某油田N80钢油管腐蚀失效的原因  

Corrosion Failure Causes for N80 Steel Tubing Used in a Oilfield

作　　者：黄本生[1] 卢杰 邓龙[1] 李佳宸[1] 

机构地区：[1]西南石油大学材料科学与工程学院,成都610500 [2]中国石油物资天津公司,天津300200

出　　处：《机械工程材料》2016年第1期93-97,共5页Materials For Mechanical Engineering

基　　金：四川省科技创新苗子工程项目(20131014);油气田材料重点实验室开放基金资助项目(x151514kcl34)

摘　　要：通过对某油田使用的N80钢油管的化学成分、显微组织、腐蚀形貌和腐蚀产物进行分析,探讨了该油管腐蚀失效的原因。结果表明:该油管的主要腐蚀形式为局部腐蚀,外壁主要表现为大面积的点蚀,内壁主要表现为涂层破坏引起的严重局部腐蚀;腐蚀介质中的O2、Cl-和S2-导致油管发生吸氧腐蚀、氯盐腐蚀和硫化物腐蚀,其中Cl-为主要的腐蚀介质;S2-和Cl-的协同作用会加速腐蚀产物膜的破坏,从而导致腐蚀加剧。Corrosion reasons for N80 steel tubing used in a oilfield were discussed by analyzing chemical composition, mierostrueture, corrosion morphology and corrosion products. The results show that the main corrosion forms of the tubing was local corrosion; outer wall showed a large area of pitting while inner walt manifested as severe local corrosion due to failure of corrosion coating. O2, Cl^- and S^2- in corrosion media caused oxygen-absorption corrosion, Cl^- corrosion and sulfide corrosion, Cl^- was the main corrosive media. Synergistic effect of S2- and C1 accelerated the destruction of corrosion product film, and thus leading to corrosion accelerating.

关 键 词：N80钢油管 腐蚀产物 Cl- 硫化物 

分 类 号：TG171.1[金属学及工艺—金属表面处理]