Resistivity measurement system for drilling with casing
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United States of America Patent
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-
Dec 8, 1992
Grant Date -
N/A
app pub date -
Oct 21, 1991
filing date -
Oct 21, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A system for measuring earth formation resistivity while drilling a wellbore through an earth formation using a self-contained drilling assembly supported at the lower end of a casing string. The drilling assembly includes a drilling fluid driven motor driving a drill bit, where the motor and bit are electrically isolated from the casing string. Formation resistivity measuring circuitry is provided in the assembly. Data transmission mechanism is provided for encoding the resistivity data and transmitting it through the drilling fluid to the surface location of the wellbore.
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