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为揭示钻孔内残留煤渣阻碍封孔器移动的作用机制,寻求最佳的降阻方法,首先,设计封孔器在煤层钻孔内移动的试验方案及装置,并开展7种不同端头锥面角度的封孔器在模拟钻孔内的移动试验;然后,分析封孔器前方的煤渣堆积状态及其移动阻力参数;最后,基于试验结果,解释炸药和封孔器在煤层钻孔内的堵塞现象,改进钻孔瓦斯涌出初速度测定装备的封孔器。结果表明,随着封孔器向前移动,封孔器前方的煤渣堆积长度和高度逐步增加,封孔器所受的阻力几乎呈指数规律增加;如果封孔器的端头锥面角度较大,就会被堆积的煤渣完全堵塞;随着封孔器端头锥面角度的减小,封孔器所受阻力逐步降低,并趋于稳定;改进型封孔器(前端安装锥面角度为20°的空心罩)的送入阻力小、推进速度快,送入钻孔深度大。
In order to reveal the mechanism of the residual cinder in the borehole impeding the movement of the plugging device, the best method of drag reduction is proposed. First, the experimental scheme and device for the movement of the plugging device in the borehole of the coal seam are designed and seven different kinds of tip cone Surface angle of the hole in the hole drilling test; then, analyze the state of accumulation of cinder in front of the hole and moving resistance parameters; and finally, based on the test results, explain the explosives and the hole in the hole Plugging phenomenon to improve the drilling gas emission rate of the initial determination of the device sealing device. The results show that as the sealer moves forward, the length and height of cinder buildup in front of the sealer gradually increase, and the resistance of the sealer increases almost exponentially. If the sealer’s end taper angle is larger , The clinker will be completely clogged. As the angle of the conical surface of the plugging tip decreases, the resistance of the plugging device gradually decreases and tends to be stable. The improved plugging device 20 ° hollow cover) into the resistance of small, fast-forward, into the drilling depth.