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Conference Papers Year : 2013

Reactivity of cement and steel interfaces in geological carbon storage

Abstract

To some extent, carbon storage in geological environnement is always submitted to leakage threats. Among the different possible scenarios, wells in contact with the storage zone are frequently regarded as the best candidates for CO2 leakage. Wells materials, namely cement and steel, can both be corroded by the acidity of CO2 rich fluids. Moreover, the interfaces between those materials are suggested to be the preferential pathways for fluids progressions. In order to assess this specific reactivity, a series of cement/tubing assemblies were submited to storage conditions (150 bar of CO2 at 65°C) during 6 weeks. Beside the assemblies interfaces, the tested parameters were the cement composition (CEM I, III and V), the cement to water ratio (0.14 to 1.24) and the salinity (0 and 20 g.l-1). Carbonation of the cements and corrosion of the steel were quantified in each case as well as the resulting porosity, permeability and chemistry of the solid and liquid phases. As expected, the main conclusion of this approach demonstrate the chief role of the interfaces in the corrosion process and a surprisingly good resistance of the portland cement to such attacks.
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Dates and versions

hal-00831742 , version 1 (07-06-2013)

Identifiers

  • HAL Id : hal-00831742 , version 1

Cite

Sébastien Dupraz, Antonin Fabbri, Sandrine Grataloup. Reactivity of cement and steel interfaces in geological carbon storage. Goldschmidt conference 2013, 2013, Florence, Italy. ⟨hal-00831742⟩
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