钻孔底部 borehole bottom; foot of hole
多底井钻井 multibranched drilling
海底钻井井口装置 seabed drilling gear
钻井井底深度 bottom driller
表土顿钻钻孔 spudding bit
大孔钻孔 big-diameter hole drilling
底孔钻 under-ream
顿钻井孔 cable tool drilling
多孔钻井 multiple completion
弓钻钻孔器 brace bit
精密深孔钻孔工具 precision deep hole drilling tool
井孔钻进 Hole boring; hole drilling
孔井钻探剖面 caliper log
矿井钻孔器 mine borer
扩底钻孔灌注桩 bell-out bored pile
扩底钻孔桩 under-reamed bored pile
扩孔钻井工具 expanding drilling tool
螺纹底孔钻 tap drill
盲钻井孔 blind flange