抗高温高氧曼尼希碱缓蚀剂的制备与缓蚀性能*

Preparation and Corrosion Inhibition of Mannich Base Corrosion Inhibitor with High Temperature and High Oxygen Resistance

石 鑫 曾文广 刘冬梅 高秋英

SHI Xin，ZENG Wenguang，LIU Dongmei，GAO Qiuying

塔河油田具有高温高氧、矿化度高的工况条件，注水管线和注水井腐蚀现象严重。为有效缓解塔河油田腐 蚀严重的现状，以乙酸、苯甲胺、苯乙酮为原料合成曼尼希碱，再将其与表面活性剂（脂肪醇聚氧乙烯醚、脂肪醇 聚氧乙烯醚磷酸酯）等混合制得曼尼希碱缓蚀剂。在高温高压条件下，研究了溶解氧和氧含量对钢片腐蚀的影 响，通过失重法和电化学极化曲线法评价了缓蚀剂的性能。结果表明，溶解氧会加重管线的腐蚀，腐蚀速率随着 氧气浓度的增加不断增大。曼尼希碱缓蚀剂中的氨基与苯环形成富电子共轭体系，具有较强的吸附能力，缓蚀 率可达92.57%，缓蚀性能较好。曼尼希碱缓蚀剂为抑制阳极反应为主的混合抑制型缓蚀剂，可有效抑制高温高 氧条件下的腐蚀。图10表2参22

Tahe oilfield has a condition of high temperature，high oxygen and high salinity. The corrosion phenomenon of water injection pipeline and water injection well is serious. In order to effectively alleviate the serious corrosion situation of Tahe oilfield， Mannich base was synthesized by using acetic acid，benzylamine and acetophenone as raw materials，and then mixing it with surfactant（fatty alcohol polyoxyethylene ether，fatty alcohol polyoxyethylene ether phosphate），etc. to prepare Mannich base corrosion inhibitor. On the condition of high temperature and high pressure，the effect of dissolved oxygen and oxygen content on the corrosion of steel was investigated. The performance of inhibitor was evaluated by weight loss method and electrochemical test method. The results showed that the dissolved oxygen could increase the corrosion of pipeline. The corrosion rate increased with increasing oxygen concentration. The amino group and benzene ring in the Mannich base corrosion inhibitor formed an electron-rich conjugated system，which had a strong adsorption capacity. The inhibition rate could reach 92.57%，and the corrosion inhibition performance was good. Mannich base corrosion inhibitor was a mixed inhibition type corrosion inhibitor mainly for inhibiting anode reaction，which could effectively inhibit the corrosion under high temperature and high oxygen conditions.

10.19346/j.cnki.1000-4092.2020.03.023