本节难点：钻柱失效机理分析。
Section difficulty:Mechanism analysis of column out of work.
带扶正器下部钻柱组合的失效是钻柱失效的一种很重要的类型。
The failure of BHA with stabilizers is important among drilling string failures.
开展油田钻柱失效分析与预防对提高钻井速度、降低钻井成本及井下安全钻进具有重要意义。
It is very important for improving drilling rate, reducing drilling cost and safety drilling to carry out drill stem failure analysis and prevention.
钻柱振动是在当前钻井工程中的普遍现象，对钻井的影响很大，钻柱共振是钻柱失效的主要原因。
Drill string vibration is a common phenomenon in the process of well drilling. Drilling string resonance is the main reason of the drilling string failure.
探讨了材料强度及螺纹强度钻柱失效的影响、复杂地质条件下套管及钻柱的腐蚀疲劳寿命、以及磨损对套管钻柱失效的影响；
The influences of lacking strength of materials and screw thread are treated in this paper, as well as corrosion questions on complicated project situation.
初步确立了空气钻井钻柱冲蚀磨损机理，提出钻屑冲蚀是促使钻具失效的一项重要原因。
Establish the erosive wear mechanism of drilling string in air drilling and put forward that erosion wear is a substantial cause to promote drill string failure.
石油钻柱的失效80 %以上都为疲劳破坏，这与钻柱在弯曲和扭转组合下的交变应力有关。
The fatigue rupture made up 80 percent of the total petroleum drillstring failures, which is related to the flexural-torsional alternate stress acted on drillstring.
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.
预防钻柱螺纹失效事故发生和提高螺纹连接使用寿命的技术长期以来倍受关注。
The people pay attention on raising the span of the usage of the thread of drill collars and preventing the accident of drill string thread failure.
钻柱振动失效控制装置通过曲率段时会发生较大的弯曲变形、承受较大的弯曲应力。
Drillstring vibration control device will occur bending deformation and bear greater bending stress through the curvature.
钻柱振动失效控制装置通过曲率段时会发生较大的弯曲变形、承受较大的弯曲应力。
Drillstring vibration control device will occur bending deformation and bear greater bending stress through the curvature.
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