基于电磁耦合传感的小口径管道缺陷检测系统研发

Development of small-diameter pipeline defect detection system based on electromagnetic coupling sensing

石油和天然气管道在全球能源基础设施中发挥着至关重要的作用,管道在线内检测(ILI)技术是检测和评估管道完整性的重要工具,然而,它面临着诸多检测挑战,如不同类型缺陷的检出局限。该文提出一种基于电磁感应和永磁体复合磁化机理的新型ILI传感内检测系统。首先,提出一种可产生轴向漏磁场和周向均匀交流磁场的新型磁环结构(MRS);其次,通过添加永磁体磁化结构,优化励磁结构配置,增强管壁穿透能力和磁通强度;同时,在保证内检测器在小口径管道内安全通过下,克服单一技术限制,提高对浅表层缺陷和较深埋深缺陷的检测能力。为评估所提出的MRS系统的可行性,开展了管道牵拉测试,RMS与永磁铁励磁结构的最优配置,实现对深度0.81 mm表面浅缺陷和埋深4.1 mm的亚表面缺陷检出;最终,通过有限元仿真和实验以及牵拉测试有效验证了所提方法的检测能力。

Oil and gas pipelines play a vital role in the global energy infrastructure,and pipeline accidents may have serious impacts on the environment,human health,and the economy.In-line inspection(ILI)technology is an important tool for evaluating and analyzing pipeline integrity,however,it confronts significant obstacles such as the inability to identify various types of flaws.In this paper,a novel ILI sensing system based on the mechanism of electromagnetic induction and magnetization is proposed.Firstly,a new magnetic ring structure(MRS)that can generate axial magnetic flux leakage and circumferential uniform AC magnetic field was developed;secondly,the pipe wall penetration ability and magnetic flux were improved by adding a permanent magnet magnetization structure and optimizing the configuration of the excitation structure.It overcomes the detection performance constraint of a single detection technology and increases the detection capacity of shallow surface defects and deeper buried flaws while assuring the ILI in the high lift-off.A real-pipe pulling test was performed to assess the feasibility of the proposed MRS.Finally,the suggested method's detection and penetration abilities are effectively validated using finite element modeling,experiment,and pulling test.