镍磷镀油管在某油田注水井中的损伤原因  

Damage Reason of Tubing with Ni-P Plating in Water Injection Wells of an Oilfield

作　　者：朱丽娟 谢斌[4] 李纲要 黄新业 冯春 路彩虹 蒋龙[3] ZHU Lijuan;XIE Bin;LI Gangyao;HUANG Xinye;FENG Chun;LU Caihong;JIANG Long(State key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi'an 710077,China;Shaanxi Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,Xi'an 710077,China;Key Laboratory of Petroleum Tubular Goods Engineering,CNPC,Xi'an 710077,China;Engineering Technology Research Institute of Xinjiang Oilfield Company,Kelamayi 834000,China;Engineering Technology Department of Xinjiang Oilfield Company,Kelamayi 834000,China)

机构地区：[1]中国石油集团石油管工程技术研究院石油管材及装备材料服役行为与结构安全国家重点实验室,西安710077 [2]陕西省石油管材及装备材料服役行为与结构安全重点实验室,西安710077 [3]中国石油天然气集团公司石油管工程重点实验室,西安710077 [4]新疆油田公司工程技术研究院,克拉玛依834000 [5]新疆油田公司工程技术处,克拉玛依834000

出　　处：《腐蚀与防护》2020年第5期63-68,共6页Corrosion & Protection

基　　金：中国石油天然气股份有限公司重大科技专项(2018E-11-06);中国石油天然气集团公司基础研究和战略储备技术研究基金项目(2017Z-04)。

摘　　要：采用SEM、EDS和XRD等表征手段分析了在注水井中使用23~65个月的镍磷镀油管的表面腐蚀产物形貌、成分和结构,并对镍磷镀层和油管钢基体的失效原因和腐蚀机理进行探讨。结果表明:服役后,油管表面镍磷镀层均发生了不同程度的损伤,油管钢基体也发生了腐蚀,64.2%的镍磷镀油管因腐蚀引起的壁厚减薄大于标准要求(缺陷深度小于12.5%管体名义壁厚);镍磷镀层厚度太薄,油管前处理工艺不达标,以及Cl-引起的腐蚀是镍磷镀层失效的主要原因;镍磷镀层失效后,腐蚀介质直接与油管钢基体接触,发生溶解氧腐蚀、二氧化碳腐蚀和垢下腐蚀。Morphology,composition and structure of the corrosion products on the surface of Ni-P plated oil pipes used in water injection wells for 23 to 65 months were analyzed by means of SEM,EDS and XRD,and the failure causes and corrosion mechanisms of Ni-P coatings and basic steel were discussed.The results show that the Ni-P coating on the surface of the oil pipe suffered various degrees of damage after the service,and corrosion also occurred in the steel pipe substrate.64.2%of the Ni-P plated oil pipes had a thinner wall thickness due to corrosion than the standard requirement(The defect depth should less than 12.5%of the nominal wall thickness of the pipe body).The thickness of the Ni-P coating was too thin,the pretreatment process of the tubing was not up to standard,and the corrosion caused by Cl-was the main reason for the failure of the Ni-P coating.After the failure of the Ni-P coating,corrosive medium directly contacted the steel substrate of the pipe,dissolved oxygen corrosion,carbon dioxide corrosion,and subscale corrosion occurred.

关 键 词：镍磷镀层 腐蚀 油管 注水井 失效 

分 类 号：TG178[金属学及工艺—金属表面处理]