Research and experimental testing of a new kind electrokinetic logging tool

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• 作者：Feng-Bo Li (1) (2)
  Xiao-Dong Ju (1) (2)
  Wen-Xiao Qiao (1) (2)
  Jun-Qiang Lu (1) (2)
  Bai-Rong Men (1) (2)
  
  1. State Key Laboratory of Petroleum Resources and Prospecting ; China University of Petroleum ; Beijing ; 102249 ; China
  2. Key Laboratory of Earth Prospecting and Information Technology ; Beijing ; 102249 ; China
  
• 关键词：electrokinetic logging ; seismoelectric well logging ; seismoelectric effect ; electrokinetic effect ; acoustoelectric effect ; sound field
• 刊名：Applied Geophysics
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：11
• 期：4
• 页码：364-373
• 全文大小：893 KB
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• 刊物主题：Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-0658

文摘

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.