Patent ID: 7538650
Filing Date: 2009-05-26
Classification: H01F

Abstract:
1. An apparatus for magnetizing a wellbore tubular, the apparatus comprising: a nonmagnetic frame, a track supported by the frame, the track configured to support a wellbore tubular, the track including a plurality of nonmagnetic rollers deployed on the frame, the rollers configured to support the tubular and to transport the tubular in a direction parallel with a cylindrical axis of the tubular; at least one motor deployed on the frame, the motor configured to drive at least one of the nonmagnetic rollers such that actuation of the motor transports the tubular along the track in a direction parallel with the cylindrical axis of the tubular; a plurality of coaxial magnetizing coils deployed on the frame, the coils being cylindrically coaxial with one another, the coils being further cylindrically coaxial with a tubular supported by the track, each of the coils being connected with an electrical power source, the combination of the coils and the power source being configured to produce a non-alternating magnetic field in a direction parallel with the cylindrical axis of the tubular; a magnetic sensor deployed on the frame, the magnetic sensor configured to measure a magnetic field emanating from a wellbore tubular along the length of the tubular as it is transported along the track; and an electronic controller in electronic communication with the magnetizing coils and the magnetic sensor.