钻杆撞击井壁使井眼局部扩大的英文

whiout

• 钻杆:    bull rod; bar; rod ...
• 撞击:    impact; ram; dash ...
• 井壁:    wall of a well
• 使:    send; tell sb. to ...
• 井眼:    borehole; well
• 局部:    part; locality; to ...
• 扩大:    expansion; amplify ...