Pore-scale Considerations on Ostwald Ripening in Rocks

Residually trapped CO2 is often assumed to be stable when simulating its long-term fate in geological storage reservoirs. Ostwald ripening is a mechanism that could potentially cause remobilization. We compare the case of bubbles of gas in a free liquid to that of a solid porous matrix. Using a new...

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Bibliographic Details
Published in:Energy procedia 2017-07, Vol.114 (C), p.4857-4864
Main Authors: de Chalendar, Jacques A., Garing, Charlotte, Benson, Sally M.
Format: Article
Language:English
Subjects:
bio-inspired, mechanical behavior, carbon sequestration
capillary pressure
Carbon sequestration
Ostwald ripening
pore network modeling
residual trapping
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Summary:Residually trapped CO2 is often assumed to be stable when simulating its long-term fate in geological storage reservoirs. Ostwald ripening is a mechanism that could potentially cause remobilization. We compare the case of bubbles of gas in a free liquid to that of a solid porous matrix. Using a new continuous pore network model, we gain insights on Ostwald Ripening in rocks and estimate time scales of evolution of multi-ganglia systems. Evolution is found to be highly dependent on system initialization as well as on pore structure. For residually trapped CO2 in homogeneous rocks, a stable equilibrium is conceptually possible.
ISSN:1876-6102
1876-6102
DOI:10.1016/j.egypro.2017.03.1626