分析封孔器锥面端头与钻孔残留煤渣的力学作用，有助于利用锥面端头的减阻效应，提高封孔器的送入孔深与速度。首先，在锥面端头受力分析基础上，推导了锥面端头移动最小推力计算公式，并通过试验研究验证了其正确性；然后，分析了堆积煤渣承受的侧向力，并揭示了锥面端头减阻机理；最后，应用理论研究结果，提出了锥面端头优化设计思路，改进了封孔器，并开展了现场试验。试验结果表明：锥面端头移动最小推力与端头重力、端头锥面角度、端头锥面与煤渣的最大静摩擦系数、堆积煤渣厚度和端头锥底半径均呈正相关性关系（与锥面角度呈正切函数关系）；锥面端头通过降低堆积煤渣厚度及接触面顶端堆积煤渣剪切应力实现减阻；改进型封孔器可以降低阻力、提高送入速度与孔深。

Analysis of mechanical action between cone end of borehole packer and coal residue in borehole is helpful to improve speed and depth of borehole packer movement by drag reduction effect of cone end. Firstly, on the basis of force analysis about cone end, the minimum thrust formula of cone end movement was deduced, and its correctness was verified by experimental research. Secondly, the lateral force of accumulated coal dregs was analyzed, and the drag reduction mechanism of cone end was revealed. Lastly, the thinking of cone end optimization was proposed, and borehole packer was improved, and field test has been carried out. The results show that the minimum thrust of cone end movement has a positive correlation with gravity of end, conical surface angle of end, maximum static friction coefficient between conical surface of end and coal dregs, height of accumulated coal dregs and cone base radius of end (there is a tangent function relationship between minimum thrust of cone end movement and conical surface angle). The cone end reduces the drag by reducing the thickness of accumulated dregs and the shear stress of accumulated dregs at the top of the contact surface. The improved hole packer can reduce resistance, increase feed speed and hole depth.