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CO 2 Convective Dissolution in Oil-Saturated Unconsolidated Porous Media at Reservoir Conditions

Author

Listed:
  • Widuramina Amarasinghe

    (NORCE Norwegian Research Center AS, P.O. Box 8046, 4068 Stavanger, Norway
    Department of Energy Resources, University of Stavanger, P.O. Box 8600, 4036 Stavanger, Norway)

  • Ingebret Fjelde

    (NORCE Norwegian Research Center AS, P.O. Box 8046, 4068 Stavanger, Norway)

  • Nils Giske

    (NORCE Norwegian Research Center AS, P.O. Box 8046, 4068 Stavanger, Norway)

  • Ying Guo

    (NORCE Norwegian Research Center AS, P.O. Box 8046, 4068 Stavanger, Norway
    Department of Energy Resources, University of Stavanger, P.O. Box 8600, 4036 Stavanger, Norway)

Abstract

During CO 2 storage, CO 2 plume mixes with the water and oil present at the reservoir, initiated by diffusion followed by a density gradient that leads to a convective flow. Studies are available where CO 2 convective mixing have been studied in water phase but limited in oil phase. This study was conducted to reach this gap, and experiments were conducted in a vertically packed 3-dimensional column with oil-saturated unconsolidated porous media at 100 bar and 50 °C (representative of reservoir pressure and temperature conditions). N -Decane and crude oil were used as oils, and glass beads as porous media. A bromothymol blue water solution-filled sapphire cell connected at the bottom of the column was used to monitor the CO 2 breakthrough. With the increase of the Rayleigh number, the CO 2 transport rate in n -decane was found to increase as a function of a second order polynomial. R a number vs. dimensionless time τ had a power relationship in the form of R a = c × τ − n . The overall pressure decay was faster in n -decane compared to crude oil for similar permeability (4 D), and the crude oil had a breakthrough time three times slower than in n -decane. The results were compared with similar experiments that have been carried out using water.

Suggested Citation

  • Widuramina Amarasinghe & Ingebret Fjelde & Nils Giske & Ying Guo, 2021. "CO 2 Convective Dissolution in Oil-Saturated Unconsolidated Porous Media at Reservoir Conditions," Energies, MDPI, vol. 14(1), pages 1-13, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:1:p:233-:d:474646
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    References listed on IDEAS

    as
    1. Pengfei Lv & Yu Liu & Lanlan Jiang & Yongchen Song & Bohao Wu & Jiafei Zhao & Yi Zhang, 2016. "Experimental determination of wettability and heterogeneity effect on CO 2 distribution in porous media," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 6(3), pages 401-415, June.
    2. Pengfei Lv & Yu Liu & Junlin Chen & Lanlan Jiang & Bohao Wu & Shuyang Liu & Yongchen Song, 2017. "Pore†scale investigation of effects of heterogeneity on CO2 geological storage using stratified sand packs," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 7(6), pages 972-987, December.
    3. Carelle Thomas & Sam Dehaeck & Anne De Wit, 2018. "Convective dissolution of CO2 in water and salt solutions," ULB Institutional Repository 2013/270512, ULB -- Universite Libre de Bruxelles.
    Full references (including those not matched with items on IDEAS)

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