Fossil Fuels

Electromagnetic Well Logging: Models for MWD / LWD by Wilson C. Chin

Posted On February 25, 2017 at 6:46 pm by / Comments Off on Electromagnetic Well Logging: Models for MWD / LWD by Wilson C. Chin

By Wilson C. Chin

"Almost all guides on borehole electromagnetics care for idealizations that aren't applicable bodily, and regrettably, even those versions are corporation proprietary. however, 'exact types' are just to be had via distinct finite point or finite distinction research, and normally, easily describe case stories for designated purposes. In both case, the versions are usually not available

"The publication explains why the thoroughly new version succeeds the place others fail, and demonstrates via quite a few confirmed examples a number of suites of vital 'hands on' applications"-- Read more...

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Mathematically rigorous, computationally quickly, and straightforward to take advantage of, this identify bargains a brand new method of electromagnetic good logging that provides the reservoir engineer a brand new size to MWD/LWD Read more...

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Extra resources for Electromagnetic Well Logging: Models for MWD / LWD Interpretation and Tool Design

Example text

It is generally not possible to simulate both classical induction and modern MWD propagation runs in the same formation with the same computer program. (iii) Dipole approximations, typically used in induction applications, are inappropriate to MWD logging because the presence of high conductivity steel drill collars and their large diameter coils invalidates the simple point-wise description. As noted earlier, dipole modeling is also inappropriate to NMR sensitive magnetic volume characterization.

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. This analytical solution applies to homogeneous, isotropic media only. x Receiver responses show proper axial behavior in a uniform media.

20c. Out-of-phase increments. 9 Example 9. Coil resting along bed interface. 17e,f, we presented a horizontal well example where a “standing” transmitter coil resides across two layers. 21a. 21a. Vertical well problem. 21b. In-phase receiver voltage. 21c. Out-of-phase receiver voltage. 34 Electromagnetic Modeling in Layered Anisotropic Media This “simple” problem is challenging because both current excitation and interfacial matching logic must be implemented along the same z-layer plane. 21b,c display axial receiver voltage responses on each side of the transmitter coil.

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