Abstract
In Japanese coal mines the gas drainage is employed in a practical operation in order to keep low level of methane concentration in the ventilation. In 1993, gas of 44.9 million m 3 was drained and about 90% of the drained gas was used for power generation and heating. In order to evaluate the utilization possibility of coal seam gas as natural gas resources, the gas resources in Ishikari coal field was estimated. At Taiheiyo coal mine, the long-length boreholes with a length of 500m was developed and used to degas methane from the coal and rock seams. At Sorachi Coal Mine, an auto- controlled gas drainage system to control the flow rate of a gas drainage line from sealed goaf was developed and used successfully in practical operations. This paper summarizes the resources estimation of coal seam gas in Ishikari coal field and recent technologies related to the methane gas drainage in Japanese coal mines.
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