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Study on an Epoxy Resin System Used to Improve the Elasticity of Oil-Well Cement-Based Composites

Oil-well cement-based materials have inherent brittleness; therefore, they cannot be directly used to seal oil and gas wells for a long time. To improve the elasticity of oil-well cement-based composites, a flexible epoxy resin system was developed. The flexibility, TG, and SEM of the cured resin sy...

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Autores principales: Song, Jianjian, Xu, Mingbiao, Tan, Chunqin, You, Fuchang, Wang, Xiaoliang, Zhou, Shanshan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9369680/
https://www.ncbi.nlm.nih.gov/pubmed/35955192
http://dx.doi.org/10.3390/ma15155258
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author Song, Jianjian
Xu, Mingbiao
Tan, Chunqin
You, Fuchang
Wang, Xiaoliang
Zhou, Shanshan
author_facet Song, Jianjian
Xu, Mingbiao
Tan, Chunqin
You, Fuchang
Wang, Xiaoliang
Zhou, Shanshan
author_sort Song, Jianjian
collection PubMed
description Oil-well cement-based materials have inherent brittleness; therefore, they cannot be directly used to seal oil and gas wells for a long time. To improve the elasticity of oil-well cement-based composites, a flexible epoxy resin system was developed. The flexibility, TG, and SEM of the cured resin system were evaluated. At the same time, the resin was added to oil-well cement-based materials to improve its elasticity. The compressive strength and elastic modulus of resin cement stone were tested, and the microstructure was analyzed by XRD, TG, and SEM/EDS. The results showed that the structure of the cured resin is compact, the thermal decomposition temperature is 243.9 °C, and it can recover its original shape after compression. At the curing age of 28 days, the compressive strength of cement-based composites containing 30% resin decreased by 26.7%, while the elastic modulus significantly decreased by 63.2%, and the elasticity of cement-based composites was significantly improved. The formation of hydration products (e.g., calcium silicate hydrate, and calcium hydroxide) in the resin cement slurry is obviously lower than that of pure cement, which is the reason for the decrease in compressive strength. The flexible structure of polymer particles and polymer film formed by epoxy resin is distributed inside the cement stone, which significantly improves the elasticity of oil-well cement-based composites. The results of this paper are helpful for the design of elastic cement slurry systems.
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spelling pubmed-93696802022-08-12 Study on an Epoxy Resin System Used to Improve the Elasticity of Oil-Well Cement-Based Composites Song, Jianjian Xu, Mingbiao Tan, Chunqin You, Fuchang Wang, Xiaoliang Zhou, Shanshan Materials (Basel) Article Oil-well cement-based materials have inherent brittleness; therefore, they cannot be directly used to seal oil and gas wells for a long time. To improve the elasticity of oil-well cement-based composites, a flexible epoxy resin system was developed. The flexibility, TG, and SEM of the cured resin system were evaluated. At the same time, the resin was added to oil-well cement-based materials to improve its elasticity. The compressive strength and elastic modulus of resin cement stone were tested, and the microstructure was analyzed by XRD, TG, and SEM/EDS. The results showed that the structure of the cured resin is compact, the thermal decomposition temperature is 243.9 °C, and it can recover its original shape after compression. At the curing age of 28 days, the compressive strength of cement-based composites containing 30% resin decreased by 26.7%, while the elastic modulus significantly decreased by 63.2%, and the elasticity of cement-based composites was significantly improved. The formation of hydration products (e.g., calcium silicate hydrate, and calcium hydroxide) in the resin cement slurry is obviously lower than that of pure cement, which is the reason for the decrease in compressive strength. The flexible structure of polymer particles and polymer film formed by epoxy resin is distributed inside the cement stone, which significantly improves the elasticity of oil-well cement-based composites. The results of this paper are helpful for the design of elastic cement slurry systems. MDPI 2022-07-29 /pmc/articles/PMC9369680/ /pubmed/35955192 http://dx.doi.org/10.3390/ma15155258 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Song, Jianjian
Xu, Mingbiao
Tan, Chunqin
You, Fuchang
Wang, Xiaoliang
Zhou, Shanshan
Study on an Epoxy Resin System Used to Improve the Elasticity of Oil-Well Cement-Based Composites
title Study on an Epoxy Resin System Used to Improve the Elasticity of Oil-Well Cement-Based Composites
title_full Study on an Epoxy Resin System Used to Improve the Elasticity of Oil-Well Cement-Based Composites
title_fullStr Study on an Epoxy Resin System Used to Improve the Elasticity of Oil-Well Cement-Based Composites
title_full_unstemmed Study on an Epoxy Resin System Used to Improve the Elasticity of Oil-Well Cement-Based Composites
title_short Study on an Epoxy Resin System Used to Improve the Elasticity of Oil-Well Cement-Based Composites
title_sort study on an epoxy resin system used to improve the elasticity of oil-well cement-based composites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9369680/
https://www.ncbi.nlm.nih.gov/pubmed/35955192
http://dx.doi.org/10.3390/ma15155258
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