Resistivity measurement system for drilling with casing

Details Resistivity measurement system for drilling with casing Resistivity measurement system for drilling with casing

1991-10-21

1992-12-08

Dang, Hoang C.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Indicating, testing or measuring a condition of the formation

175107, 175258, E21B 4900, E21B 400

Patent

active

051689421

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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patent: 4955438 (1990-09-01), Juergens et al.
patent: 5052502 (1991-10-01), Jurgens et al.

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