Optimization of the Plastic Area of a Borehole Based on the Gas Extraction Effect and Its Engineering Application

Gas extraction is most commonly used to control gas disasters in coal mines. The distribution of the plastic zone around a borehole and the sealing quality are key factors affecting gas extraction. In this paper, the plastic zone was simulated by COMSOL, and a theoretical equation of the plastic zon...

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Autores principales:	Kuan Wu, Shiliang Shi, Yi Lu, He Li, Min Li
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi-Wiley 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/8a2774c4213a4246ae03d68a621f0176
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spelling	oai:doaj.org-article:8a2774c4213a4246ae03d68a621f01762021-11-22T01:10:33ZOptimization of the Plastic Area of a Borehole Based on the Gas Extraction Effect and Its Engineering Application1468-812310.1155/2021/8147366https://doaj.org/article/8a2774c4213a4246ae03d68a621f01762021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/8147366https://doaj.org/toc/1468-8123Gas extraction is most commonly used to control gas disasters in coal mines. The distribution of the plastic zone around a borehole and the sealing quality are key factors affecting gas extraction. In this paper, the plastic zone was simulated by COMSOL, and a theoretical equation of the plastic zone radius was derived. In addition, an antispray hole equipment and the “two plugging and one injection” sealing technology were proposed. The results show that a larger borehole pore size corresponds to a larger plastic zone and larger range of pressure relief of the borehole. The error between the calculated and simulated plastic zone radii is within 1%, and the modified equation is applicable to Puxi mine. The loss and harm caused by borehole spraying are reduced by applying antispray hole equipment. By applying the “two plugging and one injection” sealing technology and phosphogypsum-based self-produced gas expansion paste material to block the borehole, the sealing quality is improved and an accurate gas mixing flow, pure flow, and concentration were obtained. As the plastic zone enlarges, the gas extraction flow gradually increases with, but the relative variation of flow first increases and subsequently decreases. Considering the safety and economy of construction, the optimal radius of the plastic zone is 64.9 mm.Kuan WuShiliang ShiYi LuHe LiMin LiHindawi-WileyarticleGeologyQE1-996.5ENGeofluids, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 Kuan Wu Shiliang Shi Yi Lu He Li Min Li Optimization of the Plastic Area of a Borehole Based on the Gas Extraction Effect and Its Engineering Application
description	Gas extraction is most commonly used to control gas disasters in coal mines. The distribution of the plastic zone around a borehole and the sealing quality are key factors affecting gas extraction. In this paper, the plastic zone was simulated by COMSOL, and a theoretical equation of the plastic zone radius was derived. In addition, an antispray hole equipment and the “two plugging and one injection” sealing technology were proposed. The results show that a larger borehole pore size corresponds to a larger plastic zone and larger range of pressure relief of the borehole. The error between the calculated and simulated plastic zone radii is within 1%, and the modified equation is applicable to Puxi mine. The loss and harm caused by borehole spraying are reduced by applying antispray hole equipment. By applying the “two plugging and one injection” sealing technology and phosphogypsum-based self-produced gas expansion paste material to block the borehole, the sealing quality is improved and an accurate gas mixing flow, pure flow, and concentration were obtained. As the plastic zone enlarges, the gas extraction flow gradually increases with, but the relative variation of flow first increases and subsequently decreases. Considering the safety and economy of construction, the optimal radius of the plastic zone is 64.9 mm.
format	article
author	Kuan Wu Shiliang Shi Yi Lu He Li Min Li
author_facet	Kuan Wu Shiliang Shi Yi Lu He Li Min Li
author_sort	Kuan Wu
title	Optimization of the Plastic Area of a Borehole Based on the Gas Extraction Effect and Its Engineering Application
title_short	Optimization of the Plastic Area of a Borehole Based on the Gas Extraction Effect and Its Engineering Application
title_full	Optimization of the Plastic Area of a Borehole Based on the Gas Extraction Effect and Its Engineering Application
title_fullStr	Optimization of the Plastic Area of a Borehole Based on the Gas Extraction Effect and Its Engineering Application
title_full_unstemmed	Optimization of the Plastic Area of a Borehole Based on the Gas Extraction Effect and Its Engineering Application
title_sort	optimization of the plastic area of a borehole based on the gas extraction effect and its engineering application
publisher	Hindawi-Wiley
publishDate	2021
url	https://doaj.org/article/8a2774c4213a4246ae03d68a621f0176
work_keys_str_mv	AT kuanwu optimizationoftheplasticareaofaboreholebasedonthegasextractioneffectanditsengineeringapplication AT shiliangshi optimizationoftheplasticareaofaboreholebasedonthegasextractioneffectanditsengineeringapplication AT yilu optimizationoftheplasticareaofaboreholebasedonthegasextractioneffectanditsengineeringapplication AT heli optimizationoftheplasticareaofaboreholebasedonthegasextractioneffectanditsengineeringapplication AT minli optimizationoftheplasticareaofaboreholebasedonthegasextractioneffectanditsengineeringapplication
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Optimization of the Plastic Area of a Borehole Based on the Gas Extraction Effect and Its Engineering Application

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