深层油气开发钻遇复杂结构井型增多，使用传统滑动钻具时靶向钻进困难。为助力解决复杂结构井型井眼轨迹控制难题，提出一种非连续型指向式旋转导向结构，在此基础上，结合有限元法单元划分思想和纵横弯曲法，建立一种非连续性指向式旋转导向底部钻具组合（rotary steerable bottom hole assembly, RSBHA）力学模型，通过编译力学程序，求解出底部钻具组合钻头侧向力和倾角，并分析井身几何参数、钻井参数和钻具组合结构参数对力学性能的影响规律。得出钻压与井斜对钻头侧向力影响较小，钻具组合结构参数影响较大。研究成果为旋转导向底部钻具组合结构优化及钻井参数优化提供理论前提，为井眼轨迹精确控制提供力学支撑。

In deep oil and gas development, it is difficult to drill targeted with traditional sliding drilling tools because of the increasing number of wells with complex structure. To help solve the problem of wellbore trajectory control in complex structural wells, a discontinuous directional rotary steerable structure was proposed. Moreover, a mechanical model of discontinuous directional rotary steerable bottom hole assembly(RSBHA) was established by combining the element division idea of finite element method and the continuous beam-column theory. The bit side force and dip angle of were calculated by compiling mechanics program. The effects of borehole geometry parameters, drilling parameters and drill assembly structure parameters on mechanical properties were analyzed. It is concluded that weight on bit and inclination of hole have little influence on bit side force, but the structural parameters of drill assembly have great influence. The research results provide theoretical premise for the optimization of RSBHA structure and drilling parameters, and provide mechanical support for accurate control of wellbore trajectory.