An Efficient FDTD Method for Axially Symmetric LWD Environments

In this paper, an unconditionally stable finite- difference time-domain (FDTD) method in cylindrical coordinates is developed to analyze electromagnetic responses under axially symmetric measure-while-drilling/logging-while-drilling (MWD/LWD) environments. The method is based on the application of t...

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Veröffentlicht in:	IEEE transactions on geoscience and remote sensing 2008-06, Vol.46 (6), p.1652-1656
Hauptverfasser:	Dagang Wu, Ji Chen, Liu, C.R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Acceleration Algebra Applied geophysics Computational modeling Cylindrical coordinates Drilling Earth sciences Earth, ocean, space Electromagnetic analysis Electromagnetic measurements Exact sciences and technology Finite difference methods Finite difference time domain method Finite-difference time-domain (FDTD) method Internal geophysics Laboratories logging while drilling (LWD) Multigrid methods multigrid technique Remote sensing Simulation Stability Time domain analysis unconditionally stable algorithm Well logging
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Beschreibung
Zusammenfassung:	In this paper, an unconditionally stable finite- difference time-domain (FDTD) method in cylindrical coordinates is developed to analyze electromagnetic responses under axially symmetric measure-while-drilling/logging-while-drilling (MWD/LWD) environments. The method is based on the application of the Crank-Nicholson scheme to the FDTD method in cylindrical coordinates. To accelerate the solution of this approach, an algebraic multigrid method is applied. For several MWD/LWD electromagnetic simulations, it is observed that the proposed method can be close to 20 times faster than the conventional FDTD method.
ISSN:	0196-2892 1558-0644
DOI:	10.1109/TGRS.2008.916202