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Research on Borehole Construction Process of Ground Gas Drainage in Tunlan Coal Mine
Author(s): 
Pages: 53-54+57
Year: Issue:  3
Journal: Coal Engineering

Keyword:  large apertureground gas drainage boreholecavity expansiononce-through drillingborehole construction process;
Abstract: According to characteristics of the No. 3 ground gas drainage boreholes of Tunlan Coal Mine,the construction process of drainage borehole was designed,including drilling preparation,drilling,casing and pipe fixing. The maximum hole inclination of the Φ914mm,360 m gas piping shaft was 40’,final hole maximum deviation was 0. 89 m,the casing was smooth,pipe fixing quality was favorable,the construction safety requirements was satisfied and obvious economic benefit was achieved.
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