【摘要】 钻铤波的有效抑制对于获取随钻声波测井地层信息至关重要.本研究基于声子晶体理论，设计了一种新型随钻声波测井隔声装置.通过数值模拟计算，对隔声前后的频响曲线、时域波形以及隔声装置的力学性能进行了综合分析.结果表明，这种新型隔声装置能在较宽的低频范围内有效衰减钻铤波，并且不会激发转化斯通利波，这对于基于低频斯通利波开展的渗透率反演等相关研究具有重要意义.与传统的周期性外刻槽结构相比，该隔声装置具有良好的力学性能.此外，本研究还提出了一套融合信号处理技术的残余钻铤波抑制流程，该流程能够显著提高地层纵波信号的相干性，实现地层纵波和横波速度的准确测量.本研究对于增强单极随钻声波测井地层参数反演的有效性具有指导意义.更多还原

【Abstract】 Effective suppression of collar waves is crucial for the accurate acquisition of formation information in logging while drilling(LWD). In this work, we propose a novel acoustic isolator for LWD based on phononic crystal theory. The frequency response curves, time domain waveforms and the mechanical properties of the isolator are comprehensively analyzed through the numerical simulations. It is found that the proposed isolator effectively attenuates collar waves within a broad low frequency range without generating converted Stoneley waves. This feature is particularly significant for permeability inversion and related studies that rely on low frequency Stoneley waves. Compared with traditional periodic externally grooved acoustic isolators, the new isolator exhibits excellent mechanical properties. Additionally, a workflow utilizing signal processing techniques for residual collar waves suppression is introduced. The coherence of formation P-wave signals is enhanced significantly and the velocities of P-wave and S-wave of the formation are measured accurately by applying the workflow proposed. This study provides valuable guidance for improving the effectiveness of formation parameters inversion in monopole acoustic LWD.更多还原