Method and apparatus for indicating well casing corrosion

Details Method and apparatus for indicating well casing corrosion Method and apparatus for indicating well casing corrosion

G - Physics

01

N

324/50

G01N 27/72 (2006.01) E21B 47/09 (2006.01) G01N 17/00 (2006.01) G01N 27/82 (2006.01) G01V 3/26 (2006.01)

Patent

CA 1160292

METHOD AND APPARATUS FOR INDICATING WELL CASING CORROSION ABSTRACT OF THE DISCLOSURE 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.

358079

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