Page 94 - 《应用声学》2023年第4期

第 42 卷 第 4 期 Vol. 42, No. 4
2023 年 7 月 Journal of Applied Acoustics July, 2023

⋄ 研究报告 ⋄

随钻声波测井四极子发射换能器的设计 ∗

孙志峰 † 仇 傲 刘西恩 李 杰 罗 博

(中海油田服务股份有限公司 北京 101149)

摘要：随钻四极子发射换能器作为随钻声波仪器的核心部件，其工作性能直接影响随钻地层横波的测量效果。
提出一种基于金属基片结构的随钻四极子发射换能器，其一阶弯曲模式可用于随钻四极子声源。利用有限元
法对该换能器进行了设计分析，结果表明在 5 kHz 附近存在一阶弯曲振动模态，其径向位移值分布及发射电压
响应均优于现用的瓦片状四极子换能器，非常适合随钻四极子工作频率及声场的测量需求。针对一阶弯曲振
动模态，数值模拟了几何尺寸对金属基片结构的四极子换能器性能参数的影响。换能器谐振频率随着陶瓷片
厚度、陶瓷片高度、陶瓷片张开角度、金属基片厚度的增大而升高。最大发射电压响应随陶瓷片高度、陶瓷片张
开角、金属片厚度的增大而升高；随着陶瓷片厚度的增大先升高后逐渐降低。金属基片采用铝片可以使换能器
有较大的发射功率。数值模拟结果可以对随钻声波测井仪四极子发射换能器的设计提供参考。
关键词：金属基片；压电陶瓷片；四极子换能器；有限元；随钻声波
中图法分类号: P631.52 文献标识码: A 文章编号: 1000-310X(2023)04-0756-08
DOI: 10.11684/j.issn.1000-310X.2023.04.011

The design of quadrupole transmitting transducer used in LWD acoustic logging

SUN Zhifeng QIU Ao LIU Xi’en LI Jie LUO Bo

(China Oilfield Services Limited, Beijing 101149, China)

Abstract: As the core component of logging while drilling (LWD) acoustic logging tool, performance of
quadrupole transducer directly affects measurement accuracy of formation shear wave. This paper proposes a
kind of LWD quadrupole transmitting transducer based on metal substrate structure, and its first longitudinal
bending vibration mode can be used for the LWD quadrupole acoustic source. The finite element method is used
to design and analyze the transducer. The results show that the resonance frequency of the first longitudinal
bending vibration mode is about 5 kHz, and its radial displacement distribution and transmitting voltage
response are better than existing arc-shaped piezoelectric vibrator. This transducer’s resonance frequency
and acoustic field characteristic are suitable for the measurement requirements of LWD quadrupole acoustic
logging. Aimed at this first mode, the influence of geometrical size on the performance parameters of the
transducer is simulated numerically. The resonance frequency will rise as thickness, height, opening angle of
ceramic plate, or thickness of metal substrate increases. The maximum transmitting voltage response will rise
as height, opening angle of ceramic plate or thickness of metal substrate increases, and increase first and then
decrease gradually with thickness of ceramic plate increases. Aluminum metal substrate can make transducer
have higher transmitting power. The numerical simulation results play a good guiding role on design of the
quadrupole transmitting transducer.
Keywords: Metal substrate; Piezoelectric vibrator; Quadrupole transducer; Finite element method; LWD
acoustic logging

2022-02-10 收稿; 2023-01-17 定稿
国家自然科学基金项目 (U21B2064), 中国海洋石油集团有限公司项目 (YJB18YF010)
∗
作者简介: 孙志峰 (1979– ), 男, 河北沧州人, 博士, 高级工程师, 研究方向: 声波测井的数值模拟及数据处理方法。
通信作者 E-mail: sunzhf3@cnooc.com.cn
†