管下扩眼偏心钻头
eccentric underreaming bit
三点式近钻头扩眼器
three point neat-bit reamer
three point near-bit reamer
三点式井底扩眼器
three point bottom hole reamer
三点式稳定扩眼器
three point stabilized reamer
三点式旋转扩眼器
three point rotary reamer
三点式钻柱扩眼器
three point string reamer