Oil and gas well tubular inspection system using hall effect...

Details Oil and gas well tubular inspection system using hall effect... Oil and gas well tubular inspection system using hall effect...

G - Physics

01

V

G01V 3/26 (2006.01) E21B 47/04 (2006.01) E21B 47/10 (2006.01) E21B 47/12 (2006.01) E21B 49/00 (2006.01) G01N 27/82 (2006.01) G01N 27/83 (2006.01) G01N 27/90 (2006.01) G01R 33/07 (2006.01)

Patent

CA 2448172

An inspection system for detecting flaws in oil and gas well borehole ferromagnetic tubulars. The inspection device operates inside the tubular by first saturating tubular wall with magnetic flux. Flaws in the wall causes flux leakage, and the magnitude of the flux leakage are measured with Hall effect sensors disposed within the inspection device. The magnitude of flux leakage is then related to the amount of ferromagnetic material loss resulting from the flaw. Eddy currents induced in the wall are also measured and combined with the Hall effect sensor measurements to define location and geometric shape of the flaw.

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