G - Physics – 01 – N
Patent
G - Physics
01
N
324/48
G01N 27/72 (2006.01) E21B 47/00 (2006.01) E21B 47/09 (2006.01) G01D 9/42 (2006.01) G01V 3/10 (2006.01)
Patent
CA 1160290
ABSTRACT OF THE INVENTION A combination of magnetics and a special geo- metric environment is employed to distinguish whether an instrument is positioned within a pipe formed of magne- tizable or non-magnetizable material, and is the basis in part, for a method and an apparatus used in controlling picture taking at the bottom of a well bore. A coil is energized repetitively in a circuit in which the voltage across the coil, or the current that flows through the coil, can be measured. Whether the coil is in a magnetic or non-magnetic environment is determined by the magnitude of the change in coil voltage or current.
324036
Pyatt Lawrence A.
Thompson Robert W.
Macrae & Co.
Pyatt Lawrence A.
Thompson Robert W.
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