The structure of the hydraulic drifter is introduced, and the process of drilling into rocks by the drifter is established as a physical model of rock with three-degree-of-freedom dry friction. Four modes of the physical model are introduced. The solutions of the physical model are divided into three segments. The angular frequency and amplitude of the hydraulic force are taken as control parameters to obtain stable periodic trajectories and the point of maximum ROP. Bifurcations such as period-doubling, saddle–node, and torus are discovered. The data acquisition system for drilling rocks with a hydraulic drifter is introduced, and the displacement and velocity of the piston obtained from the model and experiments are compared. The results indicate that to make the drifter work on the non-stick penetration mode of period-1, the range of angular frequency should be 2.66<ω<5.28, and the range of amplitude should be 0.13<a<3. There is a strong correlation between the experiments and the model, and compared to the experiment, the piston in the model undergoes deceleration before colliding with the drill string, adding an impact deceleration stroke.

中文翻译：

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通过干摩擦岩石模型对水力漂流器进行试验和连续分析


介绍了液压漂流器的结构，并将漂流器钻入岩石的过程建立为具有三自由度干摩擦的岩石物理模型。介绍了物理模型的四种模式。物理模型的解分为三个部分。以液压力的角频率和幅值作为控制参数，以获得稳定的周期性轨迹和最大 ROP 点。发现了分叉，例如周期加倍、鞍状节点和环面。介绍了使用液压漂流器钻探岩石的数据采集系统，并比较了从模型和实验中获得的活塞的位移和速度。结果表明，要使漂移器工作在周期-1的不粘刺模式下，角频率范围应为2.66<ω<5.28，振幅范围应为0.13<a<3。实验与模型之间存在很强的相关性，与实验相比，模型中的活塞在与钻柱碰撞之前经历了减速，增加了冲击减速行程。