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

Widuramina Amarasinghe, Ingebret Fjelde, Nils Giske and Ying Guo
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Widuramina Amarasinghe: NORCE Norwegian Research Center AS, P.O. Box 8046, 4068 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

Energies, 2021, vol. 14, issue 1, 1-13

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.

Keywords: convection; porous media; reservoir conditions; oil; CO 2 dissolution; 3-dimensional column (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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