L320原油输送管道静置段的腐蚀机理
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摘要
选取某腐蚀穿孔L320输油管道静置段作为研究对象,通过现场调研、理化检验和电化学方法等方法,研究了原油输送管道静置段的腐蚀原因。结果表明,原油输送管道静置段的服役环境主要为含H_2S、CO_2、矿化物的油水混合介质,腐蚀失效主要集中在管道内壁的5～7点钟部位,腐蚀产物呈疏松状,含有S、O、C、Fe元素,失效的主导因素为含H_2S与CO_2的原油沉积水引起的局部腐蚀。此外,疏松状的腐蚀产物有加速腐蚀的作用,腐蚀形态也由局部腐蚀转变为均匀腐蚀。
The static section of a corrosion perforated L320 oil pipeline was selected as the research object.The corrosion causes of the stationary section of the crude oil pipeline were studied through field investigation,physical and chemical testing and electrochemical methods.The results show that the service environment of the stationary section of the crude oil pipeline was mainly oil-water mixed medium containing H_2 S,CO_2 and mineral compounds.Corrosion failure was mainly concentrated on the 5 to 7 o'clock position on the inner wall of the pipeline.The corrosion product was loose and contained S,O,C,and Fe elements.The dominant factor of failure was localized corrosion caused by crude oil deposited water containing H_2 S and CO_2.In addition,the loose corrosion products had the effect of accelerating corrosion,and the corrosion morphology was also changed from localized corrosion to uniform corrosion.
The static section of a corrosion perforated L320 oil pipeline was selected as the research object.The corrosion causes of the stationary section of the crude oil pipeline were studied through field investigation,physical and chemical testing and electrochemical methods.The results show that the service environment of the stationary section of the crude oil pipeline was mainly oil-water mixed medium containing H_2 S,CO_2 and mineral compounds.Corrosion failure was mainly concentrated on the 5 to 7 o'clock position on the inner wall of the pipeline.The corrosion product was loose and contained S,O,C,and Fe elements.The dominant factor of failure was localized corrosion caused by crude oil deposited water containing H_2 S and CO_2.In addition,the loose corrosion products had the effect of accelerating corrosion,and the corrosion morphology was also changed from localized corrosion to uniform corrosion.
引文
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[2]田嘉治,吕庆钢,羊东明,等.集输管内腐蚀失效原因分析[J].理化检验(物理分册),2013,49(12):843-847.
[3]李群,倪金波,王丹.输油站内管线腐蚀穿孔的控制[J].油气田地面工程,2012,31(10):58-59.
[4]倪广地,黄贤滨,张艳玲.原油输送管道内腐蚀原因分析[J].材料保护,2017,50(10):89-92.
[5] HUNG B,CHEN X H,ZHANG Y M,et al.Analysis of internal corrosion reasons for an old crude oil pipeline[C]//International Conference on Pipeline and Trenchless Technology 2014(ICPTT).Xiamen:American Society of Civil Engineers,2015:35-41.
[6]黄贤滨,倪广地,张艳玲,等.原油输送管道内腐蚀现状及最新研究进展[J].材料保护,2017,50(10):70-72,81.
[7] ZHU Q,CAO A,WANG Z,et al.Stray current corrosion in buried pipeline[J].Anti-Corrosion Methods and Materials,2011,58(5):234-237.
[8]程庆利,陶彬,刘栓,等.原油沉积水对Q235B碳钢的腐蚀影响[J].中国腐蚀与防护学报,2017,37(2):126-134.
[9]高德朋,俞虹,周芸芸,等.海岛环境下油罐腐蚀与防护现状分析[J].四川化工,2014,17(3):30-33.
[10]赵永峰.13Cr钢在CO2-H2S-Cl-体系中的腐蚀行为及其缓蚀技术研究[D].北京:北京化工大学,2010.
[11]张清,李全安,文九巴,等.CO2/H2S对油气管材的腐蚀规律及研究进展[J].腐蚀与防护,2003,24(7):277-281.
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