多极声源在裸眼井外的纵横波辐射特性

发布时间：2018-05-15 07:47

  本文选题：多极子声源 + 井外声场　； 参考：《声学技术》2016年06期

【摘要】：声波远探测方法已逐渐成为石油测井的一门重要应用技术,声源向井外地层中的辐射特性是远探测声场的主控因数。推导了单极、偶极和四极子声源的远场位移渐近解与辐射指向性公式,模拟分析了低频和常规测井频率下多极子声源在井外地层中的辐射图样,优选出不同声源辐射到地层中的优势波类型,并对比了不同频率下优势波指向性的变化规律。结果表明:单极辐射P波和偶极辐射SH横波在各自的辐射声场中占据了主导地位,它们对应的最佳激发频段分别在10 k Hz和4 k Hz左右,而在四极子声源的辐射声场中,P波和SH横波的指向性相近,均优于SV横波,且两者在7 k Hz左右达到最佳,为多极子声波远探测技术的应用提供了理论支持。
[Abstract]:Acoustic remote detection method has gradually become an important application technology of petroleum logging. The radiation characteristics of sound source to the field of well are the main control factor of far detection sound field. The far field displacement asymptotic solutions and radiation directivity formulas of monopole, dipole and quadrupole sound sources are derived, and the radiation patterns of multipole sound sources in the field of wells under low frequency and conventional logging frequency are simulated and analyzed. The dominant wave types radiated by different sound sources into the strata are selected and the variation laws of dominant wave directivity at different frequencies are compared. The results show that the unipolar P wave and the dipole radiation SH wave occupy the dominant position in their respective radiation sound fields, and their corresponding optimal excitation frequency ranges are about 10 kHz and 4 kHz, respectively. In the radiated sound field of quadrupole sound source, the directivity of P wave and SH wave are similar, which are better than SV wave, and they reach the best at about 7 kHz, which provides theoretical support for the application of multipole acoustic wave remote detection technology.
【作者单位】： 中国石油大学(华东)地球科学与技术学院声学测井联合实验室;
【基金】：中央高校基本科研业务费专项资金(15CX06003A)资助
【分类号】：TE14
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本文编号：1891604