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Methane Control in an Advancing Section of an Underground Coal Mine

机译：煤矿井下推进段的瓦斯治理

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The drilling of horizontal boreholes as a means of degasification in advance of mining was tried at the Jim Walter Resources, Inc., No. 4 Mine. In a joint venture with the Bureau of Mines, a series of horizontal drainage boreholes were drilled in the panels of an advancing continuous miner section. The combined methane gas production rate ranged from 205,000 to 680,000 cfd (cubic feet per day) with individual in-seam horizontal holes producing up to 332,000 cfd. The methane liberation from the ribs for the entire panel length decreased from an average of 8.75 cfm (cubic feet per minute) to 4.05 cfm per 100 ft of entry, a 54% reduction. The gas concentration as measured at the surface discharge point normally ranges from 85% to 95% methane. As a result of the significant reduction in methane liberation rates, a 50% increase in productivity from the section was realized.

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