1·The drill string is rotated by rotary table.
钻柱是由转盘驱动的。
2·The drill string may be thousands of feet long.
钻具的长度可达数千英尺。
3·Lower drill string to top of pin and engage threads.
下放钻柱至丝扣部分，拧上丝扣。
4·The driller sets the drill string in the slips or elevator.
司钻把钻具坐在卡瓦或吊卡上。
5·Drill string resonance is the major cause of drill tool failure.
钻柱共振是引起深井钻具失效的主要原因。
6·It is a very obvious phenomenon of the drill string vibrating in the drilling.
钻柱振动现象在钻井施工中是非常突出和明显的现象。
7·Saltwater mud is known to have a very strong corroding effect on drill string.
人们知道，盐水泥浆对钻具有很强的腐蚀作用。
8·The riser's inner hollow core (a pipe within a pipe) is reserved for the drill string.
立管内部核心是空心的(管中管)，留给钻柱使用。
9·You must keep trying to find a new way to protect the drill string from sticking.
你们应当坚持设法找出防止钻具被卡的新方法。
10·The rotary carriage provides rotary and vertical motion to the drill string and bit.
转动滑架为钻柱和钻头提供转动和垂直移动。