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Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants

[Image: see text] This paper investigates the unclear influence mechanism of the surfactant effect on improving coal seam wettability and CO(2)-enhanced coalbed methane technology to enhance the gas extraction efficiency in some coal mines under highly mineralized environments in China. Specifically...

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Autores principales: Liu, Hongyong, Li, Zhen, Zheng, Chunshan, Wang, Yushan, Song, Fei, Meng, Xiangfei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10601071/
https://www.ncbi.nlm.nih.gov/pubmed/37901488
http://dx.doi.org/10.1021/acsomega.3c03583
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author Liu, Hongyong
Li, Zhen
Zheng, Chunshan
Wang, Yushan
Song, Fei
Meng, Xiangfei
author_facet Liu, Hongyong
Li, Zhen
Zheng, Chunshan
Wang, Yushan
Song, Fei
Meng, Xiangfei
author_sort Liu, Hongyong
collection PubMed
description [Image: see text] This paper investigates the unclear influence mechanism of the surfactant effect on improving coal seam wettability and CO(2)-enhanced coalbed methane technology to enhance the gas extraction efficiency in some coal mines under highly mineralized environments in China. Specifically, the microinfluence mechanism of the coupling effect of nonionic surfactant OP-10 and highly mineralized coal samples under special treatment on the wettability of coal seam is examined. By measuring the contact angle and surface tension of the samples, it is confirmed that high mineralization can limit the effect of surfactants on improving the wettability of coal seams to a certain point. Infrared spectroscopy and X-ray diffraction measurements were conducted on the samples under coupling conditions. It is found that high mineralization impedes the effectiveness of surfactants in enhancing the wettability of coal seams. The surfactants interact with coal samples at the functional group level, producing new hydrophilic functional groups and increasing the content of kaolin with strong hydrophilic properties, thereby increasing the wettability of coal seams. However, these hydrophilic functional groups disappear under coupling conditions and hydrophobic functional groups are produced. Additionally, high mineralization inhibits the effect of surfactants on the phase composition of coal samples. The findings of this research provide a theoretical basis for water injection of highly mineralized coal seams and methane replacement recovery by carbon dioxide technology, promoting the practical application of water injection and gas injection displacement of coal seams.
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spelling pubmed-106010712023-10-27 Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants Liu, Hongyong Li, Zhen Zheng, Chunshan Wang, Yushan Song, Fei Meng, Xiangfei ACS Omega [Image: see text] This paper investigates the unclear influence mechanism of the surfactant effect on improving coal seam wettability and CO(2)-enhanced coalbed methane technology to enhance the gas extraction efficiency in some coal mines under highly mineralized environments in China. Specifically, the microinfluence mechanism of the coupling effect of nonionic surfactant OP-10 and highly mineralized coal samples under special treatment on the wettability of coal seam is examined. By measuring the contact angle and surface tension of the samples, it is confirmed that high mineralization can limit the effect of surfactants on improving the wettability of coal seams to a certain point. Infrared spectroscopy and X-ray diffraction measurements were conducted on the samples under coupling conditions. It is found that high mineralization impedes the effectiveness of surfactants in enhancing the wettability of coal seams. The surfactants interact with coal samples at the functional group level, producing new hydrophilic functional groups and increasing the content of kaolin with strong hydrophilic properties, thereby increasing the wettability of coal seams. However, these hydrophilic functional groups disappear under coupling conditions and hydrophobic functional groups are produced. Additionally, high mineralization inhibits the effect of surfactants on the phase composition of coal samples. The findings of this research provide a theoretical basis for water injection of highly mineralized coal seams and methane replacement recovery by carbon dioxide technology, promoting the practical application of water injection and gas injection displacement of coal seams. American Chemical Society 2023-10-10 /pmc/articles/PMC10601071/ /pubmed/37901488 http://dx.doi.org/10.1021/acsomega.3c03583 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Liu, Hongyong
Li, Zhen
Zheng, Chunshan
Wang, Yushan
Song, Fei
Meng, Xiangfei
Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants
title Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants
title_full Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants
title_fullStr Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants
title_full_unstemmed Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants
title_short Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants
title_sort wettability characteristics of low-rank coals under the coupling effect of high mineralization and surfactants
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10601071/
https://www.ncbi.nlm.nih.gov/pubmed/37901488
http://dx.doi.org/10.1021/acsomega.3c03583
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