Research on anti-jamming drilling technology in thick coal area of soft coal seam through borehole
Yungaishan No.1 Coal Mine in the bottom drainage roadway construction during drilling through the layer strip control drilling,due to the instability of the Ⅱ1 coal seam,when the hydraulic punching in the thick coal area,the phenomenon of plugging and sticking often occurs.In severe cases,there will be a loss of drill pipe accidents,affecting the progress of gas control and increasing the cost of gas control.For this reason,the mine combined with the borehole peeper to observe the situation in the borehole,and found that the pulverized coal retained at the inflection point of the borehole trajectory affected the plugging and sticking phenomenon caused by the slag discharge channel.By using the large diameter drill bit+centralizer,the gap between the drill pipe and the hole wall is increased,which can effectively solve the problem of plugging during coal punching,and at the same time minimize the deviation of the borehole trajectory.
万方数据
维普
