The effects of the connectors on the critical buckling load and the bending stress of pipes in horizontal section are analyzed.
分析了钻杆接头对水平井段钻柱屈曲临界力和弯曲应力的影响，提出了计算钻柱正弦屈曲临界力的新方法。
A primary formula to calculate the buckling critical load is put forward, when U-shaped bellows only subjected to bending, and will be discussed for the future.
此外，本文提出了在弯矩载荷作用下，U形波纹管膨胀节失稳临界弯矩的初步计算公式。
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