油田产出水中饱和CO_2和SRB共存条件下十二胺缓蚀剂的缓蚀行为

Inhibition Behavior of Dodecylamine Inhibitor in Oilfield Produced Water Containing Saturated CO_2 and SRB

采用电化学阻抗谱、动电位极化、失重及超景深三维立体显微镜观察,研究了饱和CO2和硫酸盐还原菌(SRB)共存条件下十二胺缓蚀剂对20号钢的短期缓蚀行为。结果表明,无SRB存在条件下,缓蚀剂的缓蚀率高达95.8%。接种10%SRB恒温培养11d后,当缓蚀剂浓度低于20mg/L时,无缓蚀效果;当缓蚀剂浓度达到100mg/L时,缓蚀效果最好,失重数据表明缓蚀剂的缓蚀率可以达到85.2%。不同体系的SRB菌量测定结果表明,缓蚀剂对SRB具有一定的毒性作用,可以显著抑制SRB的生长。去除腐蚀产物的形貌表明,SRB和CO2共存时试样以均匀腐蚀为主,局部有明显的点蚀;加入100mg/L缓蚀剂后,试样腐蚀较轻,以少量的点蚀为主。

The short-term corrosion inhibition performance of dodecylamine for 20^# carbon steel in the presence of saturation CO2 and sulfate-reducing bacteria（SRB）was investigated by electrochemical impedance spectroscopy（EIS）,potentiodynamic polarization,weight loss method and three-dimensional stereogram.The results showed that the corrosion inhibitor exhibited high inhibition efficiency,reaching 95.8%in the absence of SRB.After inoculating10% SRB and cultivating for 11 days at stationary temperature,when the concentration of corrosion inhibitor was less than 20mg/L,the corrosion inhibition performance was worse;when the concentration of corrosion inhibitor reached100 mg/L,the inhibition efficiency could reach 85.2% depending on weight loss method.The SRB content measurements indicated that the corrosion inhibitor had toxicity for SRB and could inhibit the growth of SRB.The corrosion morphology of specimens indicated that the specimen produced uniform corrosion accompanied by pitting corrosion in the presence of SRB and CO2;when adding 100mg/L corrosion inhibitor,the corrosion of specimen was lighter,and accompanied by a little pitting corrosion.