Axial mode-matching technique for analysis of directional well-logging sensor tools

Pseudo-Analytical Modeling for Electromagnetic Well-Logging Tools in Complex Geophysical Formations

“…For sources with non-zero span along the axial direction (such as tilted-coil antennas that are described in Section 3.5.4), vertical mode expansion described in [6,8,27,46] (where both sources and radial discontinuities are matched over a constant radial plane) appears an appropriate way to model the problem. In [147][148][149] we demonstrate a way to compute the contribution of general and non-zero span sources using the axial mode-matching. To use this method; that is described in detail in Section 3.5.6; we need to consider the existence of general modal excitation coefficients, which may leads toĀ…”

Electromagnetic Characterization of Inhomogeneous Cylindrical Waveguides Using Mode-Matching-Based Methods

“…This method can be used to analyze structures with simple geometry and, many times, closed-form solutions can be derived. Another very popular MMT-based approach used to analyze inhomogeneous guided structures is the numerical mode-matching (NMM) [22,23,63,64,[73][74][75]. In the NMM, the eigenfield solutions are calculated via a numerical FD or FE approach, and they are combined with a closed-form mode-matching boundary enforcement.…”

Study of the Electromagnetic Propagation in Stratified Anisotropic Media via Semi-Analytical Methods

“…This approach has the advantage to allows to petrophysicists to make decisions in real-time, reducing the operational costs, and optimizing the drilling operation. For these reasons, they become one of the most widely used techniques today and several works [2,4,17,24,25,26,27,28,29,30] have studied methods for its improvement.…”

“…26 Normalized amplitude of the electric flux density and magnetic flux density (D z and B z ) in axially-stratified twolayers isotropic medium (First Mode).…”