季铵盐缓蚀剂在高温高压电化学环境下缓蚀行为研究  

Study on Corrosion Inhibition Behavior of Quaternary Ammonium Salt Corrosion Inhibitor in High Temperature and High Pressure Electrochemical Environment

作　　者：刘寒梅[1] 张通 宋建涛 艾兵权 李艾峰 罗腾文 LIU Han-mei;ZHANG Tong;SONG Jian-tao;AI Bing-quan;LI Ai-feng;LUO Teng-wen(Yanchang Oilfield Co.,Ltd.Jingbian Oil Production Plant,Yan'an Shaanxi 717500,China;Yan'an Zhongshida Oil&Gas Engineering Technology Service Co.,Ltd.,Yan'an Shaanxi 717500,China)

机构地区：[1]延长油田股份有限公司靖边采油厂,陕西延安717500 [2]延安中石大油气工程技术服务有限公司,陕西延安717500

出　　处：《当代化工》2022年第3期585-588,593,共5页Contemporary Chemical Industry

基　　金：国家科技重大专项课题,耐高温高性能钻井液体系及井筒强化技术(项目编号:2019ZX05005-005)。

摘　　要：在油气田的开发和运营中,设备和管道面临着严苛的腐蚀环境,绝大多数研究只针对缓蚀剂在常温常压的缓蚀行为,而对于高温高压环境下这种实际应用环境的缓蚀剂开发和研究较少。基于以上问题,选用并制备两种季铵盐缓蚀剂,使用电化学高温高压釜模拟油气田环境,通过电化学方法以及SEM和EDS表征,研究了N80钢在模拟油气田环境下的电化学行为。结果表明:季铵盐缓蚀剂OICQ能在72 h的反应时间下,仍保持较好的缓蚀效果;高温高压环境下,当OICQ与TU比例为5∶1时,协同效应最好,缓蚀率最高为99.5%;通过SEM和EDS分析可知,当添加OICQ和TU的复合缓蚀剂时,TU可以快速吸附在金属表面,形成吸附膜,吸附在金属表面的OICQ分子既能阻止腐蚀介质向基体的扩散,又能抑制TU分子的脱附,从而提高了缓蚀效果,表现出了优异的协同作用。In the development and operation of oil and gas fields, equipment and pipelines face harsh corrosion environments. Most of the research on the corrosion inhibitor behavior are at room temperature and normal pressure,and the development and research of corrosion inhibitors in the actual application environment under high temperature and high pressure environments are less. Based on the above problems, two quaternary ammonium salt corrosion inhibitors were selected and prepared. The electrochemical high-temperature autoclave was used to simulate the oil and gas field environment, and the electrochemical behavior of N80 steel in the simulated oil and gas field environment was studied through electrochemical methods, SEM and EDS characterization. The results showed that the quaternary ammonium salt corrosion inhibitor OICQ still maintained good corrosion inhibition effect under a reaction time of 72 h;in a high temperature and high pressure environment, when the ratio of OICQ to TU was 5∶1,the synergistic effect was the best. The highest corrosion rate was 99.5%. Through SEM and EDS analysis, it was seen that when the compound corrosion inhibitor of OICQ and TU was added, TU quickly adsorbed on the metal surface to form an adsorption film. The OICQ molecules attached to the metal surface both prevented the diffusion of the corrosive medium to the substrate and inhibited the desorption of TU molecules, thus improving the corrosion inhibition effect and showing excellent synergistic effects.

关 键 词：季铵盐缓蚀剂 高温高压环境 缓蚀行为 协同作用 

分 类 号：TG172.2[金属学及工艺—金属表面处理]