Experimental study and field application of hydraulic flushing technology in soft coal seam
Abstract To enhance the safety of coal mining operations and improve the efficiency of gas extraction, hydraulic flushing technology has been widely used in low permeability coal seams. This study aims to investigate the mechanism of hydraulic flushing by conducting experiments focusing on four aspe...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-87683-4 |
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| author | Xun Zhao Bei Hu Baisheng Nie Xianfeng Liu Dan Zhao Hongsheng Li Chuan Deng Zhengpeng Duan |
| author_facet | Xun Zhao Bei Hu Baisheng Nie Xianfeng Liu Dan Zhao Hongsheng Li Chuan Deng Zhengpeng Duan |
| author_sort | Xun Zhao |
| collection | DOAJ |
| description | Abstract To enhance the safety of coal mining operations and improve the efficiency of gas extraction, hydraulic flushing technology has been widely used in low permeability coal seams. This study aims to investigate the mechanism of hydraulic flushing by conducting experiments focusing on four aspects: sample strength, punching pressure, punching position and vibration direction. The results show that an increase in hydraulic flushing pressure leads to a deeper impact groove, whereas higher sample strength results in a shallower groove. Additionally, the amplitude of stress wave is positively correlated with the density of the sample, with low-strength samples exhibiting extensive stress wave propagation and minimal attenuation. The stress wave vibration is multi-directional, which can maximize the instability and destruction of the internal structure of the coal body. To validate the practical efficacy of hydraulic flushing, a field test was conducted at the Yuwu Coal Mine in Changzhi City, Shanxi Province. The field trial shows that the effective influence radius of hydraulic flushing can reach 4 m, with a significantly lower gas flow attenuation coefficient compared to ordinary borehole. Notably, the permeability of coal seam in hydraulic flushing area is close to twice that of ordinary drilling area. |
| format | Article |
| id | doaj-art-4a97285f2d374b6996d24221798c3b40 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-4a97285f2d374b6996d24221798c3b402025-02-02T12:17:20ZengNature PortfolioScientific Reports2045-23222025-01-0115112610.1038/s41598-025-87683-4Experimental study and field application of hydraulic flushing technology in soft coal seamXun Zhao0Bei Hu1Baisheng Nie2Xianfeng Liu3Dan Zhao4Hongsheng Li5Chuan Deng6Zhengpeng Duan7Guizhou Institute of Technology Institute of Mining Engineering, Guizhou Institute of TechnologyState Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing UniversityState Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing UniversityState Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing UniversitySchool of Emergency management and Safety Engineering, China University of Mining and Technology (Beijing)Guizhou Mining Safety Science Research Institute Co., LtdGuizhou Institute of Technology Institute of Mining Engineering, Guizhou Institute of TechnologyGuizhou Mining Safety Science Research Institute Co., LtdAbstract To enhance the safety of coal mining operations and improve the efficiency of gas extraction, hydraulic flushing technology has been widely used in low permeability coal seams. This study aims to investigate the mechanism of hydraulic flushing by conducting experiments focusing on four aspects: sample strength, punching pressure, punching position and vibration direction. The results show that an increase in hydraulic flushing pressure leads to a deeper impact groove, whereas higher sample strength results in a shallower groove. Additionally, the amplitude of stress wave is positively correlated with the density of the sample, with low-strength samples exhibiting extensive stress wave propagation and minimal attenuation. The stress wave vibration is multi-directional, which can maximize the instability and destruction of the internal structure of the coal body. To validate the practical efficacy of hydraulic flushing, a field test was conducted at the Yuwu Coal Mine in Changzhi City, Shanxi Province. The field trial shows that the effective influence radius of hydraulic flushing can reach 4 m, with a significantly lower gas flow attenuation coefficient compared to ordinary borehole. Notably, the permeability of coal seam in hydraulic flushing area is close to twice that of ordinary drilling area.https://doi.org/10.1038/s41598-025-87683-4Hydraulic flushingStress waveBoreholeGas extractionPermeability |
| spellingShingle | Xun Zhao Bei Hu Baisheng Nie Xianfeng Liu Dan Zhao Hongsheng Li Chuan Deng Zhengpeng Duan Experimental study and field application of hydraulic flushing technology in soft coal seam Scientific Reports Hydraulic flushing Stress wave Borehole Gas extraction Permeability |
| title | Experimental study and field application of hydraulic flushing technology in soft coal seam |
| title_full | Experimental study and field application of hydraulic flushing technology in soft coal seam |
| title_fullStr | Experimental study and field application of hydraulic flushing technology in soft coal seam |
| title_full_unstemmed | Experimental study and field application of hydraulic flushing technology in soft coal seam |
| title_short | Experimental study and field application of hydraulic flushing technology in soft coal seam |
| title_sort | experimental study and field application of hydraulic flushing technology in soft coal seam |
| topic | Hydraulic flushing Stress wave Borehole Gas extraction Permeability |
| url | https://doi.org/10.1038/s41598-025-87683-4 |
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