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• W3172169459 endingPage "130031" @default.
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• W3172169459 abstract "• Salt precipitation in CO 2 -Plume-Geothermal systems is studied. • The capillary backflow phenomenon is found to influence the precipitation near well. • A new parameter, BEP (backflow extent parameter) is defined. • BEP has a semi-linear correlation with the amounts salt. • BEP has an exponential correlation with the resistance factor at the injection well. Utilizing CO 2 -plume geothermal systems allows both carbon dioxide storage (about 12% of the injected CO 2 – 1.4 Mt – in this study) and geothermal heat exploitation by producing hot fluid. However, the commercial and technical feasibility aspects of such systems are major challenges to address. Salt precipitation is a common phenomenon that governs near-well damage and pressure build-up. Although various governing parameters affect the amount and the extent of salt precipitation, capillary-driven backflow is considered in a recent review paper by Miri and Hellevang (2016) as a key mechanism that determines regimes of salt precipitation. As a result, a comprehensive sensitivity analysis is performed on a wide range of parameters, including relative permeability and capillary pressure curves; injection flow rate and temperature; and reservoir’s initial salinity, porosity, and temperature to underpin the role of capillary pressure and capillary-driven backflow on salt precipitation. Moreover, a backflow extent parameter (BEP) is defined, through which the brine backflow velocity profile is linked to salt precipitation. It is observed that capillary backflow significantly influences the pattern and enhances near-well salt precipitation. Also BEP is found to have a semi-linear relation to the amount of the precipitated salt. Also, increase in brine salinity (up to a critical value ~ 175 , 000 ppm for our simulations) resulted in a significant reduction in reservoir porosity and permeability surrounding the injection well. In addition, the imposed required pumping power is analyzed, and an average (over all salinities) 20% increase of pumping power is required to keep the injection rate constant at the present study." @default.
• W3172169459 created "2021-06-22" @default.
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• W3172169459 date "2021-12-01" @default.
• W3172169459 modified "2023-10-10" @default.
• W3172169459 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si67.svg><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-plume geothermal processes: A parametric study of salt precipitation influenced by capillary-driven backflow" @default.
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• W3172169459 doi "https://doi.org/10.1016/j.cej.2021.130031" @default.
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