Page 133 - 《应用声学》2020年第5期

第 39 卷 第 5 期 Vol. 39, No. 5
2020 年 9 月 Journal of Applied Acoustics September, 2020

⋄ 研究报告 ⋄

随钻声波测井隔声体刻槽影响的数值模拟研究 ∗

杨培年 1,2,3 陈德华 1,2,3† 潘 钥 1,2,3 张 咪 1,2,3

(1 中国科学院声学研究所 声场声信息国家重点实验室 北京 100190)
(2 中国科学院大学 北京 100049)
(3 北京市海洋深部钻探研究中心 北京 100190)

摘要：针对随钻声波测井中钻铤波干扰以及刻槽后散射波问题，该文利用时域有限差分法模拟钻铤波在随钻
隔声体中的传播规律，首先考察在无限大流体中钻铤波在凹槽分界面处的散射特征，利用波场快照直观显示
了钻铤波会有一部分能量在刻槽的固液界面转化为斯通利波。同时在有地层时分别对比了均匀内刻槽和外刻
槽对钻铤波的衰减效果，发现在选择均匀内刻槽还是外刻槽时结果不仅与频率范围有关，而且与刻槽的深度
也有关系。最后对比了槽宽较大的均匀凹槽隔声体和槽宽较小的渐变凹槽隔声体。可以得出结论，在设计随
钻隔声体时，在 10 kHz 以下选择均匀外刻槽方式相对于内刻槽隔声效果会更好。随着刻槽槽深增加，外刻槽
在 10 kHz 以下相比于内刻槽隔声性能优势更加明显。渐变刻槽在满足衰减钻铤波幅度要求的同时，散射波对
后续地层波和斯通利波影响也更小。
关键词：随钻声波测井；钻铤波；时域有限差分；渐变凹槽
中图法分类号: TE19 文献标识码: A 文章编号: 1000-310X(2020)05-0775-09
DOI: 10.11684/j.issn.1000-310X.2020.05.017

Numerical simulation study on the influence of groove cutting on acoustic
isolators in acoustic logging while drilling

YANG Peinian 1,2,3 CHEN Dehua 1,2,3 PAN Yue 1,2,3 ZHANG Mi 1,2,3
(1 State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)
(2 University of Chinese Academy of Sciences, Beijing 100049, China)
(3 Beijing Engineering Research Center of Sea Deep Drilling and Exploration, Beijing 100190, China)
Abstract: Aiming at the problem of interference of drill collar waves and scattered wave after grooving
in acoustic logging while drilling, this paper uses the finite-difference time-domain method to simulate the
propagation law of drill collar wave in the acoustic isolator. The scattering properties at the groove interface,
using wave field snapshots, intuitively show that a part of the energy in the drill collar wave is converted into
Stoneley waves at the solid-liquid interface of the groove. At the same time, in the presence of formation, the
attenuation effects of the uniform inner and outer grooves on the drill collar waves were compared. It was
found that when the uniform inner or outer grooves were selected, the results were not only related to the
frequency range, but also the depth of the groove. Finally, a comparison is made between a uniform groove
acoustic isolator with a larger groove width and a graded grooved isolator with a smaller groove width. It can
be concluded that when designing a sound insulation body in acoustic logging while drilling, it is better to
choose a uniform outer groove below 10 kHz rather than an inner groove. With the increase of groove depth,
the external groove under 10 kHz has more obvious acoustic performance advantages than the internal groove.
The graded groove not only satisfies the amplitude of the attenuated drill collar wave, but also has multiple
reflection waves that have less impact on subsequent formation waves and Stoneley waves.
Keywords: Acoustic logging while drilling; Collar waves; Time-domain finite difference; Graded groove

2020-01-14 收稿; 2020-03-31 定稿
国家自然科学基金项目 (11734017)
∗
作者简介: 杨培年 (1992– ), 男, 江西余干人, 博士研究生, 研究方向: 随钻声波测井隔声体。
通信作者 E-mail: chendh@mail.ioa.ac.cn
†