Determining resistivity of a formation adjacent to a borehole having casing with an apparatus having all current conducting electrodes within the cased well
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United States of America Patent
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N/A
Issued Date -
Apr 18, 2002
app pub date -
Jun 8, 2001
filing date -
Nov 4, 1986
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods of operation of different types of multiple electrode apparatus vertically disposed in a cased well to measure information useful to determine the resistivity of adjacent geological formations from within the cased well are described. The multiple electrode apparatus has a plurality of spaced apart voltage measurement electrodes that electrically engage a portion of the interior of the cased well. During measurements of information useful to determine formation resistivity, current is conducted between a first current conducting electrode in electrical contact with the interior of the cased well to a second current conducting electrode that is also in electrical contact with the interior of the cased well. The first and second current conducting electrodes are separated by a distance sufficient so that at least a portion of the current conducted between the first and second current conducting electrodes is conducted through the geological formation of interest.
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