Interaction between CO<inf>2</inf>-rich water and hydrated Portland cement and ultramafic rocks
CO2 geological storage in deep rock formations is a possible strategy to mitigate the atmospheric CO2 concentration. In storage sites, CO2 is injected through wells. The space between the metal casing of the wellbore and the host rock is filled with Portland cement in which micro-fractures on flow paths between cement and rock may originate. It has been amply shown that the interaction between CO2-rich water, hydrated Portland cement and sedimentary rocks leads to alteration of cement (dissolution of cementitious phases) and rock (dissolution of silicates) and precipitation of secondary minerals. These processes may enhance or seal the existing microfractures through which CO2 may leak. However, the integrity of the cement and (ultra)mafic rocks under acidic conditions has not been investigated. In this study, the geochemical processes associated with the interaction between CO2-rich water and mortar (composed by hydrated Portland cement and quartz aggregates) and two mafic rocks (peridotite and obsidian) were studied to evaluate the stability of wellbores in mafic rocks, i.e., the role of carbonation and dissolution mechanisms during long-term exposures to CO2-rich brines. Three column experiments were performed at 10 bar pressure, room temperature (20 ± 2°C) and two ionic strengths (4.0·10-4 M and 2.8·10-2 M). The chemical composition of the effluents was examined over time and reproduced by 2D reactive transport simulations. Experimental and model results show that dissolution of the cement phases contributed to cement alteration and buffered the solution pH, rendering low rock alteration. Water residence time affected the precipitation of secondary CO2-bearing minerals.
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Elsevier
2023-03-01
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Subjects: | Wellbore, Cement, CO geological storage 2, Mortar, Obsidian, Peridotite, |
Online Access: | http://hdl.handle.net/10261/289267 http://dx.doi.org/10.13039/501100004837 https://api.elsevier.com/content/abstract/scopus_id/85147339728 |
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dig-idaea-es-10261-2892672024-05-18T20:52:17Z Interaction between CO<inf>2</inf>-rich water and hydrated Portland cement and ultramafic rocks Xu, Jiaqi Ceballos, Elina Cama, Jordi Soler, Josep M. Ministerio de Ciencia e Innovación (España) 0000-0002-9187-4576 0000-0001-6623-8116 0000-0002-8949-3088 0000-0003-0741-249X Wellbore Cement CO geological storage 2 Mortar Obsidian Peridotite CO2 geological storage in deep rock formations is a possible strategy to mitigate the atmospheric CO2 concentration. In storage sites, CO2 is injected through wells. The space between the metal casing of the wellbore and the host rock is filled with Portland cement in which micro-fractures on flow paths between cement and rock may originate. It has been amply shown that the interaction between CO2-rich water, hydrated Portland cement and sedimentary rocks leads to alteration of cement (dissolution of cementitious phases) and rock (dissolution of silicates) and precipitation of secondary minerals. These processes may enhance or seal the existing microfractures through which CO2 may leak. However, the integrity of the cement and (ultra)mafic rocks under acidic conditions has not been investigated. In this study, the geochemical processes associated with the interaction between CO2-rich water and mortar (composed by hydrated Portland cement and quartz aggregates) and two mafic rocks (peridotite and obsidian) were studied to evaluate the stability of wellbores in mafic rocks, i.e., the role of carbonation and dissolution mechanisms during long-term exposures to CO2-rich brines. Three column experiments were performed at 10 bar pressure, room temperature (20 ± 2°C) and two ionic strengths (4.0·10-4 M and 2.8·10-2 M). The chemical composition of the effluents was examined over time and reproduced by 2D reactive transport simulations. Experimental and model results show that dissolution of the cement phases contributed to cement alteration and buffered the solution pH, rendering low rock alteration. Water residence time affected the precipitation of secondary CO2-bearing minerals. We would like to thank the Department of Mineralogy of University of Barcelona (Catalonia) for providing the rock material for this study. We would like to thank Jordi Bellés, Natàlia Moreno, Rafael Bartrolí and Mercè Cabanas (IDAEA), David Artiga and Maite Romero (SCT-University of Barcelona) for analytical assistance. This work has been financed by the CGL2017-82331-R project (Spanish Ministry of Economy and Competitiveness), with contribution of FEDER founds, and the 2021 SGR 00308 project (Catalan