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Experimental Investigation of the Impact of CO 2 Injection Strategies on Rock Wettability Alteration for CCS Applications

Author

Listed:
  • Stella I. Eyitayo

    (Bob L. Herd Department of Petroleum Engineering, Texas Tech University, 807 Boston Avenue, Lubbock, TX 79409, USA)

  • Gamadi Talal

    (Bob L. Herd Department of Petroleum Engineering, Texas Tech University, 807 Boston Avenue, Lubbock, TX 79409, USA)

  • Oladoyin Kolawole

    (John A. Reif, Jr. Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA)

  • Chinedu J. Okere

    (Bob L. Herd Department of Petroleum Engineering, Texas Tech University, 807 Boston Avenue, Lubbock, TX 79409, USA)

  • Ion Ispas

    (Bob L. Herd Department of Petroleum Engineering, Texas Tech University, 807 Boston Avenue, Lubbock, TX 79409, USA)

  • Nachiket Arbad

    (Bob L. Herd Department of Petroleum Engineering, Texas Tech University, 807 Boston Avenue, Lubbock, TX 79409, USA)

  • Hossein Emadibaladehi

    (Bob L. Herd Department of Petroleum Engineering, Texas Tech University, 807 Boston Avenue, Lubbock, TX 79409, USA)

  • Marshall C. Watson

    (Bob L. Herd Department of Petroleum Engineering, Texas Tech University, 807 Boston Avenue, Lubbock, TX 79409, USA)

Abstract

Carbon capture and storage (CCS) has been recognized as a pivotal technology for mitigating climate change by reducing CO 2 emissions. Storing CO 2 in deep saline aquifers requires preserving the water-wet nature of the formation throughout the storage period, which is crucial for maintaining rock integrity and storage efficiency. However, the wettability of formations can change upon exposure to supercritical CO 2 (scCO 2 ), potentially compromising storage efficiency. Despite extensive studies on various factors influencing wettability alteration, a significant research gap remains in understanding the effects of different CO 2 injection strategies on wettability in deep saline formations (DSFs). This study addresses this gap by investigating how three distinct CO 2 injection strategies—continuous scCO 2 injection (CCI), water alternating with scCO 2 injection (WAG), and simultaneous water and scCO 2 injection (SAI)—affect the wettability of gray Berea sandstone and Indiana limestone, both selected for their homogeneous properties relevant to CCS. Using a standardized sessile drop contact angle method before and after CO 2 injection, along with core flooding to model the injection process at an injection pressure of 1500 psi and temperature of 100 °F with a confining pressure of 2500 psi, the results indicate a shift in wettability towards more CO 2 -wet conditions for both rock types under all strategies with changes in CA of 61.6–83.4° and 77.6–87.9° and 81.5–124.2° and 94.6–128.0° for sandstone and limestone, respectively. However, the degree of change varies depending on the injection strategy: sandstone exhibits a pronounced response to the CCI strategy, with up to a 77% increase in contact angle (CA), particularly after extended exposure. At the same time, WAG shows the least change, suggesting that water introduction slows surface modification. For limestone, the changes in CA ranged from 9% to 49% across strategies, with WAG and SAI being more effective in altering its wettability. This study underscores the importance of selecting suitable CO 2 injection strategies based on rock type and wettability characteristics to maximize carbon storage efficiency. The findings offer valuable insights into the complex interactions of fluid–rock systems and a guide for enhancing the design and implementation of CCS technologies in various geological settings.

Suggested Citation

  • Stella I. Eyitayo & Gamadi Talal & Oladoyin Kolawole & Chinedu J. Okere & Ion Ispas & Nachiket Arbad & Hossein Emadibaladehi & Marshall C. Watson, 2024. "Experimental Investigation of the Impact of CO 2 Injection Strategies on Rock Wettability Alteration for CCS Applications," Energies, MDPI, vol. 17(11), pages 1-23, May.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:11:p:2600-:d:1403734
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    References listed on IDEAS

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    1. Farajzadeh, R. & Eftekhari, A.A. & Dafnomilis, G. & Lake, L.W. & Bruining, J., 2020. "On the sustainability of CO2 storage through CO2 – Enhanced oil recovery," Applied Energy, Elsevier, vol. 261(C).
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