Abstract
Carbonate rocks and carbonate zones in sandstone formations can experience chemical reaction with CO2 acidized water; this can degrade the fabric of the carbonate rock leading to the formation of damaged regions that are referred to as wormholes. The experimental research shows that once a wormhole is formed in a carbonate zone, the retention capabilities of the storage medium are lost, leading to unrestricted flow of the injected fluids in the defective zones. Collateral effects of such erosion processes is the accumulation of dissolved solids in remote locations that can promote permeability reduction causing potential zones for the initiation of hydraulic fracture and void-compaction-induced distress to the caprock barriers.
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Acknowledgements
The work described in the paper was supported by the following research grants awarded to the first author: A Discovery Grant awarded by the Natural Sciences and Engineering Research Council of Canada and a Research Grant awarded by Carbon Management Canada.
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Selvadurai, A.P.S., Couture, CB. (2017). Wormholes: Chemically Damaged States in Carbonate Rocks During CO2-Acidized Fluid Flow. In: Papamichos, E., Papanastasiou, P., Pasternak, E., Dyskin, A. (eds) Bifurcation and Degradation of Geomaterials with Engineering Applications. IWBDG 2017. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-319-56397-8_39
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