Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources
Mathematics and Computer Science
Volume 1, Issue 3, September 2016, Pages: 48-55
Received: Sep. 6, 2016; Accepted: Sep. 19, 2016; Published: Sep. 29, 2016
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Kuo Zhang, Beijing CCID Publishing & Media Co., Ltd., Beijing, China;State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China
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In this paper, we extend the Real Axis Integration (RAI) method and improve the Finite Difference Time Domain (FDTD) method to investigate the wave fields excited by the monopole and multipole Acoustic Logging While Drilling (ALWD) sources with low and high center frequencies. We simulate the two traditional kinds of source exerting methods by both of the RAI and FDTD methods accurately and efficiently. Mutual verification of the two methods ensures the validity and reliability of our theoretic analysis and modeling results. The modeling results indicate that the ring source can only excite those monopole or multipole wave modes of certain orders. The four azimuthally orthogonal point sources can excite similar wave modes only at the lower frequencies, but at higher frequencies, they might further excite wave modes of higher orders with significant amplitude. These modeling results may help the design of ALWD tools, and also provide an essential basis for the further analysis of the ALWD problems in anisotropic formations and tool eccentric conditions.
Logging While Drilling, Real Axis Integration, Finite Difference Time Domain, Staggered Grid Scheme, Perfectly Matched Layer, Ring Source, Azimuthally Orthogonal Point Sources, Multipole Wave Mode
To cite this article
Kuo Zhang, Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources, Mathematics and Computer Science. Vol. 1, No. 3, 2016, pp. 48-55. doi: 10.11648/j.mcs.20160103.13
Copyright © 2016 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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