Self-healing mechanism of deposited carbonates in cement cracks under CO2 storage well conditions
In CO2 geological storage wells, the leakage of CO2 along the micro-cracks of the cement sheath of abandoned wells is one of the main risks of CO2 leakage. The chemical reaction between CO2 and oil well cement can realize self-healing of micro-cracks in the cement sheath. In this study, self-healing...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-10-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmats.2022.1013545/full |
| _version_ | 1797995959116890112 |
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| author | Xuesong Xing Guangrong Zhong Zhiqiang Wu Jingxuan Cai Jingxuan Cai Xiaowei Cheng Xiaowei Cheng |
| author_facet | Xuesong Xing Guangrong Zhong Zhiqiang Wu Jingxuan Cai Jingxuan Cai Xiaowei Cheng Xiaowei Cheng |
| author_sort | Xuesong Xing |
| collection | DOAJ |
| description | In CO2 geological storage wells, the leakage of CO2 along the micro-cracks of the cement sheath of abandoned wells is one of the main risks of CO2 leakage. The chemical reaction between CO2 and oil well cement can realize self-healing of micro-cracks in the cement sheath. In this study, self-healing experiments of artificial cracks in cement-based materials were carried out by simulating the working conditions of high temperature, high pressure and CO2-rich CCS. The formation process and self-healing effect of calcium carbonate (CaCO3) in oil well cement-based materials induced by CO2 under different exposure environments were explored, and the self-healing products were analyzed by X-ray diffraction (XRD) and environmental scanning electron microscopy (ESEM and EDX). X-ray computed tomography (μ-CT) was used to reconstruct the changes of cracks in 3D, and compressive strength, porosity, and permeability were used to evaluate the self-healing properties of cement-based material cracks. The results indicated that for the CS-28 (the samples reacted with humid CO2 for 28 days) and AS-28 (the samples reacted with humid air for 28 days) samples, the compressive strength increased by 56.67% and 10.38%, the porosity decreased by 59.37% and 18.19%, and the permeability decreased by 59.91% and 28.07%, respectively. The crack-volume reduction rate of the CS-28 specimen was 57.08%, and the pore-volume reduction rate was 69.20%. Many massive, needle shaped CaCO3 crystals were formed in the pores and cracks of the sample. The reconstruction of the 3D structure of self-healing cement shows that the micro-cracks of the cement are sealed but the pores are increased. The damage prediction based on von Mises stress shows that under the axial force, the healing layer is not prone to damage. This study provides a theoretical and experimental basis for applying self-healing technology in CCS downhole environment, improving the service life of cement sheath and preventing the leakage of stored CO2. |
| first_indexed | 2024-04-11T10:08:47Z |
| format | Article |
| id | doaj.art-d018bacdb4ac413883bcf22948b29b7e |
| institution | Directory Open Access Journal |
| issn | 2296-8016 |
| language | English |
| last_indexed | 2024-04-11T10:08:47Z |
| publishDate | 2022-10-01 |
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| series | Frontiers in Materials |
| spelling | doaj.art-d018bacdb4ac413883bcf22948b29b7e2022-12-22T04:30:09ZengFrontiers Media S.A.Frontiers in Materials2296-80162022-10-01910.3389/fmats.2022.10135451013545Self-healing mechanism of deposited carbonates in cement cracks under CO2 storage well conditionsXuesong Xing0Guangrong Zhong1Zhiqiang Wu2Jingxuan Cai3Jingxuan Cai4Xiaowei Cheng5Xiaowei Cheng6CNOOC Research Institute Co.,Ltd., Beijing, ChinaCNPC Chuanqing Drilling Engineering Co.,Ltd., Chuandong Drilling Company, Chongqing, ChinaCNOOC Research Institute Co.,Ltd., Beijing, ChinaSchool of New Energy and Materials, Southwest Petroleum University, Chengdu, ChinaKey Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaSchool of New Energy and Materials, Southwest Petroleum University, Chengdu, ChinaKey Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaIn CO2 geological storage wells, the leakage of CO2 along the micro-cracks of the cement sheath of abandoned wells is one of the main risks of CO2 leakage. The chemical reaction between CO2 and oil well cement can realize self-healing of micro-cracks in the cement sheath. In this study, self-healing experiments of artificial cracks in cement-based materials were carried out by simulating the working conditions of high temperature, high pressure and CO2-rich CCS. The formation process and self-healing effect of calcium carbonate (CaCO3) in oil well cement-based materials induced by CO2 under different exposure environments were explored, and the self-healing products were analyzed by X-ray diffraction (XRD) and environmental scanning electron microscopy (ESEM and EDX). X-ray computed tomography (μ-CT) was used to reconstruct the changes of cracks in 3D, and compressive strength, porosity, and permeability were used to evaluate the self-healing properties of cement-based material cracks. The results indicated that for the CS-28 (the samples reacted with humid CO2 for 28 days) and AS-28 (the samples reacted with humid air for 28 days) samples, the compressive strength increased by 56.67% and 10.38%, the porosity decreased by 59.37% and 18.19%, and the permeability decreased by 59.91% and 28.07%, respectively. The crack-volume reduction rate of the CS-28 specimen was 57.08%, and the pore-volume reduction rate was 69.20%. Many massive, needle shaped CaCO3 crystals were formed in the pores and cracks of the sample. The reconstruction of the 3D structure of self-healing cement shows that the micro-cracks of the cement are sealed but the pores are increased. The damage prediction based on von Mises stress shows that under the axial force, the healing layer is not prone to damage. This study provides a theoretical and experimental basis for applying self-healing technology in CCS downhole environment, improving the service life of cement sheath and preventing the leakage of stored CO2.https://www.frontiersin.org/articles/10.3389/fmats.2022.1013545/fullcarbon capture and storagecracksself-healingCaCO3oil-well cement |
| spellingShingle | Xuesong Xing Guangrong Zhong Zhiqiang Wu Jingxuan Cai Jingxuan Cai Xiaowei Cheng Xiaowei Cheng Self-healing mechanism of deposited carbonates in cement cracks under CO2 storage well conditions Frontiers in Materials carbon capture and storage cracks self-healing CaCO3 oil-well cement |
| title | Self-healing mechanism of deposited carbonates in cement cracks under CO2 storage well conditions |
| title_full | Self-healing mechanism of deposited carbonates in cement cracks under CO2 storage well conditions |
| title_fullStr | Self-healing mechanism of deposited carbonates in cement cracks under CO2 storage well conditions |
| title_full_unstemmed | Self-healing mechanism of deposited carbonates in cement cracks under CO2 storage well conditions |
| title_short | Self-healing mechanism of deposited carbonates in cement cracks under CO2 storage well conditions |
| title_sort | self healing mechanism of deposited carbonates in cement cracks under co2 storage well conditions |
| topic | carbon capture and storage cracks self-healing CaCO3 oil-well cement |
| url | https://www.frontiersin.org/articles/10.3389/fmats.2022.1013545/full |
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