Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1987-02-05
1989-02-14
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324366, 324 62, G01R 2702
Patent
active
048049069
ABSTRACT:
An oil and gas well casing inspection tool is disclosed. The casing inspection tool comprises a body; inner and outer contact rollers extending from the body; means for generating a current between the outer contacts; and means for measuring a potential difference between the inner contacts. To enhance the accuracy of the device, capacitance is used downhole to increase the amount of current that can be supplied to the casing. Leaf springs engage the contact rollers to maintain a clean connection between the body and the casing. Signal coders and decoders are also disclosed.
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Carruth, Jr. Henry T.
Hamberg Allan
Peterson Mitchell F.
Thomas Elmer L.
Chevron Research Company
Eisenzopf Reinhard J.
Keeling Edward J.
LaPaglia S. R.
Mueller Robert W.
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