1. Study on formation mechanism of gas emission partition in hydraulic flushing coal seam.
- Author
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Wang Xin-Xin, Shi Bi-Ming, and Mu Chao-Min
- Subjects
- *
STRAINS & stresses (Mechanics) , *COALBED methane , *GAS distribution , *PERMEABILITY , *COAL - Abstract
In order to search for the gas distribution in the coal seam after hydraulic flushing, introduced a hydraulic flushing field test on the investigation of gas pressure based on Pansan No. 13-1 coal seam occurrence condition. By using RFPA2D-Flow software to simulate the process of coal fracture with hydraulic flushing, studied the effects of hydraulic flushing in seam stress and gas pressure distribution. The results indicate that hydraulic flushing pressure-relief and permeability is a process of the coal around punching holes and rebuild its unstable equilibrium. Around the holes from near and far would form four regions: gas full emission region, gas emission region, gas pressure transition region and natural gas region. The coal in the pressure-relief and permeability region could experience the processes of stress increase, fracture development, stress quick release and recovery equilibrium. [ABSTRACT FROM AUTHOR]
- Published
- 2012