煤矿安全2024，Vol.55Issue(8)：198-205,8.DOI:10.13347/j.cnki.mkaq.20240460
封孔器锥面端头与钻孔残留煤渣的力学作用分析及应用
Analysis of mechanical action between cone end of borehole packer and coal dregs in borehole and its application
摘要
Abstract
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.关键词
瓦斯抽采钻孔/封孔器/残留煤渣/堆积煤渣/锥面端头/减阻机理Key words
gas drainage drilling holes/sealing device/coal dregs/accumulated coal dregs/cone end/drag reduction mechanism分类
矿业与冶金引用本文复制引用
姬战锁,齐黎明..封孔器锥面端头与钻孔残留煤渣的力学作用分析及应用[J].煤矿安全,2024,55(8):198-205,8.基金项目
国家自然科学基金资助项目(51204070) （51204070）
河北省自然科学基金资助项目(E2015508053) （E2015508053）
