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- W2606562833 abstract "The author has experienced gas draining by means of the horizontal long hole method, T.ILHng last two years, in this paper, the author discussed on some factors in the operation of gas drainage by thr, s method.Conclusions were obtained as follows;(1) The frontal angle of the, fractured zone in the hanging wall of working seam is on Cr about 60°C. Gas drainage is begun when the bore hole will penetrate the front of fractured zone.(2) The relation between depression in the bore hole and quantity of drained gas at the casing head of the bore hole is almost linear from the point of practical view when the bore hole diameter s sufficiently large for the object of drainage.(3) The depression gas quantity graph is a function of the advance of long vva ffaces, ne important characteristics of this graph are obtained by the increase of the width of fractured zone, ithological disturbance around the bore hole and the crumbling of bore hole.(4) The observed thickness of spouting zone (reservoir thickness) in the hanging vvaH of working seam is about 10m, and calculated gas permeability of the fractured zone is 600-2000darcy.(5) The minimum height of drilling chamber to keep the profitable methane content in drained gas is 6-7m, the bore hole diameter is 100-120mm, and the number of bore holes is 2-3 per working face.(6) Usually, gas in working face is rather smaller in amount as compared with drciined gds. The author revealed this phenomenon by the hypothesis of “goaf-effect”." @default.
- W2606562833 created "2017-04-28" @default.
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- W2606562833 date "1961-01-01" @default.
- W2606562833 modified "2023-10-17" @default.
- W2606562833 title "On the Coal Seam Gas and Gas Draioage in the Taihelyo Coal Mine, Kushiro, Hokkaido (3rd Report)" @default.
- W2606562833 doi "https://doi.org/10.2473/shigentosozai1953.77.880_874" @default.
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