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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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2008-06, Vol.46 (6), p.1652-1656
Main Authors: Dagang Wu, Ji Chen, Liu, C.R.
Format: Article
Language:English
Subjects:
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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Summary: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