A Lift-Off-Tolerant Magnetic Flux Leakage Testing Method for Drill Pipes at Wellhead

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Wu, Jianbo; Fang, Hui; Li, Long; Wang, Jie; Huang, Xiaoming; Kang, Yihua; Sun, Yanhua; Tang, Chaoqing;
  • Publisher: MDPI
  • Journal: Sensors (Basel, Switzerland),volume 17,issue 1 (eissn: 1424-8220)
  • Related identifiers: pmc: PMC5298774, doi: 10.3390/s17010201
  • Subject: lift-off distance | MFL (magnetic flux leakage) | drill pipe | magnetic field focusing | Article

To meet the great needs for MFL (magnetic flux leakage) inspection of drill pipes at wellheads, a lift-off-tolerant MFL testing method is proposed and investigated in this paper. Firstly, a Helmholtz coil magnetization method and the whole MFL testing scheme are propose... View more
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