Structural and chemical changes from CO2 exposure to self-healing polymer cement composites for geothermal wellbores

•Synchrotron methods provide powerful approach to understand carbonation of polymer cements.•Chemical alteration of the polymer-cement follows the rim carbonation mechanism.•Self-healing cements maintain compressive strength for EGS applications after CO2 exposure. Wellbore cement is subjected to a...

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Veröffentlicht in:Geothermics 2021-01, Vol.89, p.101932, Article 101932
Hauptverfasser: Elbakhshwan, Mohamed S., Gill, Simerjeet K., Rod, Kenton A., Bingham, Emma B., McKinney, Adriana L., Huerta, Nicolas, Lopano, Christina L., Kutchko, Barbara G., Chen-Wiegart, Yu-chen Karen, Zhao, Chonghang, Williams, Garth, Thieme, Juergen, Varga, Tamas, Ecker, Lynne E., Fernandez, Carlos A.
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Sprache:eng
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Zusammenfassung:•Synchrotron methods provide powerful approach to understand carbonation of polymer cements.•Chemical alteration of the polymer-cement follows the rim carbonation mechanism.•Self-healing cements maintain compressive strength for EGS applications after CO2 exposure. Wellbore cement is subjected to a number of mechanical, thermal and chemical stress regimes over its lifetime. Therefore, next-generation wellbore cement formulations need to be evaluated in conditions relevant to these environments. In this work, we investigate the mechanism of the alteration of a novel self-healing polymer-cement composite after exposure to a CO2-rich environment by using synchrotron-based X-ray Fluorescence (XRF), X-ray absorption near edge structure (XANES), and scanning electron microscopy coupled with energy dispersive spectroscopy. Results showed that a chemical alteration of the polymer-cement follows the rim carbonation mechanism, similar to conventional cement, although carbonation takes place to a lesser extent in polymer-cements despite the higher porosity. Along with detailed mechanistic insights on carbonation in polymer-cement composite, the performance of these in CO2-rich environment is further studied using standard compressive strength analysis.
ISSN:0375-6505
1879-3576
DOI:10.1016/j.geothermics.2020.101932