Applicability of surface directional wells for upper Silesia Basin coal seams' drainage ahead of mining

作     者：Jura Bartlomiej Skiba Jacek Wierzbinski Krystian 

作者机构：Central Mining Institute Katowice 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2014年第24卷第3期

页      面：353-362页

学科分类：0819[工学-矿业工程] 081903[工学-安全技术及工程] 08[工学] 

主　　题：Coal Methane drainage Methane hazard forecasting Numerical modeling Deposit simulation 

摘      要：Methods of exploitation drainage, which is presently applied in polish hard coal mines in Upper Silesian Coal Basin(Poland), are not effective enough, high risk of methane hazard can be observed, and production capacity of the mining plant is not fully used. Methane hazard, which may occur during planned coal exploitation, is presented in this paper. Following parameters are taken into consideration in the forecasts: coal extraction parameters, geological and mining conditions, deposit s methane saturation degree and impact of coal exploitation on the degasification coefficient of the seams, which are under the influence of relaxation zone. This paper presents the results of the analysis aiming to verify applicability of drainage ahead of mining of the coal seams by using surface directional wells. Based on the collected data(coal seams structural maps, profiles of the exploratory wells, geological cross-sections), the lab tests of drilling cores and direct wells tests, static model of the deposit was constructed and suitable grid of directional wells from the surface was designed. Comparison of forecasted methane emission volume between the two methods is investigated. The results indicated the necessity of performing appropriate deposit s stimulations in order to increase effectiveness of drainage ahead of mining.