摘要
渤海某油田上游新平台投产后,海底管道输送介质中CO_(2)和H_(2)S含量逐年增加,海底管道腐蚀倾向增大。以油酸咪唑啉与甲醛反应形成双子咪唑啉结构,再通过氯化苄季铵化,最终与质量分数5%的硫脲复配成缓蚀剂HS-01。采用动态挂片质量损失法和扫面电镜(SEM)评价了缓蚀剂的缓蚀性能,结果表明:以油酸咪唑啉、甲醛、氯化苄质量比为1∶0.04∶0.3复配的缓蚀剂在加注质量浓度为10 mg/L、温度65℃、硫化氢质量浓度12.54 mg/L、二氧化碳分压/总压为0.35/2.0的极限海底管道腐蚀环境下,对X65碳钢的缓蚀率可达95%。油田现场试验,注水海底管道极化电阻法(LPR)在线监测结果显示:HS-01加注期间平均腐蚀速率为0.018 mm/a,较在用HS-29的0.039 mm/a有明显降低。混输海底管道腐蚀挂片监测结果表明:加注HS-01的两条混输海底管道平均腐蚀速率为0.008 mm/a,较HS-29往期数据的平均腐蚀速率0.013 mm/a改善明显。
After an oilfield in Bohai Sea was put into operation,the level of acid gas CO_(2)and H_(2)S elevated as well as the comprehensive water content further increased,so the corrosion tendency of submarine pipeline was enhanced.In this paper,oleic acid imidazoline formed by dehydration of oleic acid and diethylenetriamine reacted with formaldehyde to get gemini imidazoline structure,and then it was quaternized with benzyl chloride and finally mixed with 5%thiourea to obtain corrosion inhibitor HS-01.Performance of the inhibitor was studied by dynamic coupon mass loss method and scanning electron microscope(SEM).The results illustrated when the mass ratio of imidazoline,formaldehyde and benzyl chloride was 1∶0.04∶0.3,inhibition rate of X65 carbon steel can reach 95%under the extreme seawater corrosion environment with injection concentration of 10 mg/L,temperature of 65℃,hydrogen sulfide concentration of 12.54 mg/L and CO_(2)partial pressure/total pressure of 0.35/2.0.Online monitoring results of linear polarization resistance(LPR)method indicated the average corrosion rate of the submarine pipeline during HS-01 injection was 0.018 mm/a,which was significantly lower than that of 0.039 mm/a during HS-29 injection;Results of corrosion coupon tests showed the average corrosion rate of the two submarine mixed transportation pipelines filled with HS-01 was 0.008 mm/a,which was remarkably improved compared with the average 0.013 mm/a of HS-29 used in the past.
作者
万泊宏
WAN Bohong(CNOOC Tianjin Company,Tianjin 300452,China)
出处
《石油化工腐蚀与防护》
CAS
2021年第6期22-25,共4页
Corrosion & Protection In Petrochemical Industry
关键词
海底管道
季铵盐咪唑啉
缓蚀剂
腐蚀速率
缓蚀率
submarine pipeline
quaternary ammonium salt imidazoline
inhibitor
corrosion rate
inhibition rate