提出了一种钻柱强度计算新方法，可用于钻柱的强度设计和强度校核。
A new method for calculating drill stem strength can be applied to designing and checking strength of drill stem.
同时它还与井内压力平衡，井壁稳定，套管和钻柱强度设计密切相关。
Meanwhile, underground cycle temperature is also related to the pressure balance in a well, the stability of well bore and the design of casing and string.
在计算钻柱强度时，应考虑接头对钻杆弯曲应力的影响，以实现安全钻井。
The effect of tool joint must be considered in analysis of drillstring strength to reduce drillstring failure and keep safety in drilling process.
对处于不同工艺条件下的钻柱、套管、油管的强度设计和组合使用等均有实际意义。
It has a practical meaning for the strength design and combination usage of drill string, casing and tubing under different technological conditions.
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.
实践证明，小井眼直井钻具性能评估准则和钻柱动强度条件是正确的，有效地满足了钻井工程需要。
Practical applications show that the standard and dynamic strength conditions are correct and meet the field requirements effectively.
实践证明，小井眼直井钻具性能评估准则和钻柱动强度条件是正确的，有效地满足了钻井工程需要。
Practical applications show that the standard and dynamic strength conditions are correct and meet the field requirements effectively.
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