Effects of confining pressure and pore pressure on multipole borehole acoustic field in fluid-saturated porous media

doi:10.1088/1674-1056/acf9e6

中国物理B ›› 2024, Vol. 33 ›› Issue (1): 14301-14301.doi: 10.1088/1674-1056/acf9e6

Effects of confining pressure and pore pressure on multipole borehole acoustic field in fluid-saturated porous media

Zhi-Qiang Zhao(赵志强), Jin-Xia Liu(刘金霞)^†, Jian-Yu Liu(刘建宇), and Zhi-Wen Cui(崔志文)^‡

College of Physics, Jilin University, Changchun 130012, China

收稿日期:2023-08-02 修回日期:2023-09-01 接受日期:2023-09-15 出版日期:2023-12-13 发布日期:2023-12-22
通讯作者: Jin-Xia Liu, Zhi-Wen Cui E-mail:jinxia@jlu.edu.cn;cuizw@jlu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 42074139) and the Natural Science Foundation of Jilin Province, China (Grant No. 20210101140JC).

Effects of confining pressure and pore pressure on multipole borehole acoustic field in fluid-saturated porous media

Zhi-Qiang Zhao(赵志强), Jin-Xia Liu(刘金霞)^†, Jian-Yu Liu(刘建宇), and Zhi-Wen Cui(崔志文)^‡

College of Physics, Jilin University, Changchun 130012, China

Received:2023-08-02 Revised:2023-09-01 Accepted:2023-09-15 Online:2023-12-13 Published:2023-12-22
Contact: Jin-Xia Liu, Zhi-Wen Cui E-mail:jinxia@jlu.edu.cn;cuizw@jlu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 42074139) and the Natural Science Foundation of Jilin Province, China (Grant No. 20210101140JC).

摘要/Abstract

摘要： In-situ stress is a common stress in the exploration and development of oil reservoirs. Therefore, it is of great significance to study the propagation characteristics of borehole acoustic waves in fluid-saturated porous media under stress. Based on the acoustoelastic theory of fluid-saturated porous media, the field equation of fluid-saturated porous media under the conditions of confining pressure and pore pressure and the acoustic field formula of multipole source excitation in open hole are given. The influences of pore pressure and confining pressure on guided waves of multipole borehole acoustic field in fluid-saturated porous media are investigated. The numerical results show that the phase velocity and excitation intensity of guided wave increase significantly under the confining pressure. For a given confining pressure, the phase velocity of the guided wave decreases with pore pressure increasing. The excitation intensity of guided wave increases at low frequency and then decreases at high frequency with pore pressure increasing, except for that of Stoneley wave which decreases in the whole frequency range. These results will help us get an insight into the influences of confining pressure and pore pressure on the acoustic field of multipole source in borehole around fluid-saturated porous media.

关键词: confining pressure, pore pressure, fluid-saturated porous media, multipole borehole acoustic field

Abstract: In-situ stress is a common stress in the exploration and development of oil reservoirs. Therefore, it is of great significance to study the propagation characteristics of borehole acoustic waves in fluid-saturated porous media under stress. Based on the acoustoelastic theory of fluid-saturated porous media, the field equation of fluid-saturated porous media under the conditions of confining pressure and pore pressure and the acoustic field formula of multipole source excitation in open hole are given. The influences of pore pressure and confining pressure on guided waves of multipole borehole acoustic field in fluid-saturated porous media are investigated. The numerical results show that the phase velocity and excitation intensity of guided wave increase significantly under the confining pressure. For a given confining pressure, the phase velocity of the guided wave decreases with pore pressure increasing. The excitation intensity of guided wave increases at low frequency and then decreases at high frequency with pore pressure increasing, except for that of Stoneley wave which decreases in the whole frequency range. These results will help us get an insight into the influences of confining pressure and pore pressure on the acoustic field of multipole source in borehole around fluid-saturated porous media.

Key words: confining pressure, pore pressure, fluid-saturated porous media, multipole borehole acoustic field

中图分类号: (General linear acoustics)

43.20.+g

91.60.Lj (Acoustic properties) 91.30.-f (Seismology) 43.25.+y (Nonlinear acoustics)

Zhi-Qiang Zhao(赵志强), Jin-Xia Liu(刘金霞), Jian-Yu Liu(刘建宇), and Zhi-Wen Cui(崔志文). Effects of confining pressure and pore pressure on multipole borehole acoustic field in fluid-saturated porous media[J]. 中国物理B, 2024, 33(1): 14301-14301.

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Effects of confining pressure and pore pressure on multipole borehole acoustic field in fluid-saturated porous media

Effects of confining pressure and pore pressure on multipole borehole acoustic field in fluid-saturated porous media

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