Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Reexamination Certificate
2005-08-02
2005-08-02
Patidar, Jay (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
C324S220000, C324S235000, C324S238000
Reexamination Certificate
active
06924640
ABSTRACT:
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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http://www.batelle.org/pipetechnology/MFL/Links/SensorType.htm, Last modified: Sunday Oct. 1, 2000.
Gwan Soo Park and Eun Sik Park, “Improvement of the Sensor System in Magnetic Flux Leakage-Type Nondestructive Testing (NDT),” IEEE Transactions on Magnetics, vol. 38, No. 2 Mar. 2002, pp. 1277-1280.
Fickert Gary
Haynes John
McCollum Patrick H.
Patidar Jay
Precision Drilling Technology Services Group Inc.
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