Time domain electromagnetic well logging sensor including arcuat

Details Time domain electromagnetic well logging sensor including arcuat Time domain electromagnetic well logging sensor including arcuat

1995-09-25

1997-05-20

O'Shea, Sandra L.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324642, G01V 312, G01R 2702

Patent

active

056315627

ABSTRACT:
An electromagnetic well logging tool for imaging the electrical characteristics of a borehole. A tool inserted into the borehole includes the appropriate mechanical apparatus to align a plurality of transmission lines adjacent to the borehole wall without requiring direct electrical contact. Electrical circuitry applies a step or impulse voltage on one end and samples the reflections at the same end of each transmission line, where the reflections indicate the magnitude of any changes of dielectric constant of the material of the borehole wall. The transmission lines are preferably angled relative to the center line of the borehole for a complete mapping of the circumference. The tool is moved at a desired speed through the portion of the borehole where measurement is desired. The sampling rate of the reflections depends on the desired speed of the tool and the desired resolution of the measurements.

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