Optimization of Directional Long Boreholes Unloading Gas Extraction Process and Application Research DOI Creative Commons
Chunhua Zhang, Yuqi Li

Applied Sciences, Journal Year: 2024, Volume and Issue: 15(1), P. 230 - 230

Published: Dec. 30, 2024

In order to optimize the pressure relief gas extraction process for 1504 working face in East 2 of Dalong Coal Mine based on its mining and conditions, a physical model airspace using two preliminary processes—a high-level oblique borehole directional long borehole—was established COMSOL 6.2 software. The changes effect boreholes were analyzed through simulation advancement face, reasons low utilization rate outlined. effects horizontal distance from side air return lane, spacing, negative analyzed, was optimized applied field. results showed that had better effect, higher rate, superior cost savings, thus preferred process. Additionally, optimal parameters 30 m spacing between boreholes, 20 kPa pressure.

Language: Английский

Study on the design of gas extraction drilling angle of crossing coal layer drilling in the floor rock roadway considering the boreholes superposition effect DOI

Siqi Zhang,

Zhaofeng Wang, Yimeng Zhao

et al.

Fuel, Journal Year: 2024, Volume and Issue: 378, P. 132981 - 132981

Published: Sept. 2, 2024

Language: Английский

Citations

2
Numerical simulation analysis of effect of borehole gas extraction under fluid‐structure interaction DOI Creative Commons
Lin Wang,

Ziyao Yang,

Xiangjun Chen

et al.

Energy Science & Engineering, Journal Year: 2024, Volume and Issue: 12(11), P. 5185 - 5199

Published: Oct. 9, 2024

Abstract To study the effect of coal pressure on gas extraction under fluid‐solid coupling, radius different pore sizes and treatment methods was simulated by using COMSOL Multiphysics software, time evolution law surface obtained, numerical simulation results were verified observation flow rate concentration in experimental mine combined with interaction. The show that distance increases increase borehole diameter, relation between is a power function, but gets smaller until it becomes zero. For Φ98 mm Φ120 borehole, hydraulic can efficiency 31.3% 22.7%, respectively. conventional treatment, ratio drainage enlarging hole size 6.3% 13.8% Compared areas without four conditions, descending speed from fast to slow flushing treatment. after 180 days decreased 75.3% within reasonable spacing. At same time, multi‐hole pumping, influence area adjacent larger than single‐hole spacing should be less twice pumping.

Language: Английский

Citations

0
Failure and Permeability Characteristics of Coal Pillar in Closely Coal Seams Gob Under Multiple Mining DOI Open Access

Hui Qiao,

Song Liu, Lei Dong

et al.

Processes, Journal Year: 2024, Volume and Issue: 12(12), P. 2934 - 2934

Published: Dec. 22, 2024

Coal pillars are loaded and unloaded repeatedly when mining, which lead to fractures in the coal close, open, generate expand. As a result, permeability of is changed. The high rock between upper gobs lower working faces main channels for fresh air entering gob, could induce spontaneous combustion gob. To identifying leakage channels, multiple mining closely seams was numerically conducted with three face layouts. failure characteristic pillar gob under were obtained analyzed. When mined, vertical stress horizontal load unload synchronously all laterally directed zero due no confine on lateral side pillar. middle loads continuously until mined. seam damage shear tension. staggered from face, increases more than 22000 times tension channel flowing into provides favorable conditions

Language: Английский

Citations

0
Optimization of Directional Long Boreholes Unloading Gas Extraction Process and Application Research DOI Creative Commons
Chunhua Zhang, Yuqi Li

Applied Sciences, Journal Year: 2024, Volume and Issue: 15(1), P. 230 - 230

Published: Dec. 30, 2024

In order to optimize the pressure relief gas extraction process for 1504 working face in East 2 of Dalong Coal Mine based on its mining and conditions, a physical model airspace using two preliminary processes—a high-level oblique borehole directional long borehole—was established COMSOL 6.2 software. The changes effect boreholes were analyzed through simulation advancement face, reasons low utilization rate outlined. effects horizontal distance from side air return lane, spacing, negative analyzed, was optimized applied field. results showed that had better effect, higher rate, superior cost savings, thus preferred process. Additionally, optimal parameters 30 m spacing between boreholes, 20 kPa pressure.

Language: Английский

Citations

0