新型钻井振荡器工作原理与振动特性研究

提出了一种新型钻井振荡器。研究振荡器的工作机理，推导出了轴向脉冲激励函数，在此基础上建立了振荡器轴向振动分析模型，得到振荡器在振动下的位移、速度、加速度等关键参数；根据算例参数设计对应的室内实验，并将算例分析结果与实验结果进行对比，验证了振动分析模型的合理性，结果表明，振荡器可以产生平稳的高频微幅振动，使钻柱与井壁之间的静摩擦转化为动摩擦。研究结果对解决定向井、水平井钻进过程中钻压传递、钻柱磨损、粘卡等问题具有一定的参考意义。

Research on Operation Principles and Vibration Features of New Drilling Oscillator

A new type of drilling oscillator was proposed. According to the working principles of the oscillator, the axial pulse excitation function was deduced. Then, the axial vibration analysis model was established and the vibration characteristics were obtained. The laboratory experiments were designed according to the example parameters, and the results from the example parameters and experiments were compared, which verified the rationality of the vibration analysis model. The results show that: the oscillator can produce steady vibration with high frequency and low amplitude，which can turn static friction into dynamic friction. As a result, the problems of weight on bit transfer, drill string wear and stick slip for directional and horizontal wells may be solved effectively.