Application Research of Kilometer-directional Drill in High Gas Treatment of a Mine
In a mine in Shanxi Province,the gas treatment in the early working face is pre-pumping by drilling along the seam,and upper corner gas extraction by drilling and intubation at the high level.The gas treatment engineering cycle is 5 months.In order to optimize the construction period of gas control proj-ect,kilometer directional drilling technology is used for pre-pumping before mining,and the extraction radi-us is numerically simulation.The results shows that the extraction radius of kilometer directional drilling is 5 times that of ordinary drilling at 15 days.The later field investigation and analysis show that the period of the extraction project is shortened by 4 months during the mining,and the treatment effect is remarkable.The gas concentration in the corner of the 2311 fully mechanized caving surface and the return air roadway is low-er than 1%during the mining.The comprehensive analysis shows that the gas control effect of kilometer-di-rectional drilling is remarkable,the extraction efficiency and construction efficiency are greatly improved,the engineering amount is greatly reduced,there is no need to build high level drilling,and the drilling"one hole for two purposes"is realized.
high gas minekilometer-directional drillnumerical simulationone hole for two pur-poses
万方数据
维普
