摘要
地面集输管线的腐蚀穿孔是影响油气田安全生产的主要隐患之一。西部某油田新建20G原油输送管线在服役1年后便发生腐蚀穿孔,通过宏观检查、管体理化性能检测和腐蚀产物分析等试验手段,分析了该管线腐蚀穿孔的原因。试验结果表明,由于该管线内部输送介质流速较小,水相在管道底部沉积,而介质中的CO_2、H_2S和地层水对管线造成腐蚀,其中地层水中高浓度的氯离子能够促进点蚀的形核及发展,从而导致管线穿孔。
The corrosion perforation of the ground gathering pipeline is one of the main problems that affect the safe production of oil and gas fields, A 20G crude-oil-transporting pipeline in a western oil field was corroded and perforated after one year usage, The present work analyzed its failure causes by the macro inspection, physical and chemical performance test and corrosion products characterization, Experimental results show that the causes of pipeline perforation lie in two aspects： first, the flow rate of its internal transmission medium is so small that aqueous medium is apt to accumulate at the bottom of the pipeline; second, the corrosive CO2, H2S, and formation water in the aqueous medium would cause corro-sion of pipeline,especially the high concentration of chloride ions can promote pitting nucle-ation and development,and then result in the pipeline perforation.
出处
《油气田地面工程》
2016年第9期31-34,共4页
Oil-Gas Field Surface Engineering
关键词
20G钢管
管线
腐蚀穿孔
地层水
20G steel pipeline
pipeline
corrosion perforation
formation water
