Fast Evaluation of Caprock Strength Sensitivity to Different CO2 Solutions Using Small Sample Techniques
Abstract The Draupne shale is a rock formation functioning as overburden for gas reservoirs in the Norwegian Sea and potentially as caprock for future CO 2 storage locations as well. In this paper, the Draupne shale was exposed to several fluids: CO 2 gas, supercritical CO 2 , CO 2 gas dissolved in...
Published in: | Rock Mechanics and Rock Engineering |
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Springer Science and Business Media LLC
2021
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Online Access: | http://dx.doi.org/10.1007/s00603-021-02641-6 https://link.springer.com/content/pdf/10.1007/s00603-021-02641-6.pdf https://link.springer.com/article/10.1007/s00603-021-02641-6/fulltext.html |
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crspringernat:10.1007/s00603-021-02641-6 2023-05-15T17:47:07+02:00 Fast Evaluation of Caprock Strength Sensitivity to Different CO2 Solutions Using Small Sample Techniques Edvardsen, Laura Bhuiyan, Mohammad H. Cerasi, Pierre R. Bjørge, Ruben Norges Forskningsråd SINTEF AS 2021 http://dx.doi.org/10.1007/s00603-021-02641-6 https://link.springer.com/content/pdf/10.1007/s00603-021-02641-6.pdf https://link.springer.com/article/10.1007/s00603-021-02641-6/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Rock Mechanics and Rock Engineering volume 54, issue 12, page 6123-6133 ISSN 0723-2632 1434-453X Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering journal-article 2021 crspringernat https://doi.org/10.1007/s00603-021-02641-6 2022-01-04T10:26:33Z Abstract The Draupne shale is a rock formation functioning as overburden for gas reservoirs in the Norwegian Sea and potentially as caprock for future CO 2 storage locations as well. In this paper, the Draupne shale was exposed to several fluids: CO 2 gas, supercritical CO 2 , CO 2 gas dissolved in brine, supercritical CO 2 dissolved in brine, as well as brine and dry air. The motivation for the exposure tests was to investigate whether injected CO 2 in a reservoir coming into contact with the caprock could change the caprock’s mechanical properties and increase the risk for leakage of the stored CO 2 . In addition, a systematic exposure study will provide more insight into the various processes susceptible of altering the shale’s shear strength and acoustic velocity, such as clay hydration, mineral dissolution, and capillary forces. Due to the low permeability of the shale, experiments were conducted on mm-sized disk samples, reducing fluid diffusion into the shale, and allowing for many repeated tests on disks close by in the original core. The punch method, where a small circle is punched out of the shale, was used to assess shear strength, while continuous wave technique was used to assess ultrasonic velocity. Results show that the shale is not noticeably sensitive to CO 2 , in the sense that no additional weakening is observed in the presence of CO 2 as compared to brine exposure. This last weakening effect is probably due to poor matching between pore fluid salinity and exposure brine strength. Article in Journal/Newspaper Norwegian Sea Springer Nature (via Crossref) Norwegian Sea Rock Mechanics and Rock Engineering 54 12 6123 6133 |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering |
spellingShingle |
Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering Edvardsen, Laura Bhuiyan, Mohammad H. Cerasi, Pierre R. Bjørge, Ruben Fast Evaluation of Caprock Strength Sensitivity to Different CO2 Solutions Using Small Sample Techniques |
topic_facet |
Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering |
description |
Abstract The Draupne shale is a rock formation functioning as overburden for gas reservoirs in the Norwegian Sea and potentially as caprock for future CO 2 storage locations as well. In this paper, the Draupne shale was exposed to several fluids: CO 2 gas, supercritical CO 2 , CO 2 gas dissolved in brine, supercritical CO 2 dissolved in brine, as well as brine and dry air. The motivation for the exposure tests was to investigate whether injected CO 2 in a reservoir coming into contact with the caprock could change the caprock’s mechanical properties and increase the risk for leakage of the stored CO 2 . In addition, a systematic exposure study will provide more insight into the various processes susceptible of altering the shale’s shear strength and acoustic velocity, such as clay hydration, mineral dissolution, and capillary forces. Due to the low permeability of the shale, experiments were conducted on mm-sized disk samples, reducing fluid diffusion into the shale, and allowing for many repeated tests on disks close by in the original core. The punch method, where a small circle is punched out of the shale, was used to assess shear strength, while continuous wave technique was used to assess ultrasonic velocity. Results show that the shale is not noticeably sensitive to CO 2 , in the sense that no additional weakening is observed in the presence of CO 2 as compared to brine exposure. This last weakening effect is probably due to poor matching between pore fluid salinity and exposure brine strength. |
author2 |
Norges Forskningsråd SINTEF AS |
format |
Article in Journal/Newspaper |
author |
Edvardsen, Laura Bhuiyan, Mohammad H. Cerasi, Pierre R. Bjørge, Ruben |
author_facet |
Edvardsen, Laura Bhuiyan, Mohammad H. Cerasi, Pierre R. Bjørge, Ruben |
author_sort |
Edvardsen, Laura |
title |
Fast Evaluation of Caprock Strength Sensitivity to Different CO2 Solutions Using Small Sample Techniques |
title_short |
Fast Evaluation of Caprock Strength Sensitivity to Different CO2 Solutions Using Small Sample Techniques |
title_full |
Fast Evaluation of Caprock Strength Sensitivity to Different CO2 Solutions Using Small Sample Techniques |
title_fullStr |
Fast Evaluation of Caprock Strength Sensitivity to Different CO2 Solutions Using Small Sample Techniques |
title_full_unstemmed |
Fast Evaluation of Caprock Strength Sensitivity to Different CO2 Solutions Using Small Sample Techniques |
title_sort |
fast evaluation of caprock strength sensitivity to different co2 solutions using small sample techniques |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1007/s00603-021-02641-6 https://link.springer.com/content/pdf/10.1007/s00603-021-02641-6.pdf https://link.springer.com/article/10.1007/s00603-021-02641-6/fulltext.html |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Norwegian Sea |
genre_facet |
Norwegian Sea |
op_source |
Rock Mechanics and Rock Engineering volume 54, issue 12, page 6123-6133 ISSN 0723-2632 1434-453X |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00603-021-02641-6 |
container_title |
Rock Mechanics and Rock Engineering |
container_volume |
54 |
container_issue |
12 |
container_start_page |
6123 |
op_container_end_page |
6133 |
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1766151435482824704 |