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.
经现场5口井试验表明，不弯曲钻铤能够起到增大下部钻具组合刚度，控制直井段井斜的作用；
The on-site tests of 5 wells showed that the stiffness of lower drill pipe assembly was increased to control deviation in the straight hole.
套管弯曲力的定义不够严格，把弯曲力加到垂直井段是不正确的。
The definition of casing bend force is not exact, and taking the bend force into account for casing design in the vertical interval is not correct.
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