钻柱是由转盘驱动的。
钻柱振动现象在钻井施工中是非常突出和明显的现象。
It is a very obvious phenomenon of the drill string vibrating in the drilling.
钻柱共振是引起深井钻具失效的主要原因。
Drill string resonance is the major cause of drill tool failure.
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。
It is significant for adjusting drill pipe sequence to improve average life of drill string.
下放钻柱至丝扣部分，拧上丝扣。
卸掉卸扣器，下放钻柱让钻头缓慢通过转盘。
Remove breaker and carefully lower bit through rotary table.
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。
Finally, the paper introduced effective control methods of common drill string vibration and deviation problem.
采用该方法可定量计算分析环空气固两相流动对钻柱和井壁的剪切作用力。
The sheer pressure of the part element can be computed quantitatively by this method.
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。
The analysis can provide reliable theory basis in order to avoiding resonance of drill string.
本节难点：钻柱失效机理分析。
Section difficulty:Mechanism analysis of column out of work.
分析了井眼中钻柱在不同工作状态下的受力情况。
Analyses the drill string's force in different working conditions.
上提钻柱至坐封深度，并记录钻柱悬重；
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；
Pick up drill string to setting depth, record hook load of the drill string;
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