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Title: Methods and apparatus for measurement of the resistivity of geological formations from within cased wells in presence of acoustic and magnetic energy sources

Abstract

Methods and apparatus are provided for measuring the acoustically modulated electronic properties of geological formations and cement layers adjacent to cased boreholes. 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. Voltage measuring electrodes in electrical contact with the interior of the casing measure the voltage at various points thereon. The voltage differences between discrete pairs of the voltage measuring electrodes provide a measurement of the leakage current conducted into formation in the vicinity of those electrodes. Simultaneously subjecting the casing and formation to an acoustic source acoustically modulates the leakage current measured thereby providing a measure of the acoustically modulated electronic properties of the adjacent formation. Similarly, methods and apparatus are also described which measure the leakage current into formation while simultaneously subjecting the casing to an applied magnetic field which therefore allows measurement of the magnetically modulated electronic properties of the casing and the adjacent formation.

Inventors:
 [1]
  1. (Bothell, WA)
Issue Date:
Research Org.:
ParaMagnetic Logging, Inc. (Bothell, WA)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
867956
Patent Number(s):
5043669
Assignee:
Para Magnetic Logging, Inc. (Woodinville, WA) RLO
DOE Contract Number:  
FG06-84ER13294; FG22-88BC14243
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
methods; apparatus; measurement; resistivity; geological; formations; cased; presence; acoustic; magnetic; energy; sources; provided; measuring; acoustically; modulated; electronic; properties; cement; layers; adjacent; boreholes; current; passed; electrode; electrical; contact; interior; borehole; casing; surface; earth; voltage; electrodes; measure; various; thereon; differences; discrete; pairs; provide; leakage; conducted; formation; vicinity; simultaneously; subjecting; source; modulates; measured; providing; similarly; described; applied; field; allows; magnetically; acoustic source; measuring electrodes; energy sources; geological formations; electrical contact; magnetic field; energy source; voltage measuring; cased boreholes; electronic properties; applied magnetic; borehole casing; geological formation; leakage current; magnetic energy; voltage difference; modulated electron; cased borehole; casing measure; cement layers; modulated electronic; voltage differences; electrodes provide; allows measurement; current conducted; measuring electrode; layers adjacent; discrete pairs; cased bore; simultaneously subject; /324/

Citation Formats

Vail, III, William B. Methods and apparatus for measurement of the resistivity of geological formations from within cased wells in presence of acoustic and magnetic energy sources. United States: N. p., 1991. Web.
Vail, III, William B. Methods and apparatus for measurement of the resistivity of geological formations from within cased wells in presence of acoustic and magnetic energy sources. United States.
Vail, III, William B. Tue . "Methods and apparatus for measurement of the resistivity of geological formations from within cased wells in presence of acoustic and magnetic energy sources". United States. https://www.osti.gov/servlets/purl/867956.
@article{osti_867956,
title = {Methods and apparatus for measurement of the resistivity of geological formations from within cased wells in presence of acoustic and magnetic energy sources},
author = {Vail, III, William B.},
abstractNote = {Methods and apparatus are provided for measuring the acoustically modulated electronic properties of geological formations and cement layers adjacent to cased boreholes. 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. Voltage measuring electrodes in electrical contact with the interior of the casing measure the voltage at various points thereon. The voltage differences between discrete pairs of the voltage measuring electrodes provide a measurement of the leakage current conducted into formation in the vicinity of those electrodes. Simultaneously subjecting the casing and formation to an acoustic source acoustically modulates the leakage current measured thereby providing a measure of the acoustically modulated electronic properties of the adjacent formation. Similarly, methods and apparatus are also described which measure the leakage current into formation while simultaneously subjecting the casing to an applied magnetic field which therefore allows measurement of the magnetically modulated electronic properties of the casing and the adjacent formation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

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