Factors Influencing Radiation Sound Fields in Logging While Drilling Using an Acoustic Dipole Source

With the increasing number of complex well types in the development stage of oil and gas fields, it is becoming increasingly urgent to use remote detection logging while drilling (LWD) to explore the geological structures in a formation. In this paper, the feasibility and reliability of the dipole r...

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Bibliographic Details
Published in:Processes 2024-10, Vol.12 (10), p.2118
Main Authors: Cao, Jingji, Qin, Ruibao, Li, Xiongyan, Ye, Xinyu, Hei, Chuang, Yin, Zhongxu, Wang, Peng
Format: Article
Language:English
Subjects:
Acoustics
Asymptotic methods
Boundary conditions
Collars
Dipoles
Drilling
Drilling and boring
Drilling muds
Elastic waves
Energy
Far fields
Horizontal polarization
Interfaces
Oil fields
P waves
Parameters
Pattern analysis
Petroleum mining
Radiation
Shear
Signal reflection
Sound fields
Structural reliability
Vertical polarization
Wave reflection
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Summary:With the increasing number of complex well types in the development stage of oil and gas fields, it is becoming increasingly urgent to use remote detection logging while drilling (LWD) to explore the geological structures in a formation. In this paper, the feasibility and reliability of the dipole remote detection of logging while drilling are demonstrated theoretically. For this purpose, we use an asymptotic solution of elastic wave far-field displacement to derive the calculation formula for the radiation pattern and energy flux of an LWD dipole source. The effects of influencing factors, including the source frequency, formation property, drill collar size, and mud parameter, on the radiation pattern and energy flux are analyzed. The results show that the horizontally polarized shear wave (SH-wave) has a greater advantage in imaging the reflector compared with the cases of the compressive wave (P-wave) and vertically polarized shear wave (SV-wave), which indicates the dominance of the SH-wave in dipole remote detection while drilling. The optimal source excitation frequency of 2.5 kHz and inner and outer radii of the drill collar of 0.02 and 0.1 m, respectively, should be considered in the design of an LWD dipole shear wave reflection tool. However, the heavy drilling mud is not conducive to remote detection during logging while drilling. In addition, the reflection of the SH-wave for the LWD condition is simulated. Under the conditions of optimal source frequency, drill collar size, and mud parameters, the reflection of the SH-wave signal is still detected under the fast formation.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr12102118