Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD)

Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study...
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Autor*in:	Xin Yang [verfasserIn] Gongda Wang [verfasserIn] Mingqi Ni [verfasserIn] Longyong Shu [verfasserIn] Haoran Gong [verfasserIn] Zhie Wang [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2022

Schlagwörter:	coal coal seam gas gas drainage nitrogen injection drainage injection pressure

Übergeordnetes Werk:	In: Energies - MDPI AG, 2008, 15(2022), 14, p 5064
Übergeordnetes Werk:	volume:15 ; year:2022 ; number:14, p 5064

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/en15145064

Katalog-ID:	DOAJ023816058

Internformat


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520			\|a Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N<sub<2</sub<-ECGD in underground coal mines.
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allfields	10.3390/en15145064 doi (DE-627)DOAJ023816058 (DE-599)DOAJ478069c1b7034c639cc9dead41d1c3a9 DE-627 ger DE-627 rakwb eng Xin Yang verfasserin aut Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD) 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N<sub<2</sub<-ECGD in underground coal mines. coal coal seam gas gas drainage nitrogen injection drainage injection pressure Technology T Gongda Wang verfasserin aut Mingqi Ni verfasserin aut Longyong Shu verfasserin aut Haoran Gong verfasserin aut Zhie Wang verfasserin aut In Energies MDPI AG, 2008 15(2022), 14, p 5064 (DE-627)572083742 (DE-600)2437446-5 19961073 nnns volume:15 year:2022 number:14, p 5064 https://doi.org/10.3390/en15145064 kostenfrei https://doaj.org/article/478069c1b7034c639cc9dead41d1c3a9 kostenfrei https://www.mdpi.com/1996-1073/15/14/5064 kostenfrei https://doaj.org/toc/1996-1073 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 15 2022 14, p 5064
spelling	10.3390/en15145064 doi (DE-627)DOAJ023816058 (DE-599)DOAJ478069c1b7034c639cc9dead41d1c3a9 DE-627 ger DE-627 rakwb eng Xin Yang verfasserin aut Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD) 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N<sub<2</sub<-ECGD in underground coal mines. coal coal seam gas gas drainage nitrogen injection drainage injection pressure Technology T Gongda Wang verfasserin aut Mingqi Ni verfasserin aut Longyong Shu verfasserin aut Haoran Gong verfasserin aut Zhie Wang verfasserin aut In Energies MDPI AG, 2008 15(2022), 14, p 5064 (DE-627)572083742 (DE-600)2437446-5 19961073 nnns volume:15 year:2022 number:14, p 5064 https://doi.org/10.3390/en15145064 kostenfrei https://doaj.org/article/478069c1b7034c639cc9dead41d1c3a9 kostenfrei https://www.mdpi.com/1996-1073/15/14/5064 kostenfrei https://doaj.org/toc/1996-1073 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 15 2022 14, p 5064
allfields_unstemmed	10.3390/en15145064 doi (DE-627)DOAJ023816058 (DE-599)DOAJ478069c1b7034c639cc9dead41d1c3a9 DE-627 ger DE-627 rakwb eng Xin Yang verfasserin aut Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD) 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N<sub<2</sub<-ECGD in underground coal mines. coal coal seam gas gas drainage nitrogen injection drainage injection pressure Technology T Gongda Wang verfasserin aut Mingqi Ni verfasserin aut Longyong Shu verfasserin aut Haoran Gong verfasserin aut Zhie Wang verfasserin aut In Energies MDPI AG, 2008 15(2022), 14, p 5064 (DE-627)572083742 (DE-600)2437446-5 19961073 nnns volume:15 year:2022 number:14, p 5064 https://doi.org/10.3390/en15145064 kostenfrei https://doaj.org/article/478069c1b7034c639cc9dead41d1c3a9 kostenfrei https://www.mdpi.com/1996-1073/15/14/5064 kostenfrei https://doaj.org/toc/1996-1073 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 15 2022 14, p 5064
allfieldsGer	10.3390/en15145064 doi (DE-627)DOAJ023816058 (DE-599)DOAJ478069c1b7034c639cc9dead41d1c3a9 DE-627 ger DE-627 rakwb eng Xin Yang verfasserin aut Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD) 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N<sub<2</sub<-ECGD in underground coal mines. coal coal seam gas gas drainage nitrogen injection drainage injection pressure Technology T Gongda Wang verfasserin aut Mingqi Ni verfasserin aut Longyong Shu verfasserin aut Haoran Gong verfasserin aut Zhie Wang verfasserin aut In Energies MDPI AG, 2008 15(2022), 14, p 5064 (DE-627)572083742 (DE-600)2437446-5 19961073 nnns volume:15 year:2022 number:14, p 5064 https://doi.org/10.3390/en15145064 kostenfrei https://doaj.org/article/478069c1b7034c639cc9dead41d1c3a9 kostenfrei https://www.mdpi.com/1996-1073/15/14/5064 kostenfrei https://doaj.org/toc/1996-1073 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 15 2022 14, p 5064
allfieldsSound	10.3390/en15145064 doi (DE-627)DOAJ023816058 (DE-599)DOAJ478069c1b7034c639cc9dead41d1c3a9 DE-627 ger DE-627 rakwb eng Xin Yang verfasserin aut Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD) 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N<sub<2</sub<-ECGD in underground coal mines. coal coal seam gas gas drainage nitrogen injection drainage injection pressure Technology T Gongda Wang verfasserin aut Mingqi Ni verfasserin aut Longyong Shu verfasserin aut Haoran Gong verfasserin aut Zhie Wang verfasserin aut In Energies MDPI AG, 2008 15(2022), 14, p 5064 (DE-627)572083742 (DE-600)2437446-5 19961073 nnns volume:15 year:2022 number:14, p 5064 https://doi.org/10.3390/en15145064 kostenfrei https://doaj.org/article/478069c1b7034c639cc9dead41d1c3a9 kostenfrei https://www.mdpi.com/1996-1073/15/14/5064 kostenfrei https://doaj.org/toc/1996-1073 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2119 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 15 2022 14, p 5064
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author	Xin Yang
spellingShingle	Xin Yang misc coal misc coal seam gas misc gas drainage misc nitrogen injection drainage misc injection pressure misc Technology misc T Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD)
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topic_title	Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD) coal coal seam gas gas drainage nitrogen injection drainage injection pressure
topic	misc coal misc coal seam gas misc gas drainage misc nitrogen injection drainage misc injection pressure misc Technology misc T
topic_unstemmed	misc coal misc coal seam gas misc gas drainage misc nitrogen injection drainage misc injection pressure misc Technology misc T
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title	Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD)
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title_full	Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD)
author_sort	Xin Yang
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title_sort	investigation on key parameters of n<sub<2</sub< injection to enhance coal seam gas drainage (n<sub<2</sub<-ecgd)
title_auth	Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD)
abstract	Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N<sub<2</sub<-ECGD in underground coal mines.
abstractGer	Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N<sub<2</sub<-ECGD in underground coal mines.
abstract_unstemmed	Practice shows that CO<sub<2</sub</N<sub<2</sub<-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N<sub<2</sub<-ECGD in underground coal mines.
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However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N<sub<2</sub< injection to enhance coal seam gas drainage (N<sub<2</sub<-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N<sub<2</sub<-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N<sub<2</sub< injection can significantly enhance the gas flow rate and CH<sub<4</sub< flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N<sub<2</sub< injection, which is about 2.6–3.3 times that of the conventional drainage. 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Investigation on Key Parameters of N<sub<2</sub< Injection to Enhance Coal Seam Gas Drainage (N<sub<2</sub<-ECGD)

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