随钻扩眼工具的动力学仿真研究

Kinetic simulation study on borehole-inside movement of reaming tool while drilling.

为了解随钻扩眼工具在井眼内的运动状态和受力情况,促进钻井工具的优化设计和更合理的应用,对随钻扩眼工具在井眼内的运动进行了研究,给出了基于拉格朗日方程的动力学分析方法;基于法向接触约束的惩罚准则,计算了扩眼刀翼与岩石之间的接触力,对随钻扩眼工具在井眼内的运动过程和动力响应进行了动力学仿真研究。仿真结果表明,随着随钻扩眼工具轴心偏离井眼轴心距离的增大,或扩眼刀翼数量的减少,所扩井眼的实际可通过半径逐渐减小,扩眼刀翼与井壁的最大接触力则逐渐增大,据仿真结果给出了实际可用的建议。研究结果与相关试验规律吻合较好,说明该分析方法是有效的。研究结果对多翼肋型石油钻井工具的设计和应用具有普遍的指导意义。

For the movement of while-drilling reaming tool in the borehole,the kinetic analytical method based on the Lagrange equation was presented.In terms of the penalty rules of normal-direction contact restriction,the contact force between reamer wings and rock was calculated.Meanwhile,the movement process and dynamic response of reaming tool in the borehole were investigated by kinetic simulation.Results show that with the increase of eccentricity between reaming tool axes and well bore axes,or with the decrease of reamer wing number,the actual pervious radius of reamed borehole will reduce gradually,while the maximal contact force between reamer wing and borehole wall will increase simultaneously.The simulation results present practical and applicable proposition.Research results agree well with relevant experimental law,which explains the availability of proposed analytical method.Research results offer extensive guidance for the design and application of multi-winged oil well drilling devices.