Influencing Factors of Shear Wave Radiation of a Dipole Source in a Fluid-Filled Borehole

Hao Wang, Caizhi Wang, Yingming Liu (), Shouji Xia, Haicheng Fu, Ye Yuan, Kang Bie and Xincheng Li
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Hao Wang: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Caizhi Wang: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Yingming Liu: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Shouji Xia: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Haicheng Fu: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Ye Yuan: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Kang Bie: Research Institute of Petroleum Exploration & Development, Tarim Oilfield Company, PetroChina, Korla 841000, China
Xincheng Li: Research Institute of Petroleum Exploration & Development, Tarim Oilfield Company, PetroChina, Korla 841000, China

Energies, 2022, vol. 15, issue 18, 1-12

Abstract: In shear wave far detection logging, dipole-source radiation is the main factor influencing the amplitude of the reflected shear waves. In this paper, a method is derived with the far-field asymptotic solution to calculate the dipole-source radiation of shear waves in a fluid-filled borehole. Then the dipole-source radiation of the shear waves is simulated under both low and high frequencies. In addition, the influences of formation elastic parameters on the dipole-source radiation of the shear waves are analyzed and the variations of the radiation characteristics of the shear wave with source main frequency and borehole radius are compared. Results show that the density and compressional wave velocity of the formation have little effect on the dipole-source radiation of the shear waves. However, the shear wave velocity not only affects the shear wave amplitude radiated to the formation by the dipole source (radiation performance), but also affects the energy distribution of the shear wave at different locations in space (radiation direction). The dipole source has better radiation performance and radiation coverage at low frequency and the optimal excitation frequency in different formations is very close, which is good for the application of this technology under different circumstances. At low frequency, the borehole has little influence on the dipole-source radiation, no matter how large the borehole radius is. However, at high frequency, the borehole modulation of the dipole-source radiation cannot be ignored, especially at large borehole radius.

Keywords: dipole-source radiation; source main frequency; formation elastic parameters; borehole radius (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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