对国内某大型气田油气混输管道失效管件进行了SEM观察、能谱分析、X衍射分析以及金相组织分析。结果表明, 腐蚀产物膜较疏松, 主要成分为FeCO3。油气混输管道的失效是天然气中的CO2气体溶于水中对管道的腐蚀以及高速流体对管壁冲刷共同作用的结果。针对失效情况, 提出了油气田安全生产相应的措施。

Some failed oil-gas transportation pipelines in a large scale gas field was analyzed by SEM, energy spectroscopy, X-ray diffraction and metallographic examination. The results show that the corrosion product was loose and the main component was FeCO3. The cause of the oil-gas transportation pipelines failure was the result of both the corrosion of CO2 dissolved in water in natural gas and the erosion of the high speed fluid on the pipe wall. Some corresponding measures were proposed for safe production of the field.