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Title: Methods and apparatus for measurement of the resistivity of geological formations from within cased boreholes

Abstract

Methods and apparatus are disclosed which allow measurement of the resistivity of a geological formation through borehole casing which may be surrounded by brine saturated cement. A.C. current is passed from an electrode in electrical contact with the interior of the borehole casing to an electrode on the surface of the earth. The A.C. voltage difference is measured between two additional vertically disposed electrodes on the interior of the casing which provides a measure of the resistivity of the geological formation. A calibration and nulling procedure is presented which minimizes the influence of variations in the thickness of the casing. The procedure also minimizes the influence of inaccurate placements of the additional vertically disposed electrodes.

Inventors:
 [1]
  1. (Bothell, WA)
Publication Date:
Research Org.:
ParaMagnetic Logging, Inc. (Bothell, WA)
OSTI Identifier:
866915
Patent Number(s):
US 4820989
Assignee:
ParaMagnetic Logging, Inc. (Woodinville, WA) RLO
DOE Contract Number:  
FG06-84ER13294
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
methods; apparatus; measurement; resistivity; geological; formations; cased; boreholes; disclosed; allow; formation; borehole; casing; surrounded; brine; saturated; cement; current; passed; electrode; electrical; contact; interior; surface; earth; voltage; difference; measured; additional; vertically; disposed; electrodes; provides; measure; calibration; nulling; procedure; minimizes; influence; variations; thickness; inaccurate; placements; vertically disposed; geological formations; electrical contact; cased boreholes; borehole casing; geological formation; voltage difference; cased borehole; allow measurement; cased bore; /324/

Citation Formats

Vail, III, William B. Methods and apparatus for measurement of the resistivity of geological formations from within cased boreholes. United States: N. p., 1989. Web.
Vail, III, William B. Methods and apparatus for measurement of the resistivity of geological formations from within cased boreholes. United States.
Vail, III, William B. Sun . "Methods and apparatus for measurement of the resistivity of geological formations from within cased boreholes". United States. https://www.osti.gov/servlets/purl/866915.
@article{osti_866915,
title = {Methods and apparatus for measurement of the resistivity of geological formations from within cased boreholes},
author = {Vail, III, William B.},
abstractNote = {Methods and apparatus are disclosed which allow measurement of the resistivity of a geological formation through borehole casing which may be surrounded by brine saturated cement. A.C. current is passed from an electrode in electrical contact with the interior of the borehole casing to an electrode on the surface of the earth. The A.C. voltage difference is measured between two additional vertically disposed electrodes on the interior of the casing which provides a measure of the resistivity of the geological formation. A calibration and nulling procedure is presented which minimizes the influence of variations in the thickness of the casing. The procedure also minimizes the influence of inaccurate placements of the additional vertically disposed electrodes.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Patent:

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