Prevention and treatment of bury drills during rotary drilling 旋挖钻进埋钻事故的处理实例及预防措施
2.
Analysis and disposition for an accident of drill bit being buried in large diameter drilling with non - circulation of slurry by hydraulic piling rig 某旋挖钻机大口径无循环钻进埋钻事故的分析处理