Method and apparatus for obtaining electrical images of a borehole wall through nonconductive mud
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United States of America Patent
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Issued Date -
Mar 18, 2004
app pub date -
Sep 16, 2002
filing date -
Sep 16, 2002
priority date (Note) -
Abandoned
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Abstract
A resistivity logging apparatus has an array of electrodes projecting from imaging pads. The electrodes penetrate nonconductive mud lining the borehole wall. Some of the electrodes are moveable in and out of the pad while others of the electrodes can be fixed. The electrodes, which are arranged in an array along a circumferential portion of the borehole wall, are able to make contact with the borehole wall. Sequencing electronics causes one electrode to be a source, another to be a measuring electrode, with the measurements of source electrode and measuring electrode moving along the array in order to log a circumferential portion of the borehole wall.
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