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Geosciences 2018, 8(8), 290; https://doi.org/10.3390/geosciences8080290

Experimental Assessment of the Sealing Potential of Hydrated Solgel for the Remediation of Leaky Reservoirs

Géosciences Montpellier, CNRS-Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
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Received: 3 July 2018 / Revised: 26 July 2018 / Accepted: 30 July 2018 / Published: 4 August 2018
(This article belongs to the Special Issue Geological Storage of Gases as a Tool for Energy Transition)
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Abstract

The full-scale deployment of underground storage of CO2 in permeable sedimentary reservoirs depends strongly on the sealing capacity of the caprocks and wellbore cement that may be degraded leading to hydraulic discontinuities. Remediation technologies consisting in rebuilding the sealing capacity of the degraded material, or adding a new sealing layer, is a critical issue as part of the risk mitigation procedure required for underground CO2 storage. Actually, engineered Portland cement injection is the foremost available industrial technique; however, alternative products offering, for instance, better injection properties, are currently investigated with variable success so far. In this study, a new technique aimed at using a low viscosity hydrated solgel as sealant product in case of leakage is presented. Its low cost, high injectivity capacity and low density of the hydrated product (hydrogel) makes this technique attractive. The solgel synthesis was optimized for (1) reducing energetic and material costs; (2) improving the chemical and mechanical properties of the emplaced product and (3) controlling the duration of the aging process in order to form a solid hydrogel after a few days. Permeability tests that consisted of injecting the synthesized solgel in different porous media confirmed the sealant capacity of the emplaced hydrogel to significantly reduce rock permeability. View Full-Text
Keywords: solgel; remediation of leaky reservoirs; underground CO2 storage solgel; remediation of leaky reservoirs; underground CO2 storage
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Garcia-Rios, M.; Gouze, P. Experimental Assessment of the Sealing Potential of Hydrated Solgel for the Remediation of Leaky Reservoirs. Geosciences 2018, 8, 290.

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