During the drilling process, the pressure measurement device of logging while drilling is affected by the severe vibration and impact load of the drill string, which is likely to cause fatigue damage to the weak parts. To study the anti-vibration performance of the small logging while drilling instrument, a finite element model of the drill string was established in this paper combined with finite element technology. Moreover, this paper analyzes the vibration frequency of the drill string and gives the method of using different drilling tools and drilling speeds at different depths to reduce the damage to the measuring device caused by the resonance of the drill string. Then, this paper analyzes the impact load to obtain the acceleration and displacement changes of the measuring device. In addition, this paper analyzes the anti-vibration performance of the instrument in the assembly of the outer steel pipe, including modal analysis, harmonic response analysis and random vibration analysis, and finds the weak link of the structure. Through experimental research, it can be known that the finite element method proposed in this paper has a certain effect in the analysis of the anti-vibration performance of the small instrument of Logging While Drilling.

在钻井过程中，随钻测压装置受到钻柱剧烈振动和冲击载荷的影响，容易对薄弱部位造成疲劳损伤。为研究小型随钻测井仪的抗振性能，结合有限元技术建立了钻柱有限元模型。此外，本文还分析了钻柱的振动频率，给出了在不同深度使用不同钻具和钻孔速度的方法，以减少钻柱共振对测量装置的损坏。然后，本文分析了冲击载荷，以获得测量装置的加速度和位移变化。此外，本文分析了仪器在外钢管装配中的抗振性能，包括模态分析、谐响应分析和随机振动分析，找出结构的薄弱环节。通过实验研究可知，本文提出的有限元方法对随钻测井小型仪器的抗振性能分析具有一定的效果。