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CBM Desorption Model and Stages Based on a Natural Desorption Experiment

[Image: see text] Coalbed methane (CBM) desorption modeling is critical for understanding CBM desorption mechanisms and objectively analyzing the production characteristics of CBM wells. According to the CBM natural desorption experimental data of 64 coal samples taken from the Qinshui Basin, we est...

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Autores principales: Zhang, Zhijun, Wang, Boyang, Cui, Yunfei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9609078/
https://www.ncbi.nlm.nih.gov/pubmed/36312360
http://dx.doi.org/10.1021/acsomega.2c04350
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author Zhang, Zhijun
Wang, Boyang
Cui, Yunfei
author_facet Zhang, Zhijun
Wang, Boyang
Cui, Yunfei
author_sort Zhang, Zhijun
collection PubMed
description [Image: see text] Coalbed methane (CBM) desorption modeling is critical for understanding CBM desorption mechanisms and objectively analyzing the production characteristics of CBM wells. According to the CBM natural desorption experimental data of 64 coal samples taken from the Qinshui Basin, we established a CBM desorption model, quantitatively identified the CBM desorption stages, and discussed the relationship between CBM desorption characteristics and well productivity. The results indicated a very significant functional relationship between the CBM natural desorption time and cumulative desorption quantity, which could be accurately described by the model V = a(L)t/(t + b(L)). On the basis of this model and the numerical description of the desorption data, the CBM natural desorption process was divided into four stages: the desorption startup stage, desorption sensitive stage, desorption steady stage, and desorption decay stage. As indicated by analogical reasoning of the CBM well production process, the desorption startup stage corresponded to the drainage-based pressure drop stage, the desorption sensitive and steady stages corresponded to the steady production stage, and the desorption decay stage corresponded to the production declining stage. The CBM adsorption time exponentially decreased with the increase in the average CBM desorption rate and with the increase in the CBM gas content and vitrinite/inertinite ratio. Furthermore, within a certain range of desorption pressure, a high ratio between the adsorption time and gas content corresponded to the extension of the steady production stage of CBM wells, whereas higher or lower ratios were adverse to steady production.
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spelling pubmed-96090782022-10-28 CBM Desorption Model and Stages Based on a Natural Desorption Experiment Zhang, Zhijun Wang, Boyang Cui, Yunfei ACS Omega [Image: see text] Coalbed methane (CBM) desorption modeling is critical for understanding CBM desorption mechanisms and objectively analyzing the production characteristics of CBM wells. According to the CBM natural desorption experimental data of 64 coal samples taken from the Qinshui Basin, we established a CBM desorption model, quantitatively identified the CBM desorption stages, and discussed the relationship between CBM desorption characteristics and well productivity. The results indicated a very significant functional relationship between the CBM natural desorption time and cumulative desorption quantity, which could be accurately described by the model V = a(L)t/(t + b(L)). On the basis of this model and the numerical description of the desorption data, the CBM natural desorption process was divided into four stages: the desorption startup stage, desorption sensitive stage, desorption steady stage, and desorption decay stage. As indicated by analogical reasoning of the CBM well production process, the desorption startup stage corresponded to the drainage-based pressure drop stage, the desorption sensitive and steady stages corresponded to the steady production stage, and the desorption decay stage corresponded to the production declining stage. The CBM adsorption time exponentially decreased with the increase in the average CBM desorption rate and with the increase in the CBM gas content and vitrinite/inertinite ratio. Furthermore, within a certain range of desorption pressure, a high ratio between the adsorption time and gas content corresponded to the extension of the steady production stage of CBM wells, whereas higher or lower ratios were adverse to steady production. American Chemical Society 2022-10-12 /pmc/articles/PMC9609078/ /pubmed/36312360 http://dx.doi.org/10.1021/acsomega.2c04350 Text en © 2022 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 Zhang, Zhijun
Wang, Boyang
Cui, Yunfei
CBM Desorption Model and Stages Based on a Natural Desorption Experiment
title CBM Desorption Model and Stages Based on a Natural Desorption Experiment
title_full CBM Desorption Model and Stages Based on a Natural Desorption Experiment
title_fullStr CBM Desorption Model and Stages Based on a Natural Desorption Experiment
title_full_unstemmed CBM Desorption Model and Stages Based on a Natural Desorption Experiment
title_short CBM Desorption Model and Stages Based on a Natural Desorption Experiment
title_sort cbm desorption model and stages based on a natural desorption experiment
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9609078/
https://www.ncbi.nlm.nih.gov/pubmed/36312360
http://dx.doi.org/10.1021/acsomega.2c04350
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