Improvements in Flux Leakage Assessment of Tubulars and Other Goods

摘要

Numerous commercial inspection units for oilfield tubular goods(OCTG)exist,but the general idea behind them has not changed much since the Moho Project.This paper traces the development of the sensors used,from the simple inductive coil to hall element arrays,and what information can be extracted from them.The basic problems caused by the use of MFL amplitudes only as an indicator of imperfection size,as opposed to the use of other possible signal parameters is presented.Newer methods of signal processing include 3-D maps of MFL from flaws,and guidance is provided on how to improve the accuracy of current pipe inspection tools.