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Title: Methods of operation of apparatus measuring formation resistivity from within a cased well having one measurement and two compensation steps

Abstract

Methods of operation of an apparatus having at least two pairs of voltage measurement electrodes vertically disposed in a cased well to measure the resistivity of adjacent geological formations from inside the cased well. During stationary measurements with the apparatus at a fixed vertical depth within the cased well, the invention herein discloses methods of operation which include a measurement step and subsequent first and second compensation steps respectively resulting in improved accuracy of measurement. First and second order errors of measurement are identified, and the measurement step and two compensation steps provide methods to substantially eliminate their influence on the results. A multiple frequency apparatus adapted to movement within the well is described which simultaneously provide the measurement and two compensation steps.

Inventors:
 [1]
  1. (Bothell, WA)
Issue Date:
Research Org.:
ParaMagnetic Logging, Inc. (Bothell, WA)
OSTI Identifier:
868834
Patent Number(s):
5223794
Assignee:
Para Magnetic Logging, Inc. (Woodinville, WA) RLO
DOE Contract Number:  
FG06-84ER13294
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
methods; operation; apparatus; measuring; formation; resistivity; cased; measurement; compensation; steps; pairs; voltage; electrodes; vertically; disposed; measure; adjacent; geological; formations; inside; stationary; measurements; fixed; vertical; depth; discloses; step; subsequent; respectively; resulting; improved; accuracy; errors; identified; provide; substantially; eliminate; influence; results; multiple; frequency; adapted; movement; described; simultaneously; compensation steps; apparatus adapted; vertically disposed; voltage measurement; measurement electrodes; geological formations; adjacent geological; formation resistivity; geological formation; multiple frequency; simultaneously provide; substantially eliminate; improved accuracy; discloses methods; fixed vertical; electrodes vertically; /324/

Citation Formats

Vail, III, William B. Methods of operation of apparatus measuring formation resistivity from within a cased well having one measurement and two compensation steps. United States: N. p., 1993. Web.
Vail, III, William B. Methods of operation of apparatus measuring formation resistivity from within a cased well having one measurement and two compensation steps. United States.
Vail, III, William B. Fri . "Methods of operation of apparatus measuring formation resistivity from within a cased well having one measurement and two compensation steps". United States. https://www.osti.gov/servlets/purl/868834.
@article{osti_868834,
title = {Methods of operation of apparatus measuring formation resistivity from within a cased well having one measurement and two compensation steps},
author = {Vail, III, William B.},
abstractNote = {Methods of operation of an apparatus having at least two pairs of voltage measurement electrodes vertically disposed in a cased well to measure the resistivity of adjacent geological formations from inside the cased well. During stationary measurements with the apparatus at a fixed vertical depth within the cased well, the invention herein discloses methods of operation which include a measurement step and subsequent first and second compensation steps respectively resulting in improved accuracy of measurement. First and second order errors of measurement are identified, and the measurement step and two compensation steps provide methods to substantially eliminate their influence on the results. A multiple frequency apparatus adapted to movement within the well is described which simultaneously provide the measurement and two compensation steps.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

Patent:

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