基于电磁技术的油气管道应力检测方法研究

Research on Stress Detection Method of Oil and Gas Pipeline Based on Electromagnetic Technology

为了实现对油气管道应力的实时监测,提出了一种基于电磁技术的管道应力检测方法。在磁机械效应的J-A模型基础上,对铁磁性材料力磁耦合关系进行数学建模,推导出应力与材料磁导率的函数关系;设计管道应力检测系统,并给出了管道表面漏磁信号与材料磁导率、激励电压和线圈匝数之间的数学关系;搭建管道打压实验平台,对管壁切向应力信号与管壁表面切向磁场分别进行测量。结果表明,当沿着管道切向方向励磁时,随着管道内压增加,管壁切向应力与管壁表面切向磁场变化趋势一致,且二者之间成较好的线性正相关关系,有利于长输油气管道应力检测技术的进一步发展。

In order to realize the real-time monitoring of oil and gas pipeline stress,a pipeline stress detection method based on electromagnetic technology was proposed.Based on the J-A model of magneto-mechanical effect,the force-magnetic coupling relationship of ferromagnetic materials was mathematically modeled,and the functional relationship between stress and material permeability was deduced.The pipe stress detection system was designed,and the mathematical relationship between the magnetic flux leakage signal on the pipe surface and the material permeability,the excitation voltage and the number of coil turns was given.The pipe pressure test platform was built to measure the tangential stress signal and the tangential magnetic field on the pipe wall.The results show that when exciting along the tangential direction of the pipeline,with the increase of internal pressure of the pipe,the tangential stress of the pipe wall and the tangential magnetic field of the pipe wall surface change in the same trend,and there is a good linear relationship between them,which provides theoretical basis for the further development of stress detection technology of long-distance oil and gas pipelines.