某海水管线系统中变径接头腐蚀穿孔原因分析
Analysis on Causes of Corrosion Perforation in Reducer Joints of Certain Offshore Pipeline System
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- 引用格式:
-
陈如江,张曼杰,金曦,赵大伟,薛艳,田增.某海水管线系统中变径接头腐蚀穿孔原因分析[J].天然气与石油,2013,31(4):0.doi:
.Analysis on Causes of Corrosion Perforation in Reducer Joints of Certain Offshore Pipeline System[J].Natural Gas and Oil,2013,31(4):0.doi:
- DOI:
- 作者:
- 陈如江1 张曼杰1 金 曦2 赵大伟2 薛 艳3 田 增3
- 作者单位:
- 1.中海石油（中国）有限公司深圳分公司番禺作业公司，2.中海石油能源发展股份有限公司上海采油技术服务分公司，3.西安摩尔石油工程实验室有限公司
- 关键词:
- 变径接头；腐蚀；穿孔
Reducer joint； Corrosion； Perforation
- 摘要:
- 某海水管线系统多次发现管线泄漏，经调查确认为10″~5″变径接头腐蚀穿孔所致。为避免此类泄露事故再次发生，有必要对此变径接头的腐蚀机理进行研究。通过对变径接头进行宏观和微观分析，对理化性能和金相组织进行检测，以及对腐蚀产物进行XRD分析。表明海水条件下焊缝处首先发生腐蚀，流速突增、湍流以及流场诱导作用最终导致变径接头出现腐蚀穿孔。为此需要优化变径接头结构并对焊缝处腐蚀情况进行监测。
Leakage is found many times in certain oilfield offshore pipeline system and investigation results show that such leakage is resulted from corrosion perforation in 10″-5″ reducer joints. In order to avoid leakage from occurring again，it is necessary to analyze corrosion mechanism of reducer joints. 10″ pipe body of reducer joint is welded together with variable diameter pipe into a whole body，the weld seam in the whole body will be firstly corroded by O2 and Cl- dissolved in seawater and the special structure of 10″-5″ reducer joint will also change seawater flow velocity and accelerate such corrosion. Conducted is macro and micro analysis on reducer joint，test are its physical and chemical properties and microstructure and conducted is XRD analysis on its corrosion products. Results obtained from analysis and test show that weld seams of reducer joints submerged in seawater will corrode firstly，where flow velocity may suddenly increase and turbulent flow and flow field action will occur successively，which will bring about corrosion perforation in reducer joints. Consequently，it is very important to optimize structure of reducer joints and monitor corrosion in weld seams.