Government). IDAEA-CSIC is a Centre of Excellence Severo Ochoa (Spanish Ministry of Science and Innovation, Project CEX2018-000794-S funded by MCIN/AEI/10.13039/501100011033). We thank the associate editor, Charles Jenkins, and an anonymous reviewer for their constructive comments that improved the final manuscript. Peer reviewed 2023-02-15T08:23:08Z 2023-02-15T08:23:08Z 2023-03-01 artículo http://purl.org/coar/resource_type/c_6501 International Journal of Greenhouse Gas Control 124: 103846 (2023) 17505836 http://hdl.handle.net/10261/289267 10.1016/j.ijggc.2023.103846 http://dx.doi.org/10.13039/501100004837 2-s2.0-85147339728 https://api.elsevier.com/content/abstract/scopus_id/85147339728 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MCIN/AEI/10.13039/501100011033 International Journal of Greenhouse Gas Control Postprint https://doi.org/10.1016/j.ijggc.2023.103846 Sí embargo_20250301 Elsevier |
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Wellbore Cement CO geological storage 2 Mortar Obsidian Peridotite Wellbore Cement CO geological storage 2 Mortar Obsidian Peridotite |
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Wellbore Cement CO geological storage 2 Mortar Obsidian Peridotite Wellbore Cement CO geological storage 2 Mortar Obsidian Peridotite Xu, Jiaqi Ceballos, Elina Cama, Jordi Soler, Josep M. Interaction between CO<inf>2</inf>-rich water and hydrated Portland cement and ultramafic rocks |
description |
CO2 geological storage in deep rock formations is a possible strategy to mitigate the atmospheric CO2 concentration. In storage sites, CO2 is injected through wells. The space between the metal casing of the wellbore and the host rock is filled with Portland cement in which micro-fractures on flow paths between cement and rock may originate. It has been amply shown that the interaction between CO2-rich water, hydrated Portland cement and sedimentary rocks leads to alteration of cement (dissolution of cementitious phases) and rock (dissolution of silicates) and precipitation of secondary minerals. These processes may enhance or seal the existing microfractures through which CO2 may leak. However, the integrity of the cement and (ultra)mafic rocks under acidic conditions has not been investigated. In this study, the geochemical processes associated with the interaction between CO2-rich water and mortar (composed by hydrated Portland cement and quartz aggregates) and two mafic rocks (peridotite and obsidian) were studied to evaluate the stability of wellbores in mafic rocks, i.e., the role of carbonation and dissolution mechanisms during long-term exposures to CO2-rich brines. Three column experiments were performed at 10 bar pressure, room temperature (20 ± 2°C) and two ionic strengths (4.0·10-4 M and 2.8·10-2 M). The chemical composition of the effluents was examined over time and reproduced by 2D reactive transport simulations. Experimental and model results show that dissolution of the cement phases contributed to cement alteration and buffered the solution pH, rendering low rock alteration. Water residence time affected the precipitation of secondary CO2-bearing minerals. |
author2 |
Ministerio de Ciencia e Innovación (España) |
author_facet |
Ministerio de Ciencia e Innovación (España) Xu, Jiaqi Ceballos, Elina Cama, Jordi Soler, Josep M. |
format |
artículo |
topic_facet |
Wellbore Cement CO geological storage 2 Mortar Obsidian Peridotite |
author |
Xu, Jiaqi Ceballos, Elina Cama, Jordi Soler, Josep M. |
author_sort |
Xu, Jiaqi |
title |
Interaction between CO<inf>2</inf>-rich water and hydrated Portland cement and ultramafic rocks |
title_short |
Interaction between CO<inf>2</inf>-rich water and hydrated Portland cement and ultramafic rocks |
title_full |
Interaction between CO<inf>2</inf>-rich water and hydrated Portland cement and ultramafic rocks |
title_fullStr |
Interaction between CO<inf>2</inf>-rich water and hydrated Portland cement and ultramafic rocks |
title_full_unstemmed |
Interaction between CO<inf>2</inf>-rich water and hydrated Portland cement and ultramafic rocks |
title_sort |
interaction between co<inf>2</inf>-rich water and hydrated portland cement and ultramafic rocks |
publisher |
Elsevier |
publishDate |
2023-03-01 |
url |
http://hdl.handle.net/10261/289267 http://dx.doi.org/10.13039/501100004837 https://api.elsevier.com/content/abstract/scopus_id/85147339728 |
work_keys_str_mv |
AT xujiaqi interactionbetweencoinf2infrichwaterandhydratedportlandcementandultramaficrocks AT ceballoselina interactionbetweencoinf2infrichwaterandhydratedportlandcementandultramaficrocks AT camajordi interactionbetweencoinf2infrichwaterandhydratedportlandcementandultramaficrocks AT solerjosepm interactionbetweencoinf2infrichwaterandhydratedportlandcementandultramaficrocks |
_version_ |
1802820372801781760 |