Precipitation/dissolution of calcium carbonate in wellbore cement and its implications for the seal integrity of abandoned wells
Wellbore integrity of abandoned wells is of high priority for ensuring the containment of sequestered CO 2 . Carbonic acid formed when injected CO 2 mixes with subsurface brines has the potential to damage well cement so as to compromise the seal integrity of the wellbore. Bench-scale experiments re...
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ftosti:oai:osti.gov:1326359 2023-07-30T04:02:55+02:00 Precipitation/dissolution of calcium carbonate in wellbore cement and its implications for the seal integrity of abandoned wells Matteo, Edward N. Huet, Bruno Scherer, George W. 2021-03-24 application/pdf http://www.osti.gov/servlets/purl/1326359 https://www.osti.gov/biblio/1326359 unknown http://www.osti.gov/servlets/purl/1326359 https://www.osti.gov/biblio/1326359 58 GEOSCIENCES 2021 ftosti 2023-07-11T09:15:31Z Wellbore integrity of abandoned wells is of high priority for ensuring the containment of sequestered CO 2 . Carbonic acid formed when injected CO 2 mixes with subsurface brines has the potential to damage well cement so as to compromise the seal integrity of the wellbore. Bench-scale experiments reported in the literature indicate that the well cement reaction rates are initially fast enough to constitute a potential threat to wellbore integrity. However, it has also been suggested that the formation of calcium carbonate within the cement effectively arrests the acid attack by forming a passivation layer (so called “self -sealing”) that prevents further leaching of cement minerals. As a result, a broader theoretical context is presented here that delineates brine composition regimes that will instigate self-sealing in cement during carbonic acid attack. Other/Unknown Material Carbonic acid SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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58 GEOSCIENCES |
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58 GEOSCIENCES Matteo, Edward N. Huet, Bruno Scherer, George W. Precipitation/dissolution of calcium carbonate in wellbore cement and its implications for the seal integrity of abandoned wells |
topic_facet |
58 GEOSCIENCES |
description |
Wellbore integrity of abandoned wells is of high priority for ensuring the containment of sequestered CO 2 . Carbonic acid formed when injected CO 2 mixes with subsurface brines has the potential to damage well cement so as to compromise the seal integrity of the wellbore. Bench-scale experiments reported in the literature indicate that the well cement reaction rates are initially fast enough to constitute a potential threat to wellbore integrity. However, it has also been suggested that the formation of calcium carbonate within the cement effectively arrests the acid attack by forming a passivation layer (so called “self -sealing”) that prevents further leaching of cement minerals. As a result, a broader theoretical context is presented here that delineates brine composition regimes that will instigate self-sealing in cement during carbonic acid attack. |
author |
Matteo, Edward N. Huet, Bruno Scherer, George W. |
author_facet |
Matteo, Edward N. Huet, Bruno Scherer, George W. |
author_sort |
Matteo, Edward N. |
title |
Precipitation/dissolution of calcium carbonate in wellbore cement and its implications for the seal integrity of abandoned wells |
title_short |
Precipitation/dissolution of calcium carbonate in wellbore cement and its implications for the seal integrity of abandoned wells |
title_full |
Precipitation/dissolution of calcium carbonate in wellbore cement and its implications for the seal integrity of abandoned wells |
title_fullStr |
Precipitation/dissolution of calcium carbonate in wellbore cement and its implications for the seal integrity of abandoned wells |
title_full_unstemmed |
Precipitation/dissolution of calcium carbonate in wellbore cement and its implications for the seal integrity of abandoned wells |
title_sort |
precipitation/dissolution of calcium carbonate in wellbore cement and its implications for the seal integrity of abandoned wells |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1326359 https://www.osti.gov/biblio/1326359 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
http://www.osti.gov/servlets/purl/1326359 https://www.osti.gov/biblio/1326359 |
_version_ |
1772813779297370112 |