Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources

Kuo Zhang

doi:doi:10.11648/j.mcs.20160103.13

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Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources

Kuo Zhang

Published in Mathematics and Computer Science (Volume 1, Issue 3)

Received: 6 September 2016 Accepted: 19 September 2016 Published: 29 September 2016

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Abstract

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.

Published in	Mathematics and Computer Science (Volume 1, Issue 3)
DOI	10.11648/j.mcs.20160103.13
Page(s)	48-55
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2016. Published by Science Publishing Group

Keywords

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

References

[1]	Wang T, Signorelli J. Finite-difference modeling of electromagnetic tool response for logging while drilling. Geophysics, 2004, 69 (1): 152-160.
[2]	Tang X M, Dubinsky V, Wang T, et al. Shear-Velocity Measurement in the Logging-While-Drilling Environment: Modeling and Field Evaluations. Petrophysics, 2003, 44 (2): 79-90.
[3]	Huang X J, Zheng Y B, Toksöz M N. Effects of tool eccentricity on acoustic logging while drilling (LWD) measurements. SEG Technical Program Expanded Abstracts, 2004: 290-293.
[4]	Wang B, Tao G, Chen T R. Experimental study of acoustic logging while drilling measurements using an asymmetric source. Chinese Journal of Geophysics, 2012, 55 (1): 327-332.
[5]	Wang H, Tao G, Zhang K. Wavefield simulation and analysis with the finite-element method for acoustic logging while drilling in horizontal and deviated wells. Geophysics, 2013, 78 (6): D525-D543.
[6]	Wang T L, Tang X M. Finite-difference modeling of elastic wave propagation: A non-splitting perfectly matched layer approach. Geophysics, 2003, 68 (5): 1749-1755.
[7]	Wang H, Tao G, Wang B, et al. Wave field simulation and data acquisition scheme analysis for LWD acoustic tool. Chinese Journal of Geophysics, 2009, 52 (9): 2402-2409.
[8]	Yan X H. Numerical simulation investigation on acoustic transmission characteristics in Logging While Drilling. PhD Dissertation, China University of Petroleum, 2010.
[9]	Byun J M. Toksöz M N. Analysis of the acoustic wavefields excited by the Logging-While-Drilling (LWD) tool. Geosystem Engineering, 2003, 6 (1): 19-25.
[10]	Tang X M, Cheng A. Quantitative borehole acoustic methods. Elsevier, Volume 24 of Handbook of Geophysical Exploration, Seismic Exploration, 2004.
[11]	Zhang K, Tao G, Li J X, et al. On RAI and FDFE Simulations of Acoustic Well Logging Scheme. 75th EAGE Conference & Exhibition incorporating SPE EUROPEC, 2013.
[12]	Byun J, Toksöz M N. Effects of an off-centered tool on dipole and quadrupole logging. Geophysics, 2006, 71 (4): F91-F100.

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APA Style

Kuo Zhang. (2016). Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources. Mathematics and Computer Science, 1(3), 48-55. https://doi.org/10.11648/j.mcs.20160103.13

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ACS Style

Kuo Zhang. Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources. Math. Comput. Sci. 2016, 1(3), 48-55. doi: 10.11648/j.mcs.20160103.13

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AMA Style

Kuo Zhang. Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources. Math Comput Sci. 2016;1(3):48-55. doi: 10.11648/j.mcs.20160103.13

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@article{10.11648/j.mcs.20160103.13,
  author = {Kuo Zhang},
  title = {Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources},
  journal = {Mathematics and Computer Science},
  volume = {1},
  number = {3},
  pages = {48-55},
  doi = {10.11648/j.mcs.20160103.13},
  url = {https://doi.org/10.11648/j.mcs.20160103.13},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.mcs.20160103.13},
  abstract = {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.},
 year = {2016}
}

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TY  - JOUR
T1  - Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources
AU  - Kuo Zhang
Y1  - 2016/09/29
PY  - 2016
N1  - https://doi.org/10.11648/j.mcs.20160103.13
DO  - 10.11648/j.mcs.20160103.13
T2  - Mathematics and Computer Science
JF  - Mathematics and Computer Science
JO  - Mathematics and Computer Science
SP  - 48
EP  - 55
PB  - Science Publishing Group
SN  - 2575-6028
UR  - https://doi.org/10.11648/j.mcs.20160103.13
AB  - 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.
VL  - 1
IS  - 3
ER  -

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Author Information

Kuo Zhang

Beijing CCID Publishing & Media Co., Ltd., Beijing, China

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Plain Text BibTeX RIS

APA Style

Kuo Zhang. (2016). Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources. Mathematics and Computer Science, 1(3), 48-55. https://doi.org/10.11648/j.mcs.20160103.13

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ACS Style

Kuo Zhang. Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources. Math. Comput. Sci. 2016, 1(3), 48-55. doi: 10.11648/j.mcs.20160103.13

Copy | Download

AMA Style

Kuo Zhang. Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources. Math Comput Sci. 2016;1(3):48-55. doi: 10.11648/j.mcs.20160103.13

Copy | Download

@article{10.11648/j.mcs.20160103.13,
  author = {Kuo Zhang},
  title = {Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources},
  journal = {Mathematics and Computer Science},
  volume = {1},
  number = {3},
  pages = {48-55},
  doi = {10.11648/j.mcs.20160103.13},
  url = {https://doi.org/10.11648/j.mcs.20160103.13},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.mcs.20160103.13},
  abstract = {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.},
 year = {2016}
}

Copy | Download

TY  - JOUR
T1  - Discussion on Borehole Wave Modes Excited by Two Types of Acoustic Logging While Drilling Sources
AU  - Kuo Zhang
Y1  - 2016/09/29
PY  - 2016
N1  - https://doi.org/10.11648/j.mcs.20160103.13
DO  - 10.11648/j.mcs.20160103.13
T2  - Mathematics and Computer Science
JF  - Mathematics and Computer Science
JO  - Mathematics and Computer Science
SP  - 48
EP  - 55
PB  - Science Publishing Group
SN  - 2575-6028
UR  - https://doi.org/10.11648/j.mcs.20160103.13
AB  - 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.
VL  - 1
IS  - 3
ER  -

Copy | Download