Variation in gas drainage rate from a coal seam during mining

Gas flow patterns during draining of gas from a coal seam during mining are discussed.The coal seam is treated as a dual medium with both pores and cracks.The seepage,diffusion,and desorption processes are treated using a gas flow equation that describes flow around drill holes.MATLAB is used to sol...

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Bibliographic Details
Published in矿业科学技术学报：英文版 no. 6; pp. 849 - 852
Main Author Li Gang Qi Qingxin Li Hongyan Fan Xisheng
Format Journal Article
LanguageEnglish
Published 2012
Subjects
and
cracks
Double
drainage
Gas
media
Mining
Permeability
pores
process
with
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Summary:Gas flow patterns during draining of gas from a coal seam during mining are discussed.The coal seam is treated as a dual medium with both pores and cracks.The seepage,diffusion,and desorption processes are treated using a gas flow equation that describes flow around drill holes.MATLAB is used to solve the differential equations.The permeability tracer test results from a mined coal seam are used to study the variation in gas drainage from a coal seam during mining.The results show that mining can increase the permeability of a coal seam,which then increases the gas drainage.There are inflection points in this variation over time.A close relationship between this variation and the rate of change in coal seam permeability is observed.
Bibliography:32-1827/TD
ISSN:2095-2686