Percussive-Rotary Drilling
rotary percussive drilling
wire-line coring and percussive rotary drilling technology
percussive-rotary guided boring
rotary-percussive drill
vibratory percussive drilling
all casing rotary drilling
normal-circulation rotary drilling
percussion-rotary drilling
reverse-circulation rotary drilling
ROTARY DRILLING
旋转钻井法
回转钻探
回转钻进
旋转钻进
旋挖钻进
旋挖成孔
旋转钻机
旋转式钻探
旋转钻井
旋挖成孔灌注桩
rotary drilling buckets
Rotary Drilling Cast-in-place Pile
Rotary drilling machine