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首页> 外文期刊>Magnetics, IEEE Transactions on >A Method for Improving SNR of Drill Pipe Leakage Flux Testing Signals by Means of Magnetic Concentrating Effect
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A Method for Improving SNR of Drill Pipe Leakage Flux Testing Signals by Means of Magnetic Concentrating Effect

机译：利用磁集中效应改善钻杆泄漏通量测试信号信噪比的方法

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摘要

Magnetic flux leakage (MFL) technique is generally considered as an efficient and effective nondestructive testing method, which has been widely used in the drill pipe detection in oil field. This paper aims at studying the magnetic concentrating effect, and proposing a method of gathering the MFL by means of magnetic concentrating device. Electromagnetic finite-element analysis shows that pipe MFL signals centralize near defects obviously and the leakage signals detected by Hall elements enhance greatly as magnetic concentrating structure can collect useful magnetic component. A drill pipe MFL experiment confirms the analysis results that the probe with magnetic concentrating device could obviously improve SNR of MFL signals, increase measuring the width of defects and reduce the requirements of liftoff value. Therefore, it is of great help to improve pipe leakage flux testing sensitivity.
机译：磁通量泄漏（MFL）技术通常被认为是一种有效的无损检测方法，已广泛用于油田钻杆检测中。本文旨在研究磁选效应，并提出一种利用磁选装置采集磁感应强度的方法。电磁有限元分析表明，管道MFL信号明显集中在缺陷附近，霍尔元件检测到的泄漏信号大大增强，因为磁集中结构可以收集有用的磁性成分。钻杆MFL实验证实了分析结果，该磁选仪探头可以明显提高MFL信号的信噪比，增加缺陷宽度的测量范围，降低对提离值的要求。因此，对提高管道泄漏通量测试的灵敏度有很大的帮助。

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