Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1979-09-13
1982-03-16
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
324253, G01N 2772, G01R 3304
Patent
active
043203400
ABSTRACT:
An improved well logging method and apparatus is provided for more reliable and accurate detection of corrosion in subsurface well casing. Method and apparatus are described for measuring the density of the flux field established inside the casing due to galvanic current flow longitudinally within the casing. A subsurface instrument housing a plurality of flux gates traverses the interior of the casing measuring the flux density within the casing. As the instrument comes proximate a corrosion location there will be detected a change in flux density due to current flowing from the casing into the formation. The detected change is transmitted to a surface location to provide an indication of the location and depth of corrosion.
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Scott, Gordon N., "An Outline of Some Problems In Oil Well Casing Corrosion," Paper presented at Spring Meeting of Pac. Coast Dist. of Prod. of API, May. 13-14, 1949.
Byron Richard M.
Dresser Industries Inc.
McCollum Patrick H.
Strecker Gerard R.
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