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AssigneeWestern Atlas International, Inc.
InventorsMilton E. Cram, Thomas A. Janes
Estimating the term…
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.
A time domain reflectometer logging tool for measuring the electrical characteristics of the materials along the wall of a borehole having a center axis, comprising:
A method of using a time domain reflectometer to measure the electrical properties of the materials in a borehole having a center axis, comprising the steps of:
Dependencies are inferred from the claim text.