Abstract
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.
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This work was supported by the National Science Foundation of China (No. 61102102, 11134011, 11204380 and 11374371), Major National Science and Technology Projects (No. 2011ZX05020-009), Science and Technology Project of CNPC (No. 2014A-3912 and 2011B-4001), and PetroChina Innovation Foundation (No. 2014D-5006-0307).
Li Feng-Bo, he is currently a Ph.D. student at the China University of Petroleum (Beijing). His main research interests are in geophysical well logging methods, logging tool and equipment.
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Li, FB., Ju, XD., Qiao, WX. et al. Research and experimental testing of a new kind electrokinetic logging tool. Appl. Geophys. 11, 364–373 (2014). https://doi.org/10.1007/s11770-014-0466-9
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DOI: https://doi.org/10.1007/s11770-014-0466-9