Method and apparatus for calibrating the output measurement of a

Details Method and apparatus for calibrating the output measurement of a Method and apparatus for calibrating the output measurement of a

1992-07-02

1994-03-08

Wieder, Kenneth A.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324202, G01V 1300

Patent

active

052931285

ABSTRACT:
A calibration fixture for an MWD logging tool consists of a plurality of concentric co-planar conductive calibration loops are mounted around the logging tool mandrel coaxially with the usual transmitter(s) and receivers that are mounted on the tool. The calibration loops are terminated with a multiple-tap impedance quantizing means for discretely varying the impedance of the calibration loops. When a transmitter is activated to emit an electromagnetic signal, the calibration loops are excited to reradiate a portion of that signal into the receivers with an intensity that is a function of the loop impedance thereby to simulate the effects of formations having known resistivities.

REFERENCES:
patent: 4439831 (1984-03-01), Sinclair
patent: 4780678 (1988-10-01), Kleinberg et al.
patent: 4849699 (1989-07-01), Gill et al.
patent: 4876511 (1989-10-01), Clark
patent: 5001675 (1991-03-01), Woodward
The Theory of 2 MHz Resistivity Tool and its Application to Measurement-While-Drilling, Coope et al., The Log Analyst, May-Jun. 1984.
MWD Resistivity Tool Response in a Layered Medium, Zhou et al., Geophysics, v56, n. 11, 1991 (no month).
Calculation of Calibration Loops for Induction Logging Tools, Boganik et al., News from Colleges, (No Month) 1965, No. 9 (with English abstract) Rachet, Ztalonirdbotsngeh Kolyet, Apparatus Induktsionnoge Karotazha.

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