Well logging apparatus having toroidal induction antenna for measuring, while drilling, resistivity of earth formations
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United States of America Patent
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-
Aug 10, 1993
Grant Date -
N/A
app pub date -
Oct 31, 1991
filing date -
Oct 31, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus is disclosed for determining the resistivity of formations surrounding an earth borehole. An electrically conductive metal body, such as a drill collar on a drill string, is movable through the borehole. A transmitting toroidal coil antenna is disposed on the body and is energized to induce a current which travels in a path that includes the body and the formations. An electrode is disposed on the body, and an electrical signal resulting from said current is measured at the electrode to obtain an indication of the resistivity of the formations. In a disclosed embodiment, one or more electrodes can be mounted on a blade that is mechanically coupled to the body.
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