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中文摘要：
针对具有超长细比特征的底部钻具组合（BHA），运用有限元结点迭代方法，研究柔性短节在不同位置对带位移工作方式旋转导向工具RSBHA的三维动态变形和动态应力的影响，并且分析在不同钻压和转速情况下柔性短节位置的变化对最大动态应力的影响。结果表明：在合理的位置加入柔性短节能够减小RSBHA的横向动态位移．并且使得最大动态应力明显下降，起到减振的效果，反之将会明显增加动态应力；柔性短节位置对最大动态应力的影响远大于钻压和转速，合理地确定柔性短节位置对提高井下工具的安全性和测量数据的准确性有重要作用。
英文摘要：
Devoted to the large slenderness ratio of bottom hole assembly（ BHA）, the finite element iteration method was used to analyze the effect of flex sub＇s position on the 3D dynamic deformation and dynamic stress, and the effect of flex sub＇s po- sition on the maximal dynamic stress under different weight on bit and speed was also analyzed. The results show that the lat- eral dynamic displacement and the maximum dynamic stress in RSBHA can be decreased obviously if the flex sub is put in a reasonable position, then the shock absorption effect of RSBHA can be increased. On the contrary, if the flex sub is put in an unreasonable position, the dynamic stress will significantly increase. The flex sub＇s position has more impact on the maxi- mum dynamic stress in RSBHA than weight on bit and speed, and how to determine the flex sub＇s position reasonably is im- portant for improving the security of well tools and the accuracy of measurement data.
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