Research on technology of bedding hole in undulating thin coal seam
The occurrence conditions of coal seams in the southern region of China are complex,with thin coal seams and significant changes in dip angles.Conventional drilling techniques cannot effectively meet the requirements of working face bedding hole construc-tion,and there is a white zone of goaf extraction.In order to eliminate the blind area of extraction of the No.111601 working face of Feitian Coal Mine,this article conducted experimental research on the construction process of bedding holes in the No.111601 working face.This experiment adopted two construction techniques,namely the combination of stabilizer straightening drilling tool assembly and directional drilling,and analyzed the deviation law and coal seam occurrence conditions based on the drilling trajectory.Field tests show that a single straightening drilling tool combination cannot meet the purpose of eliminating blind area of extraction.The directional drill-ing process can adapt to the undulation of coal seams through the construction of branch holes,covering the entire width of the working face from one side of the drilling,effectively eliminating the blind area of extraction in the middle of the working face,which has a guid-ing role for the subsequent drainage drilling construction of the working face.
bedding holegas controlblind area of extractionstraightening drilling tool assemblydirectional drilling
万方数据
维普
