By Wilson C. Chin
"Almost all courses on borehole electromagnetics care for idealizations that aren't appropriate bodily, and regrettably, even those types are corporation proprietary. nonetheless, 'exact types' are just on hand via specified finite point or finite distinction research, and ordinarily, easily describe case reports for precise functions. In both case, the types usually are not available for common use and the price of the courses is questionable. This new method presents a rigorous, totally third-dimensional technique to the final challenge, constructed over nearly twenty years through a researcher acquainted with functional functions and mathematical modeling. thoroughly proven opposed to particular ideas and physics-based assessments via over 100 documented examples, the self-contained version (with distinct integrated matrix solvers and new release algorithms) with a 'plain English graphical person interface' has been optimized to run tremendous fast--seconds in step with run rather than mins and hours--and then instantly offers all electrical and magnetic box effects via built-in third-dimensional colour images. as well as cutting-edge algorithms, uncomplicated 'utility courses' also are constructed, reminiscent of basic dipole tools, Biot-Savart huge diameter types, nonlinear section and amplitude interpolation algorithms, etc. exceptionally invaluable to oilfield practitioners, this quantity is a must have for critical execs within the box, and all of the algorithms have passed through a arduous validation strategy with actual use within the field"--
"The e-book explains why the thoroughly new version succeeds the place others fail, and demonstrates via various tested examples a number of suites of vital 'hands on' applications"-- �Read more...
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Extra resources for Electromagnetic Well Logging: Models for MWD / LWD Interpretation and Tool Design
37 38 Electromagnetic Modeling in Layered Anisotropic Media Importantly, our nondipolar transmitter coil is represented by a symmetric array of eight azimuthally equidistant nodal points, where current vector density magnitudes are prescribed. These magnitudes are real for constant frequency applications, and take on complex values, when the general model is used to study harmonic Fourier components of highly transient fields. Because our coil diameters can reside across multiple bed layers, we are assured of correct charge and polarization modeling in thinly laminated zones.
X Higher attenuation anticipated with increases in frequency and conductivity is always achieved. x Drill collar modeling is always invokes “six gridblocks across” zeroing of internal fields. Setting E = 0 at collar nodes is justified since the collar is grounded in mud and no attempt is made to simulate at skin depth scales. x Numerical phase and amplitude agreement with special exact Bessel function solutions for realistic coil-alone versus steel-mandrel tools derived by Shen (1991) is crucial.
The second, strongly dependent on conductivity, shows the “bias” resulting from the assumed resistivity contrast; for example, one side displays the large voltage drops associated with high conductivity. 6 Closing Remarks Although we have focused on the powerful simulation capabilities of the new model, our ultimate objectives are really directed more at modern logging than they are at numerical analysis, and particularly, electromagnetic behavior. Electromagnetics provides the common bond linking resistivity logging to NMR, and ultimately, to fluid imaging.