in a more dynamic mixing of CO2 and CH4. For highly hydrophilic reservoirs, water film will hinder the flow of CO2 and cause gas retention. Moderately hydrophilic reservoirs provide the best conditions for CO2 displacement while reducing gas mixing. Weakly hydrophilic reservoirs have minimal water resistance, which is conducive to CO2 displacement, but will lead to sufficient mixing between CO2 and CH4. This study aims to elucidate the interactions among various fluids and the impact of pore structures on flow behavior through numerical simulation, thereby offering a more comprehensive scientific basis for optimizing design.

Keywords: CCUS; CO2 storage with enhanced gas recovery; Convection-diffusion coupling; Clean energy mining; Phase field (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544225001288
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:315:y:2025:i:c:s0360544225001288

DOI: 10.1016/j.energy.2025.134486

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().