Abstract
With the development of sour natural gas, the corrosive medium CO2, H2S, chloride and water content in the produced gas have been increasing year by year, and the problem of pipeline corrosion failure has become increasingly serious. It is of great significance to analyze the causes of pipeline failure and propose corresponding countermeasures. In this paper, a burst natural gas pipeline in an oil and gas processing station is taken as the research object. The macroscopic morphology, residual wall thickness, chemical composition, tensile properties and metallographic structure of the burst pipeline are analyzed and tested. Combined with the actual working conditions, the fluid accumulation position and serious scouring position of the pipeline are simulated and analyzed by using CFD simulation analysis method. The high partial pressure of CO2 leads to the pipeline running in a strong corrosive environment, which aggravates the corrosion. The direct cause of pipeline burst is that the pipeline is corroded and thinned seriously under the synergistic action of acid medium and flow corrosion, and the remaining wall thickness is not enough to bear the working pressure, and pipeline burst occurs instantly. It is suggested that the residual wall thickness at the low point of liquid accumulation in service pipeline system should be measured regularly or a real-time monitoring system should be installed.
Published Version
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