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Optimization of Process Parameters and Application of Along Seam Long Drilling Used for Pre-pumping Coal Seam Gas

Author: HuShouTao
Tutor: LiuMingJu；LiuYanWei
School: Henan Polytechnic University
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: BEDDING long borehole Outburst Prevention Measures Low permeability coal seam Relief AR Numerical Simulation
CLC: TD712.6
Type: Master's thesis
Year: 2011
Downloads: 115
Quote: 0
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Abstract


Huainan Mining (Group) Company-owned coal mining depth basic enter-600m deep after ground stress and gas pressure increases caused by increased gas content, the seam permeability coefficient decreases, leading to increasingly serious and complex problem of coal and gas outburst the problem to Panyi Pansan mine to test mine, using theoretical analysis, site visits and numerical simulation methods such as the key technology to carry out the BEDDING long drilling outburst prevention, and ultimately to reduce the amount of construction to improve drainage rate shorten the cycle of consumer sudden, to achieve the purpose of safe and rapid excavation. BEDDING long borehole outburst prevention measures is to take the measures to slow down the earth stress, achieve relief AR effect; the Gas Drainage reduce gas power and release gas potential; expand the scope of the relief area to to eliminate seam prominent risk . After the implementation of the the BEDDING long drilling measures, including gas coal-rock work ahead of stress equilibrium is destroyed, concentrated stress transfer to the coal deep relief with the width larger relief with prominent risk relations calculated small set mine 11-2 seam minimum anti-sudden relief width of 4.4 ~ 7.7m. BEDDING long drill application of multi-physics coupling simulation software COMSOL-Multiphysics different aperture hole depth case, the distribution of gas pressure difference and two holes, different hole spacing arranged on gas distribution, the following conclusions: With the aperture and hole depth increases, the control range of the hole increases, but the gradient increases gradually decreases, unicellular case, the radius of the drilling control up drilling around each side of 2.13m; in the two holes , the hole spacing of 2m, the rate of decline of gas pressure over the hole spacing of 3m faster, and eliminate conflict more fully. BEDDING long drilling measures in the application and effect of Panyi and Pansan mine visits, gas pre-pumping rate of over 30% after the implementation of the measures, the residual gas content of the test points down to start suddenly content following footage increased nearly 2-fold slower rate than the measures before Panyi and Pan indicator of the efficiency of the three mine inspection without an excessive. Problems exist for the evaluation of the mining side against Outburst using laboratory simulation, historical data, field data investigated to determine the 11-2 coal seam beginning sudden gas parameters: gas pressure threshold to determine 0.74MPa, residual gas content extraction indicators The critical value of 4.50m3 / t. Through the above research, theory analysis Removing Outburst Mechanism of a the BEDDING long drilling measures; BEDDING long of borehole construction process gas distribution determined by numerical simulation, and lay the foundation for the rational arrangement of drilling; BEDDING long drilling outburst prevention measures in Panyi Pansan mine application, practical application, the BEDDING long drilling can be achieved effectively eliminate the the outburst danger, to achieve the purpose of safe and rapid excavation.

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CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine atmosphere > Mine Gas > Gas Drainage
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