Application of High-Pressure Water Jet Reaming and Permeability Increasing Technology in Outburst Coal Seam Mining
High-pressure water jet reaming and permeability enhancement technology is a widely used technology in the field of coal mining, especially in the mining of low-permeability soft outburst coal seams. This technology can effectively improve the permeability of coal seams and reduce the safety risk in...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/adce/8782969 |
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| Summary: | High-pressure water jet reaming and permeability enhancement technology is a widely used technology in the field of coal mining, especially in the mining of low-permeability soft outburst coal seams. This technology can effectively improve the permeability of coal seams and reduce the safety risk in the mining process. The purpose of this paper is to discuss the application and effect of high-pressure water jet reaming and permeability-increasing technology in the mining of low-permeability soft outburst coal seams. ANSYS is used to simulate the rotating jet, and the three-dimensional modeling of the nozzles is carried out to study the influence of the impeller guide angle on the jet diffusion angle. Considering the diffusion angle and hydraulic energy loss of the jet, it is considered that the impeller guide angle of 45° is more suitable for field application requirements. The influence of jet distance on the punching effect of a high-pressure rotating water jet was studied by laboratory experiments. By analyzing the relationship between rock-breaking depth, reaming diameter, and jet distance, the rock-breaking depth and reaming diameter decreased with the increase of jet distance under submerged conditions. The best structural characteristics of the high-pressure rotary water jet nozzle were identified by numerical modeling and laboratory testing, and the equipment and technology for safety assurance were matched. The implementation of three-dimensional high-pressure jet reaming and slotted permeability-increasing technology in engineering may greatly enhance the pure gas flow and gas concentration during the extraction of gas from low-permeability coal seams. It accomplishes the purpose of raising permeability and coalbed methane generation in low-permeability coal seams and has a clear strengthening extraction impact. |
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| ISSN: | 1687-8094 |