The drill string is rotated by rotary table.
钻柱是由转盘驱动的。
The drill string may be thousands of feet long.
钻具的长度可达数千英尺。
Lower drill string to top of pin and engage threads.
下放钻柱至丝扣部分，拧上丝扣。
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。
Pick up drill string to setting depth, record hook load of the drill string;
上提钻柱至坐封深度，并记录钻柱悬重；
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。
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。
Analytical technology for drill string stress wave spectral is a brand-new field.
柱应力波频谱分析技术是一个崭新的技术领域。
It is significant for adjusting drill pipe sequence to improve average life of drill string.
该研究结果对于现场提高钻柱的平均使用寿命具有重要的工程理论指导意义。
The analysis can provide reliable theory basis in order to avoiding resonance of drill string.
该分析为水平井钻井工程避免钻柱共振提供了可靠的理论依据。
Although the structure of drill string seems simple, it bears rather complicated outside force.
虽然钻杆柱在结构上看似较为简单，但实际上，它承受着相当复杂的外力。
Finally, the paper introduced effective control methods of common drill string vibration and deviation problem.
最后对常见的钻柱振动和井斜问题介绍了有效的控制方法。
What is the drill pipe string weight in air?
钻杆在空气中的重量是多少？
What is the drill pipe string weight in air?
钻杆在空气中的重量是多少？
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