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COMSOL Multiphysics Modeling of Architected Acoustic Transducers in Oil Drilling

Published online by Cambridge University Press:  19 January 2016

Runkun Jiang
Affiliation:
Electrical Engineering Department and Materials Research Institute, N303 Millennium Science Complex, The Pennsylvania State University, University Park, PA 16802, U.S.A.
Lei Mei
Affiliation:
Electrical Engineering Department and Materials Research Institute, N303 Millennium Science Complex, The Pennsylvania State University, University Park, PA 16802, U.S.A.
Q. M. Zhang
Affiliation:
Electrical Engineering Department and Materials Research Institute, N303 Millennium Science Complex, The Pennsylvania State University, University Park, PA 16802, U.S.A.
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Abstract

In the oil and gas industry, acoustic transducers have been found to provide valuable geological sonic information such as compressional wave velocity, shear wave velocity, and rock formation slowness. These data can be used to indicate lithology, determine porosity, detect over-pressured formation zones, and check well to well correlation. One category of such acoustic transducers is equipped with piezoelectric elements. Conventional piezoelectric transducers are packaged by epoxy resin. Because of the liquid nature of uncured epoxy resin, it is difficult to position the piezoelectric elements accurately. The introduction of polyether ether ketone (PEEK) as the packaging material solved this issue. Due to the ease of machining on solid form, architectures of the composite acoustic transducers can be devised with great flexibility and creativity. These designs can be modeled with finite element methods (FEM) and the best design for the oil drilling application can be finalized and fabricated.

COMSOL Multiphysics® solves problems in a programming environment that integrates relevant physics. In this case, it includes electrical circuit, solid mechanics, acoustics, and piezoelectricity. Here a compete model and procedure to study the performance of an architected composite acoustic transducer is provided. The displacement analysis gives insights into the resonance modes of the piezoelectric elements. The acoustics analysis gives the necessary information on the acoustic performance of the transducers, such as acoustic pressure spatial distribution, acoustic pressure frequency response, transmitting voltage response, and directivity. These are important criteria to judge the effectiveness of an architected transducer.

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Copyright
Copyright © Materials Research Society 2016 

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References

Ellis, Darwin V., and Singer, Julian M., Well Logging for Earth Scientists, Springer: Dordrecht, The Netherlands (2008)Google Scholar
Alford, Jeff, et al. , Sonic Logging While Drilling - Shear Answers, Oilfield Review, Spring, 415 (2012)
Brie, Alain, et al. , New Directions in Sonic Logging, Oilfield Review, Spring, 4055 (1998)
Arroyo Franco, J. L., et al. , Sonic Investigation In and Around the Borehole, Oilfield Review, Spring, 1433 (2006)
Scheibner, David, et al. , Slow Formation Shear from An LWD Tool: Quadrupole Inversion with A Gulf of Mexico Example, SPWLA 51st Annual Logging Symposium, June 19-23, 1-14 (2010)
Jiang, Runkun, et al. , High-Power Broadband Piezocomposite Transducers for Logging-While-Drilling Applications, International Workshop on Acoustic Transduction Materials and Devices, May 2015
Jiang, Runkun, et al. , Understanding Logging-While-Drilling Transducers with COMSOL Multiphysics Software, COMSOL Conference Boston, October 2015

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