富含双键咪唑啉在饱和CO_(2)盐水中缓蚀行为研究  

Corrosion inhibition behavior of rich in double bonds imidazolines in saturated CO_(2) brine

作　　者：邹斌[1] 梁伟[1,2] 盖平原 陈晓春[3] 程仕键 付朝阳 ZOU Bin;LIANG Wei;GAI Pingyuan;CHEN Xiaochun;CHENG Shijian;FU Chaoyang(Shengli Oilfield Branch of Sinopec,Dongying,Shandong,China;Shandong Provincial Key Laboratory of Heavy Oil Recovery Technology,Dongying,Shandong,China;Xinjiang Xinchun Petroleum Development Co.,Ltd of Sinopec,Dongying,Shandong,China;School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan,Hubei,China)

机构地区：[1]中国石化胜利油田分公司 [2]山东省稠油开采技术省级重点实验室 [3]中国石化新疆新春石油开发有限责任公司 [4]华中科技大学化学与化工学院

出　　处：《石油与天然气化工》2024年第2期78-86,共9页Chemical engineering of oil & gas

基　　金：国家自然科学基金企业创新发展联合基金“难采稠油多元热复合高效开发机理与关键技术基础研究”(U20B6003);中石化集团公司重点科技攻关项目“锅炉烟气辅助蒸汽提高热采效果技术研究”(P20050-4)。

摘　　要：目的合成含有两个双键的亚油酸咪唑啉,与传统的含有单个双键油酸咪唑啉对比,研究其结构对其缓蚀性能的影响。方法在60℃下将Q235钢浸泡于饱和CO_(2)的3%(w)NaCl溶液中,通过失重、电化学测试和缓蚀效率测试,并通过表面分析方法观察腐蚀后钢片形貌变化,最后通过理论计算对合成缓蚀剂进行性能研究。结果电化学与失重结果显示在加入质量浓度为200 mg/L的亚油酸咪唑啉后,缓蚀效率能达到90%,缓蚀性能优于常见的油酸咪唑啉。在结构上,由于亚油酸咪唑啉分子比油酸咪唑啉多了一个双键,增加了咪唑啉缓蚀剂的吸附位点,使其能更好地吸附于金属的表面。结论亚油酸咪唑啉对碳钢有很好的缓蚀性能;在同等实验条件下,缓蚀性能优于油酸咪唑啉;其吸附满足Langmuir吸附等温线;吸附过程中主要通过N—Fe键吸附在Fe表面。Objective The linoleic acid imidazoline containing two double bounds was synthesized,and compared with the traditional oleic acid imidazoline containing a single double bond,the effect of its strcture on corrosion inhibition performance was studied.Methods Q235 steel was immersed in a 3 wt%NaCl solution saturated with CO_(2) at 60℃.Corrosion inhibition efficiency was evaluated through weight loss and electrochemical tests,and the morphological changes of the steel surface after corrosion were observed using surface analysis methods.The performance of synthesized corrosion inhibitor was also studied using theoretical calculations.Results The results show that after adding 200 mg/L of the linoleic acid imidazoline containing two double bonds,the corrosion inhibition efficiency can reach 90%,which is superior to the commonly used oleic acid imidazoline.Structurally,the linoleic acid imidazoline only differs from the oleic acid imidazoline by the presence of one additional double bond.This extra double bond increases the adsorption sites of the imidazoline corrosion inhibitor,which makes it better adsorb to the metal surface.Conclusions The linoleic acid imidazoline with two double bonds exhibits excellent corrosion inhibition performance on carbon steel and outperforms the oleic acid imidazoline under the same experimental conditions.The adsorption process conforms to the Langmuir adsorption isotherm,primarily adsorbing on the Fe surface through N—Fe bonding.

关 键 词：缓蚀剂 亚油酸咪唑啉 电化学评价 量子化学计算 分子动力学模拟 

分 类 号：TE980[石油与天然气工程—石油机械设备]