轴向激励作用下钻柱的瞬态动力学建模与分析

摘要

在复杂结构井钻井过程中，由于摩阻转矩、粘滑、托压等影响，导致难以达到预定的靶点。近年来研制了一些辅助振动工具，例如水力振荡器、扭转冲击器等。这些工具的使用起到了提升钻进效率、延长水平段长度的作用。建立了在轴向激励作用下钻柱的瞬态动力学模型，该模型包括1个一维动力学模型和1个三维静态模型。运用该模型可预测复杂三维井眼轨迹和激励作用下钻柱的力学行为。分析了振幅、频率、摩擦因数、传播距离等影响因素，推导出了加入振动激励后钻柱和井壁之间的表观摩擦因数，并计算了振荡类工具的合理安放位置。该模型和计算结果为水力振荡器的设计和现场应用提供了理论依据。%In the process of drilling complex structure wells,because the friction& torque,stick-slip,prop pressure and other effects,making it difficult to achieve the desired targets.In recent years,a number of auxiliary vibrating tools were developed,such as hydraulic oscillators,reversing shock,etc.Using these tools can improve drilling efficiency,prolonging the length of the horizon-tal section.A role in the axial excitation transient dynamics model drillstring was established.The model consists of a one-dimensional dynamic model and a three-dimensional static model.The model is applied to complex three-dimensional trajectory prediction and incentives under the me-chanical behavior of the drill string.The amplitude,frequency,friction coefficient,transmission distance and other factors were analyzed,and deduced after adding vibration excitation between the drill string and the borehole wall apparent friction coefficient.And reasonable oscillation tools placement recommendations are put forward.The model and calculation results provide a theoreti-cal basis for the hydraulic oscillator of this type of tool design and field applications.