Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal Seam
This paper presents the results of an evaluation study of gas drainability in the Bulli seam in the Southern Coalfield of the Sydney Basin, NSW, Australia, where the coal seam gas (CSG) contains a high proportion of carbon dioxide (CO2). Historically the gas drainability in some particular areas of...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2019/3481834 |
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| author | Lei Zhang Ting Ren Naj Aziz Cun Zhang |
| author_facet | Lei Zhang Ting Ren Naj Aziz Cun Zhang |
| author_sort | Lei Zhang |
| collection | DOAJ |
| description | This paper presents the results of an evaluation study of gas drainability in the Bulli seam in the Southern Coalfield of the Sydney Basin, NSW, Australia, where the coal seam gas (CSG) contains a high proportion of carbon dioxide (CO2). Historically the gas drainability in some particular areas of this coal seam was found to be particularly poor, which posed a significant challenge to gas predrainage. As a result, a large volume of greenhouse gases were released to the atmosphere during mining of the coal seam. Furthermore, the high gas content associated with the CO2-rich composition also increased the risks of coal and gas outburst incidents, affecting the safety of mining. After systematic literature review of evaluation factors affecting gas drainability, this evaluation study comprehensively analyzed the main critical factors, including the geology of the area, the coal cleat system, coal microstructure, coal permeability, coal sorption capacity, gas content, and gas composition. Field geology analysis showed geological variations that affected the variations of the coal cleat system and CO2 content in the coal seam. Scanning Electron Microscope (SEM) tests showed the tight and less-porous features in hard-to-drain coal samples. The colliery gas database analysis was carried out to assess the impact of gas content and gas composition on the drainability of the coal seam. Laboratory tests showed that the coal seam had a permeability of less than 1 mD and also showed that the coal seam was highly undersaturated, especially with high CO2 content. |
| format | Article |
| id | doaj-art-b3b26cdd99f94b3b98064438e9d20257 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-b3b26cdd99f94b3b98064438e9d202572025-02-03T05:53:30ZengWileyGeofluids1468-81151468-81232019-01-01201910.1155/2019/34818343481834Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal SeamLei Zhang0Ting Ren1Naj Aziz2Cun Zhang3Key Laboratory of Deep Coal Resource Mining (Ministry of Education of China), State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Civil, Mining & Environmental Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, NSW 2522, AustraliaSchool of Civil, Mining & Environmental Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, NSW 2522, AustraliaSchool of Resource and Safety Engineering, State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, ChinaThis paper presents the results of an evaluation study of gas drainability in the Bulli seam in the Southern Coalfield of the Sydney Basin, NSW, Australia, where the coal seam gas (CSG) contains a high proportion of carbon dioxide (CO2). Historically the gas drainability in some particular areas of this coal seam was found to be particularly poor, which posed a significant challenge to gas predrainage. As a result, a large volume of greenhouse gases were released to the atmosphere during mining of the coal seam. Furthermore, the high gas content associated with the CO2-rich composition also increased the risks of coal and gas outburst incidents, affecting the safety of mining. After systematic literature review of evaluation factors affecting gas drainability, this evaluation study comprehensively analyzed the main critical factors, including the geology of the area, the coal cleat system, coal microstructure, coal permeability, coal sorption capacity, gas content, and gas composition. Field geology analysis showed geological variations that affected the variations of the coal cleat system and CO2 content in the coal seam. Scanning Electron Microscope (SEM) tests showed the tight and less-porous features in hard-to-drain coal samples. The colliery gas database analysis was carried out to assess the impact of gas content and gas composition on the drainability of the coal seam. Laboratory tests showed that the coal seam had a permeability of less than 1 mD and also showed that the coal seam was highly undersaturated, especially with high CO2 content.http://dx.doi.org/10.1155/2019/3481834 |
| spellingShingle | Lei Zhang Ting Ren Naj Aziz Cun Zhang Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal Seam Geofluids |
| title | Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal Seam |
| title_full | Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal Seam |
| title_fullStr | Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal Seam |
| title_full_unstemmed | Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal Seam |
| title_short | Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal Seam |
| title_sort | evaluation of coal seam gas drainability for outburst prone and high co2 containing coal seam |
| url | http://dx.doi.org/10.1155/2019/3481834 |
| work_keys_str_mv | AT leizhang evaluationofcoalseamgasdrainabilityforoutburstproneandhighco2containingcoalseam AT tingren evaluationofcoalseamgasdrainabilityforoutburstproneandhighco2containingcoalseam AT najaziz evaluationofcoalseamgasdrainabilityforoutburstproneandhighco2containingcoalseam AT cunzhang evaluationofcoalseamgasdrainabilityforoutburstproneandhighco2containingcoalseam |