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.
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