论文部分内容阅读
为了在现场能同时检测连续油管金属截面损耗缺陷 (LMA)和连续油管局部缺陷 (LF)两类磁特性完全不同的缺陷 ,做了连续油管缺陷综合检测传感器的磁路设计。传感器的励磁源选择具有较高性价比的钕铁硼永磁体NdFeB ,选用多回路励磁方式。为了获得较好的缺陷检测信号的信噪比 ,经过对磁路的理论计算和磁化曲线的分析 ,提出连续油管检测时磁场强度应选在磁化曲线的近饱和区。磁路尺寸参数设计时 ,磁轭和极靴的尺寸应尽量小 ,但又不能进入饱和区
In order to detect two completely different magnetic properties of coiled tubing metal fault (LMA) and coiled tubing local defect (LF) in the field at the same time, the magnetic circuit design of coiled tubing defect comprehensive detection sensor was made. The excitation source selection of the sensor has a high cost NdFeB permanent magnet NdFeB, multi-loop excitation method used. In order to obtain a better signal-to-noise ratio of the flaw detection signal, the theoretical calculation of the magnetic circuit and the analysis of the magnetization curve suggest that the magnetic field strength of the coiled tubing should be selected near the saturation region of the magnetization curve. Magnetic circuit size parameter design, yoke and pole shoe size should be as small as possible, but can not enter the saturation zone