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。
The effects of the connectors on the critical buckling load and the bending stress of pipes in horizontal section are analyzed.
分析了连续管钻杆弯曲状态的各种影响因素及影响程度。
The affecting factors and degrees on the bending of coiled tubing drill pipe are analyzed.
与给出的不同工况下单根钻杆弯曲应力峰峰值实测曲线的对比证明，理论分析是正确的。
The theoretical analysis is proved to be correct by the measured characteristics under different working conditions.
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.
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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