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    Multi-phase flow simulation of CO2 leakage through a fractured caprock in response to mitigation strategies

    Access Status
    Fulltext not available
    Authors
    Vialle, Stephanie
    Druhan, J.
    Maher, K.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Vialle, S. and Druhan, J. and Maher, K. 2016. Multi-phase flow simulation of CO2 leakage through a fractured caprock in response to mitigation strategies. International Journal of Greenhouse Gas Control. 44: pp. 11-25.
    Source Title
    International Journal of Greenhouse Gas Control
    DOI
    10.1016/j.ijggc.2015.10.007
    ISSN
    1750-5836
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/18484
    Collection
    • Curtin Research Publications
    Abstract

    To evaluate the effectiveness of several mitigation strategies, we developed two-dimensional flow and transport simulations of carbon dioxide (CO2) leakage through the fractured caprock of a storage reservoir, over timescales of 2-10 years. The fractured system was modeled as a low-permeability fault core surrounded by a fractured damage zone, as would be expected for a low-porosity caprock that underwent brittle deformation. To represent the damage zone, we introduced heterogeneities in the initial permeability field by using a grid-based continuum model where the upscaling relationship for permeability as a function of fracture aperture and density is given by an analytical expression. The first mitigation strategy, injection of a drying agent (dry CO2 here) below the damage zone, leads to precipitation of solids and local decreases in permeability that cause lateral migration of the leak and self-sealing of the fractured system. The higher the maximum value of the permeability in the damage zone, the less time required to reduce the leak rate. The second mitigation strategy evaluated controlled permeability reduction in the fractured zone by simulating an idealized emplaced sealant. Collectively, modeling results suggest that knowledge of the hydrodynamics of the leak is required to optimize the location of sealant applications within the fracture zone.

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