Study on gas extraction efficiency using in-seam borehole method considering influence of plastic zone induced by borehole drilling
文献类型：期刊论文
| 作者 | Kang, Yongshui; Geng, Zhi; Liu, Bin; Chen, Jianben |
| 刊名 | GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
 |
| 出版日期 | 2023-03-01 |
| 卷号 | 33 |
| ISSN号 | 2352-3808 |
| 关键词 | Coalmine Gas extraction Gas flow Permeability Effective extraction radius |
| 英文摘要 | Gas hazards pose a serious threat to the safety of coalmines. Gas extraction through in-seam boreholes is an important technical approach for preventing gas hazards and achieving rational exploitation of gas as a clean resource. Improper extraction design may result in inefficient gas extraction and create the risk of gas emission overrun, or even coal and gas burst during mining process. Gas extraction efficiency is associated with the permeability of the coal seam, which is affected by the integrity and porosity of the coal seam. The change in permeability in plastic zones induced by borehole drilling or roadway excavation is usually not sufficiently considered when designing a gas extraction scheme and predicting the gas extraction efficiency. In view of this, this research investigated gas extraction efficiency using in-seam borehole method considering influence of drilling/excavation induced plastic zone. Based on a gas extraction project in the Huainan mining area of China, site measurements were performed to test the pressure distribution characteristics along the gas extraction pipe. Subsequently, the radius of the plastic zone around the borehole was deduced based on elastic- plastic theory. Furthermore, a gas flow equation under extraction conditions was proposed, and the apparent permeability of the coal seam was analyzed by considering the plastic deformation induced by roadway excavation and borehole drilling. Finally, a three-dimensional model was built, and the gas flow performance was simulated by considering the influence of the plastic zone. The calculated radius of the plastic zone was compared with the analytical results. The evolution characteristics of the gas pressure and the effective extraction radius were obtained. In addition, optimized measures for the design of extraction boreholes are proposed.(c) 2022 Elsevier Ltd. All rights reserved. |
| 学科主题 | Energy & Fuels ; Engineering ; Geology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000946062000001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34945]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS 2.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS; |
| 推荐引用方式 GB/T 7714 | Kang, Yongshui,Geng, Zhi,Liu, Bin,et al. Study on gas extraction efficiency using in-seam borehole method considering influence of plastic zone induced by borehole drilling[J]. GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT,2023,33. |
| APA | Kang, Yongshui,Geng, Zhi,Liu, Bin,&Chen, Jianben.(2023).Study on gas extraction efficiency using in-seam borehole method considering influence of plastic zone induced by borehole drilling.GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT,33. |
| MLA | Kang, Yongshui,et al."Study on gas extraction efficiency using in-seam borehole method considering influence of plastic zone induced by borehole drilling".GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT 33(2023). |
入库方式： OAI收割
来源：武汉岩土力学研究所
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