指向式导向工具主轴偏置力与造斜性能研究1)

STUDY ON SPINDLE OFFSET FORCE AND DEFLECTION PERFORMANCE OF POINT-BIT STEERABLE TOOL1)

  • 摘要: 为研究钻压传递机构安装位置对指向式导向工具主轴偏置力与造斜性能的影响规律,基于横向弯曲梁和纵横弯曲梁力学模型建立了考虑轴向载荷的主轴力学模型,运用微分方程通解对管柱力学进行求解的管柱单元组合方法,推导出主轴的几何方程和力学方程,分析了钻压传递机构安装位置对导向工具偏置力、钻头侧向力与钻头倾角等造斜性能参数的影响。结果表明,钻压传递机构安装位置距离钻头越远,工具主轴造斜所需的偏置力越小,而钻头侧向力与钻头倾角越大。

     

    Abstract: In order to study the influence of the installation position of weight on bit (WOB) transfer device on the spindle offset force and deflection performance of point-bit steerable tool, a mechanical model of spindle considering axial load is developed based on the mechanical model of transverse bending beam and the bending beam with combined axial and lateral load. The beam element assembly method is used to solve the string mechanics by using the general solution of differential equation. The geometric equation and mechanical equation of spindle are derived. And the effects of the position of WOB transfer device on the spindle offset fore and deflection performance parameters such as bit side force and bit inclination are investigated. The results show that when increasing the position of the WOB transfer device from the bit, the offset force required for tool spindle deflect will be reduced, and the bit-side force and bit inclination will be increased.

     

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