引用本文: 罗敏, 董小娜, 徐亭亭, 李巧珍. 半铰接柔性钻具模型建立及载荷传递规律研究1)[J]. 力学与实践, 2018, 40(6): 666-670.
LUO Min, DONG Xiaona, XU Tingting, LI Qiaozhen. MODEL ESTABLISHMENT AND LOAD TRANSFER OF SEMI ARTICULATED FLEXIBLE DRILLING TOOL1)[J]. MECHANICS IN ENGINEERING, 2018, 40(6): 666-670.
 Citation: LUO Min, DONG Xiaona, XU Tingting, LI Qiaozhen. MODEL ESTABLISHMENT AND LOAD TRANSFER OF SEMI ARTICULATED FLEXIBLE DRILLING TOOL1)[J]. MECHANICS IN ENGINEERING, 2018, 40(6): 666-670.

## MODEL ESTABLISHMENT AND LOAD TRANSFER OF SEMI ARTICULATED FLEXIBLE DRILLING TOOL1)

• 摘要: 半铰接柔性钻具的载荷传递规律直接影响超短半径水平井钻进的成功率。为此，首先推导出半铰接柔性钻杆的单元刚度方程并揭示了半铰接柔性钻杆的弯矩传递规律；然后，采用理论分析与数值模拟相结合的方法，验证了半铰接柔性钻杆有限元模型的正确性；最后，建立造斜段半铰接柔性钻具力学模型，对不同井眼曲率半径下半铰接柔性钻具的载荷传递规律进行研究。结果表明：井深位置相同时，井底扭矩值随曲率半径的增加而增大；半铰接柔性钻杆未锁死时，柔性钻杆不传递弯矩且井底扭矩波动较大，相关研究成果为柔性钻具的设计提供理论依据。

Abstract: The load transfer law of the semi articulated flexible drilling tool directly affects the drilling in ultra short radius horizontal wells. In this paper, firstly, the element stiffness equation is deduced and the bending moment transfer rule of the semi articulated flexible drill is obtained. Then, combining the theoretical analysis and the numerical simulation, the semi articulated flexible drill rod model is verified. Finally, the semi articulated flexible drill mechanical model is established in the build section and the load transfer under different borehole curvature radius conditions is discussed. The analysis results show that with the same well depth, with the increase of the radius of curvature, the bottom hole torque value increases, when the semi articulated flexible drill rod is not locked, the semi articulated flexible drill rod does not transfer the bending moment and increase the large fluctuate torque at the bottom hole . The research results provide a theoretical basis for the design of flexible drilling tools.

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