DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

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. 9 figures.

Inventors:
Issue Date:
OSTI Identifier:
7083345
Patent Number(s):
5043669
Application Number:
CNN: 5088-212-1664; PPN: US 7-438268
Assignee:
Para Magnetic Logging, Inc., Woodinville, WA (United States)
DOE Contract Number:  
FG06-84ER13294; FG22-88BC14243
Resource Type:
Patent
Resource Relation:
Patent File Date: 16 Nov 1989
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 58 GEOSCIENCES; RESISTIVITY LOGGING; WELL LOGGING EQUIPMENT; DESIGN; OPERATION; ACOUSTICS; ELECTRICAL PROPERTIES; MAGNETIC FIELDS; MODULATION; RESERVOIR ROCK; WELL CASINGS; WELLS; ELECTRIC LOGGING; EQUIPMENT; PHYSICAL PROPERTIES; WELL LOGGING; 440400* - Well Logging Instrumentation; 580000 - Geosciences

Citation Formats

Vail, III, W 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, W 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, W 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.
@article{osti_7083345,
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, W 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. 9 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {8}
}

Patent:
Search for the full text at the U.S. Patent and Trademark Office Note: You will be redirected to the USPTO site, which may require a pop-up blocker to be deactivated to view the patent. If so, you will need to manually turn off your browser's pop-up blocker, typically found within the browser settings. (See DOE Patents FAQs for more information.)

Save / Share: