Technical characteristics of high efficient CMM drainage in Poland

Methane drainage is being performed in 23 gassy coal mines of total major 41 coal producing mines in Poland at present.The average methane drainage efficiency is 30 percent in 2004,with average utilization efficiency of 39 percent.In accordance with the coalbed methane geological condition,the gas emission feature and ventilation methods in mining districts,the techniques of intensive methane drainage from coal seams,surrounding strata and goaf so as to increase the methane drainage efficiency is introduced generally in this paper.The program of the degasification in longwall face highlights the integration of coal mining,ventilation and methane drainage.By means of optimization of the location of drill holes for drainage,the best methane drainage effect is obtained,which has been an expertise for coal mine methane control,and an important technical guarantee for sustaining coal safety production.