A lift-off revision method for magnetic flux leakage measurement signal

Lisha Peng, Songling Huang, Shen Wang, Wei Zhao
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引用次数: 10

Abstract

Magnetic flux leakage (MFL) measurement technique is commonly used in oil and gas pipeline integrity detection and defect estimation. Subject to the measurement condition, the lift-off effect is unavoidable which will affect the strength and trend of MFL signal seriously. In order to weaken the lift-off effect, this paper proposed a lift-off revision method to revise the measured signal down to a considerable level. Firstly, two corresponding signals at different lift-offs are measured. Then the signals are revised by a lift-off revision formula which is deduced based on the trend and depth-combination property of MFL signal. To demonstrate the feasibility and accuracy of the proposed method, the lift-off is revised not only from the simulation signals, but also from the experimental data of an artificial corrosion defect. In both cases, the proposed method shows a good performance for the lift-off revision of MFL signal.
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漏磁测量信号的提升修正方法
漏磁测量技术是油气管道完整性检测和缺陷估计中常用的一种测量方法。根据测量条件的不同,不可避免地会产生升空效应,这将严重影响漏磁信号的强度和趋势。为了减弱升空效应,本文提出了一种升空修正方法,将实测信号修正到相当低的水平。首先,测量了不同升力下的两个对应信号。然后根据MFL信号的趋势和深度组合特性,推导出信号的升离修正公式,对信号进行修正。为了证明所提方法的可行性和准确性,不仅根据仿真信号,而且根据人工腐蚀缺陷的实验数据对升力进行了修正。在这两种情况下,所提出的方法都显示出良好的增益校正性能。
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