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Experimental Determination of CO 2 Diffusion Coefficient in a Brine-Saturated Core Simulating Reservoir Condition

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  • Zerong Li

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Lei Yuan

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Guodong Sun

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Junchen Lv

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Yi Zhang

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

Abstract

CO 2 diffusion coefficient plays a crucial part in saline aquifers for the CO 2 storage and the safety of long-term sequestration. Therefore, it is particularly important to measure the diffusion coefficient accurately. As far as we know, there are currently no CO 2 brine diffusion data in real cores under reservoir temperature and pressure conditions. In this paper, a study on the CO 2 diffusion coefficient diffused in a brine-saturated Berea core along the radial direction was conducted at temperatures of 313.15 K to 373.15 K and pressures of 8 MPa to 30 MPa. On account of the experimental results, the effect of permeability, NaCl concentration, temperature and pressure on the CO 2 diffusivity is analyzed. The results in this study indicate that the diffusion coefficient increases with increasing permeability, pressure and temperature and decreases with increasing NaCl concentration. However, the relationship between pressure and the diffusion coefficient is not linear. As the pressure gradually increases, the effect of pressure will become weak. In addition, an empirical correlation of the relationship between temperature–pressure and the CO 2 diffusion coefficient could be obtained based on the experimental data. The data in this paper fill the blank on the study of the CO 2 diffusivity in brine under reservoir conditions, which has positive significance for the study of supercritical CO 2 diffusion in a brine-saturated core.

Suggested Citation

  • Zerong Li & Lei Yuan & Guodong Sun & Junchen Lv & Yi Zhang, 2021. "Experimental Determination of CO 2 Diffusion Coefficient in a Brine-Saturated Core Simulating Reservoir Condition," Energies, MDPI, vol. 14(3), pages 1-12, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:540-:d:484529
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    References listed on IDEAS

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    1. Hirai, S. & Okazaki, K. & Yazawa, H. & Ito, H. & Tabe, Y. & Hijikata, K., 1997. "Measurement of CO2 diffusion coefficient and application of LIF in pressurized water," Energy, Elsevier, vol. 22(2), pages 363-367.
    2. Hu, Haixiang & Li, Xiaochun & Fang, Zhiming & Wei, Ning & Li, Qianshu, 2010. "Small-molecule gas sorption and diffusion in coal: Molecular simulation," Energy, Elsevier, vol. 35(7), pages 2939-2944.
    3. Zhang, Ming & Mu, Hailin & Ning, Yadong & Song, Yongchen, 2009. "Decomposition of energy-related CO2 emission over 1991-2006 in China," Ecological Economics, Elsevier, vol. 68(7), pages 2122-2128, May.
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    1. Guilherme Veludo & Manuel Cunha & Maria Manuel Sá & Carla Oliveira-Silva, 2021. "Offsetting the Impact of CO 2 Emissions Resulting from the Transport of Maiêutica’s Academic Campus Community," Sustainability, MDPI, vol. 13(18), pages 1-11, September.
    2. Eigbe, Patrick A. & Ajayi, Olatunbosun O. & Olakoyejo, Olabode T. & Fadipe, Opeyemi L. & Efe, Steven & Adelaja, Adekunle O., 2023. "A general review of CO2 sequestration in underground geological formations and assessment of depleted hydrocarbon reservoirs in the Niger Delta," Applied Energy, Elsevier, vol. 350(C).

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