Research On Pipeline Detection Technology Based On Electromagnetic Ultrasound

Pipeline is the most important means of transport of oil and gas. Pipeline integrity and safety directly affect on the people's production, property and even life. Pipeline inspection is an important assistant and steel guards for the safe transportation of oil and gas.As the long construction of pipelines and pipeline service much more year, This is an urgent need for pipeline inspection technology, especially pipeline testing technology.The pipeline detection technology faces with these problems. For example,narrow space inside the pipeline, the surface uneven, uneven internal pressure and other issues. It makes that pipeline testing technology has become difficult to detect the difficulties. Electromagnetic ultrasonic testing technology has the advantages of high detection precision, wide detection range, no coupling agent, high temperature resistance, and good detection effect of pipeline corrosion defects and crack defects. It has become a new pipeline inspection technology.The object of this paper is the 813-X70 pipeline of Southwest Oil and Gas Field Company. Using Electromagnetic Ultrasonic NDT Technology study on Pipeline Defect Detection. First of all, this paper analyzes the basic model of 813-X70 EMAT pipeline detection technology through theory and simulation: The mathematical model and simulation of the EMAT transducer are studied. Using COMSOL Multi-physics Simulation Software Validates and Analyzes the Fundamentals of EMAT Transducers.The physical mode of ultrasonic guided wave mode and propagation in 813-X70 pipeline is studied. and the corresponding frequency velocity curve is obtained by using mathematical equation and numerical solution simulation. The characteristics and velocity characteristics of the ultrasonic guided wave in the pipeline 813-X70 are analyzed and summarized. The frequency range and mode of the electromagnetic ultrasonic guided wave 813-x70 pipeline are optimized. Secondly, the experiment of artificial and natural defects is designed for X70 pipeline inspection object in Southwest Oil and Gas Field. The various modal detection methods are discussed in detail by using the pipeline thickness EMAT sensor and the guided wave EMAT sensor. Dimensional,longitudinal and longitudinal stereoscopic test experiment on detection in the 813-X70 pipeline defect. That can get the multi-angle original detection signal of electromagnetic ultrasonic pipe inspection. Finally, The dif-time and echo amplitude are extracted from the pipeline EMAT signal by SPA and wavelet denoising, decomposition of the new original signal and Hilbert transform acquisition EMAT signal envelope et al. Using the feature quantity to construct the multi-dimensional weld weld defect assessment results of single-point, one-dimensional straight line and two-dimensional plane. Three dimensional angle three dimensional visualization constructing pipeline defects 3D graphic quantitative analysis and evaluation of pipeline weld defects.