Research and experimental testing of a new kind electrokinetic logging tool

We designed a new downhole electrokinetic logging tool based on numerical simulations and petrophysical experiments. Acoustic and electric receivers cannot be arranged at the same depth, and the proposed composite electrokinetic logging tool offers a solution to this problem. The sound field charact...

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Bibliographic Details
Published in:Applied geophysics 2014-12, Vol.11 (4), p.364-373
Main Authors: Li, Feng-Bo, Ju, Xiao-Dong, Qiao, Wen-Xiao, Lu, Jun-Qiang, Men, Bai-Rong
Format: Article
Language:English
Subjects:
Acoustics
Deflection
Earth and Environmental Science
Earth Sciences
Electrokinetics
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Mathematical models
Measuring instruments
Seismology
Sound pressure
Transducers
Transmission
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Summary:We designed a new downhole electrokinetic logging tool based on numerical simulations and petrophysical experiments. Acoustic and electric receivers cannot be arranged at the same depth, and the proposed composite electrokinetic logging tool offers a solution to this problem. The sound field characteristics of the detectors were tested in a water tank in the laboratory. Then, we calculated the sound pressure of the radiated acoustic field and the transmitting voltage response of the transmitting transducers; in addition, we analyzed the directivity and application of the acoustic transmitting probe based on linear phased array. The results suggest that the sound pressure generated at 1500 mm spacing reaches up to 47.2 kPa and decreases with increasing acoustic source frequency. When the excitation signals delay time of adjacent acoustic transmitting subarrays increases, the radiation beam of the main lobe is deflected and its energy gradually increases, which presumably enhances the acoustoelectric conversion efficiency.
ISSN:1672-7975
1993-0658
DOI:10.1007/s11770-014-0466-9