Method and apparatus for measuring mud resistivity in a wellbore

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Including borehole fluid investigation

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

324355, G01V 318, G01V 302

Patent

active

055743714

ABSTRACT:
A logging apparatus is adapted to be disposed in a mud filled wellbore, and a measurement probe is connected to a bottom of a tool string of the logging apparatus. The measurement probe is adapted for measuring a resistivity of a mud in the mud filled wellbore. The measurement probe includes a bottom electrode disposed on a bottom of the probe when the logging apparatus is disposed in the wellbore, a second electrode, and at least one measurement electrode disposed adjacent the bottom electrode for measuring a voltage potential drop in a region of the mud which is disposed directly below the bottom electrode of the measurement probe when the probe is disposed in the wellbore. When the measurement probe is energized, a current flows in the mud between the bottom electrode and the second electrode. When the current is initially emitted into the mud from the bottom electrode, and when the current is received from the mud in the bottom electrode, the current flows in a direction which is approximately parallel to a longitudinal axis of the logging apparatus tool string. Since the measurement electrode is disposed adjacent the bottom electrode, the measurement electrode measures the voltage potential drop in a region of the mud disposed directly below the bottom electrode. In addition, the voltage potential drop in such region measured by the measurement electrode is controlled primarily by the current being emitted from or received in the bottom electrode and flowing in such region.

REFERENCES:
patent: 2342827 (1944-02-01), Ackers
patent: 2838730 (1958-06-01), Lebourg
patent: 3518530 (1970-06-01), Wilson
patent: 3798535 (1974-03-01), Schuster
patent: 4677385 (1987-06-01), Chapman et al.
patent: 4949045 (1990-08-01), Clark et al.
patent: 5235285 (1993-08-01), Clark et al.
patent: 5339036 (1994-08-01), Clark et al.
patent: 5339037 (1994-08-01), Bonner et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for measuring mud resistivity in a wellbore does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for measuring mud resistivity in a wellbore, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for measuring mud resistivity in a wellbore will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-565251

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.