面向随钻检测的钻柱纵向振动特性分析

Design Analysis of Longitudinal Vibration Characteristics of Drill String for Laser Raman Drilling Detection

摘要: 激光拉曼检测装置在钻杆中不可避免地会受到钻柱纵向振动的影响，因此本文对钻柱系统进行纵向振动特性分析。建立了钻柱有限元模型，用ANSYS对钻柱的纵向振动进行了模态分析、谐响应分析和瞬态动力学分析，分析结果表明：钻柱纵向固有频率随钻柱长度的增加而减小；当钻压增大或钻柱长度增加时，钻柱纵向振动振幅都会增大；有必要通过减振装置来减少钻柱纵向振动对激光拉曼检测装置的影响。

Abstract: In laser Raman detection systems deployed within drill pipes, the longitudinal vibration of the drill string inevitably affects the stability and accuracy of measurements. To address this issue, this study investigates the longitudinal vibration characteristics of the drill string system. A finite element model of the drill string was established, and modal analysis, harmonic response analysis, and transient dynamic analysis were carried out using ANSYS. The results indicate that the natural longitudinal frequency of the drill string decreases with increasing drill string length. Furthermore, both increased bit pressure and longer drill string length lead to higher longitudinal vibration amplitudes. These findings suggest that it is necessary to implement vibration damping devices to mitigate the adverse effects of longitudinal vibrations on the laser Raman detection system.