Surface Extraction Technology of Depressurized Gas in Overlying Long Distance Coal Seams
The coal mines in Xiyang County,Shanxi Province mainly mine No.15 coal seam of Taiyuan Formation,while the No.8 and No.9 coal seams of Taiyuan Formation have the characteristics of unstable development,multiple layers,and small single-layer thickness,which are not conducive to underground mining and coalbed methane development,causing serious waste of coal and coalbed methane resources.In order to extract coalbed methane resources in thin coal seams of Taiyuan Formation,surface coalbed methane drilling was used to extract coal seams such as No.8 and No.9,which were overlaid in the mining area.The three-open well structure was used to lower the screen pipe in Taiyuan Formation and put into operation before underground mining.The daily gas output was stable above 5 000 m3,which had the characteristics of high output,stable concentration and continuous extraction.The research has important reference value and role for the regions with similar coal seam development.
mining areaoverlying seammultiple seamsurface drilling and extraction
万方数据
维普
