Numerical simulation of acoustic fields in open boreholes generated by linear phased array acoustic transmitters driven by pulse compression signals

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geophysical Prospecting Pub Date : 2024-07-29 DOI:10.1111/1365-2478.13582
Shengyue Tao, Xiaohua Che, Wenxiao Qiao, Jiale Wang, Qiqi Zhao
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Abstract

Acoustic logging is an important method used to determine formation velocities near boreholes. However, in practice, determining accurate formation velocities from acoustic logging data is challenging because of the presence of various noise interferences. Accordingly, a method to increase the amplitudes of refracted waves in open boreholes is proposed herein on the basis of the directional radiation technology of pulse compression signal–driven linear phased array acoustic transmitters. The waveforms generated by a Ricker monopole acoustic transmitter, linear frequency modulation monopole acoustic transmitter and pulse compression signal–driven linear phased array acoustic transmitter in a fluid-filled open borehole are numerically simulated by employing the finite-difference method. The effects of the pulse compression signal–driven linear phased array parameters on the amplitudes of the refracted compressional and shear waves are studied. Results show that borehole mode waves with the same velocities and dispersion characteristics can be determined using the pulse compression signal–driven linear phased array acoustic and Ricker monopole acoustic transmitters in fluid-filled open boreholes. Pulse compression signal–driven linear phased array acoustic transmitters leverage the advantages of pulse compression and phased array technologies, ensuring that a single element can radiate more acoustic energy, whereas pulse compression signal–driven linear phased array parameters can be modulated to further increase the amplitudes of the refracted compressional and shear waves. Compared with Ricker and linear frequency modulation monopole acoustic transmitters, pulse compression signal–driven linear phased array acoustic transmitters can provide downhole received waveforms of better quality and improved a signal-to-noise ratio of the mode wave dispersion curves obtained using the downhole received waveforms. Because pulse compression signal–driven linear phased array acoustic transmitters use linear frequency modulation drive signals of longer duration, the recording time required for the received waveforms is also longer and the amount of data generated is larger, presenting new challenges for downhole data processing and high-speed data transmission.

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对脉冲压缩信号驱动的线性相控阵声发射器在开放式钻孔中产生的声场进行数值模拟
声波测井是用于确定井眼附近地层速度的一种重要方法。然而,在实践中,由于各种噪声干扰的存在,从声波测井数据中确定准确的地层速度具有挑战性。因此,本文以脉冲压缩信号驱动线性相控阵声波发射器的定向辐射技术为基础,提出了一种增加开放井眼中折射波振幅的方法。采用有限差分法对里克单极声发射机、线性频率调制单极声发射机和脉冲压缩信号驱动线性相控阵声发射机在充满液体的开放式钻孔中产生的波形进行了数值模拟。研究了脉冲压缩信号驱动线性相控阵参数对折射压缩波和剪切波振幅的影响。结果表明,使用脉冲压缩信号驱动线性相控阵声学发射器和里克尔单极声学发射器,可以在充满流体的开放式钻孔中测定具有相同速度和频散特性的钻孔模态波。脉冲压缩信号驱动线性相控阵声发射器充分利用了脉冲压缩和相控阵技术的优势,确保单个元件可以辐射更多的声能,而脉冲压缩信号驱动线性相控阵参数可以通过调制来进一步提高折射压缩波和剪切波的振幅。与 Ricker 和线性频率调制单极声发射器相比,脉冲压缩信号驱动线性相控阵声发射器能提供质量更好的井下接收波形,并能提高利用井下接收波形获得的模态波频散曲线的信噪比。由于脉冲压缩信号驱动的线性相控阵声发射机使用的线性频率调制驱动信号持续时间更长,因此接收波形所需的记录时间也更长,产生的数据量也更大,这给井下数据处理和高速数据传输带来了新的挑战。
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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
期刊最新文献
Issue Information Simultaneous inversion of four physical parameters of hydrate reservoir for high accuracy porosity estimation A mollifier approach to seismic data representation Analytic solutions for effective elastic moduli of isotropic solids containing oblate spheroid pores with critical porosity An efficient pseudoelastic pure P-mode wave equation and the implementation of the free surface boundary condition
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