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Chavez Panduro EA, Torsæter M, Gawel K, Bjørge R, Gibaud A, Yang Y, Bruns S, Zheng Y, Sørensen HO, Breiby DW. In-Situ X-ray Tomography Study of Cement Exposed to CO 2 Saturated Brine. Environ Sci Technol 2017; 51:9344-9351. [PMID: 28701043 DOI: 10.1021/acs.est.6b06534] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
For successful CO2 storage in underground reservoirs, the potential problem of CO2 leakage needs to be addressed. A profoundly improved understanding of the behavior of fractured cement under realistic subsurface conditions including elevated temperature, high pressure and the presence of CO2 saturated brine is required. Here, we report in situ X-ray micro computed tomography (μ-CT) studies visualizing the microstructural changes upon exposure of cured Portland cement with an artificially engineered leakage path (cavity) to CO2 saturated brine at high pressure. Carbonation of the bulk cement, self-healing of the leakage path in the cement specimen, and leaching of CaCO3 were thus directly observed. The precipitation of CaCO3, which is of key importance as a possible healing mechanism of fractured cement, was found to be enhanced in confined regions having limited access to CO2. For the first time, the growth kinetics of CaCO3 under more realistic well conditions have thus been estimated quantitatively. Combining the μ-CT observations with scanning electron microscopy resulted in a detailed understanding of the processes involved in the carbonation of cement.
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Affiliation(s)
- E A Chavez Panduro
- Department of Physics, Norwegian University of Science and Technology , Høgskoleringen 5, 7491 Trondheim, Norway
| | - M Torsæter
- SINTEF Petroleum Research , Trondheim, Norway
| | - K Gawel
- SINTEF Petroleum Research , Trondheim, Norway
| | - R Bjørge
- SINTEF Materials and Chemistry , Trondheim, Norway
| | - A Gibaud
- LUMAN, IMMM, UMR 6283 CNRS, Université du Maine , Le Mans Cedex 09, France
| | - Y Yang
- Nano-Science Center, Department of Chemistry, University of Copenhagen , DK-2100 Copenhagen, Denmark
| | - S Bruns
- Nano-Science Center, Department of Chemistry, University of Copenhagen , DK-2100 Copenhagen, Denmark
| | - Y Zheng
- Department of Physics, Technical University of Denmark , Lyngby, Denmark
| | - H O Sørensen
- Nano-Science Center, Department of Chemistry, University of Copenhagen , DK-2100 Copenhagen, Denmark
| | - D W Breiby
- Department of Physics, Norwegian University of Science and Technology , Høgskoleringen 5, 7491 Trondheim, Norway
- Department of Microsystems, University College of Southeast Norway , Campus Vestfold, 3184 Borre, Norway
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