scholarly journals Improvement of Gas Drainage Efficiency of Low-Permeability Coal Seams Using Ultra-High Pressure Hydraulic Cutting Technique

2019 ◽  
Vol 472 ◽  
pp. 012084 ◽  
Author(s):  
Yongjiang Zhang
Keyword(s):  
High Pressure ◽  
Low Permeability ◽  
Coal Seams ◽  
Gas Drainage ◽  
Ultra High Pressure

scholarly journals Engineering Practice of Ultra-high Pressure Hydraulic Slotting and Pressure Relief Pumping in Through Layer Hole

2021 ◽  
Vol 236 ◽  
pp. 01029
Author(s):  
Siqian Li
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
High Efficiency ◽  
Engineering Practice ◽  
Pressure Relief ◽  
Gas Drainage ◽  
Thick Coal Seam ◽  
Ultra High Pressure ◽  
Drainage Rate ◽  
Gas Control

In order to solve the problems of low gas drainage rate and long drainage time in thick coal seam with low permeability, ultra-high pressure hydraulic slotting pressure relief and permeability enhancement technology was applied in the test. The practice shows that after adopting the ultra-high pressure hydraulic slotting, the gas drainage rate is greatly improved, the time for reaching the standard of drainage is shortened, and the difficult problem of gas control in the mining face of thick coal seam is solved, which provides technical guidance for high-efficiency gas control in thick coal seam with similar conditions in mining area.

Numerical Study on Shocking Coal Seam of Multi-Points Explosion with High-Pressure Gas

2012 ◽  
Vol 524-527 ◽  
pp. 450-454
Author(s):  
Kun Gao ◽  
Ji Ren Wang ◽  
Bao Shan Jia
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Percolation Theory ◽  
Gas Permeability ◽  
Numerical Study ◽  
Pressure Change ◽  
Gas Pressure ◽  
Low Permeability ◽  
Gas Extraction ◽  
Coal Seams

The permeability of coal seam is an important parameter for the gas extraction and gas outburst control. However, most of the coal seams are low-permeability with outstanding characteristic in China. Therefore，it is a good technology to provide the theoretical basis for increasing the permeability of low-gas- permeability coal seam by shocking with high-pressure air. Based on the percolation theory of porous media and combining the gas pressure change after shocking the coal seam with high-pressure air, the solid-gas coupled mathematical model is presented for the flow in the coal seam. By applying the software, the numerical simulation is computed and analyzed for the gas pressure evolution owing to the multi-spot continuous shocking the coal seam by the high-pressure air under the different pressure values and strata pressure.

Dynamic effects of high-pressure pulsed water jet in low-permeability coal seams

2009 ◽  
Vol 15 (3) ◽  
pp. 284-288 ◽  
Author(s):  
Xiao-hong Li ◽  
Dong-ping Zhou ◽  
Yi-yu Lu ◽  
Yong Kang ◽  
Yu Zhao ◽  
...  
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Low Permeability ◽  
Dynamic Effects ◽  
Coal Seams ◽  
Pulsed Water Jet
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