安全、健康和环境

2020, v.20(10) 34-38

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塔河油田注水井耐高温缓蚀剂复配研究
Study on Compound of High Temperature Corrosion Inhibitor for Water Injection Well in Tahe Oilfield

曾文广;李芳;胡广强;郭玉洁;张江江;刘斌;
Zeng Wenguang;Li Fang;Hu Guangqiang;Guo Yujie;Zhang Jiangjiang;Liu Bin;SINOPEC Northwest Oilfield Company,Research Institute of Petroleum Engineering;

摘要(Abstract):

由于塔河油田井下高Cl~-、高矿化度、低pH值、高温的基本特征,随着开发生产的进行,腐蚀问题日趋严重。为此,将咪唑啉缓蚀剂(A)、曼尼希酸化缓蚀剂(B)、喹啉季铵盐(C) 3种常见缓蚀剂按体积比A∶B∶C=1∶1∶1.5合成了一种新型的高温复合缓蚀剂,利用高温高压实验,电化学测试评价缓蚀剂的缓蚀性能并得出缓蚀机理。结果表明,复合缓蚀剂可以有效减缓P110套管钢的高温局部腐蚀,比市售的咪唑啉缓蚀剂更加适合在高温使用,140℃下缓蚀率可达90%以上。最佳使用温度不超过150℃,随温度升高,缓蚀剂的缓蚀效率下降。复合缓蚀剂是一种混合型缓蚀剂,主要抑制了阳极过程从而降低自腐蚀电流密度。同时,复合缓蚀剂没有改变腐蚀机理,主要通过几何覆盖效应增大腐蚀反应的转移电阻,降低腐蚀速率。
Due to the basic characteristics of high Cl-,high salinity,low pH value and high temperature in the downhole of Tahe oilfield,the corrosion problem has become increasingly serious with the development and production. Therefore,a new type of high temperature composite corrosion inhibitor was synthesized by three common corrosion inhibitors: imidazoline inhibitor( A),Mannich acidification inhibitor( B)and quinoline quaternary ammonium salt( C) according to the volume ratio A ∶ B ∶ C = 1 ∶ 1 ∶ 1. 5. The corrosion inhibition performance of the inhibitor was evaluated by high temperature and high pressure test,and electrochemical tests. The corrosion inhibition mechanism was obtained. The results showed that the composite corrosion inhibitor can effectively slow down the local corrosion of P110 pipe steel at high temperature which was more suitable for high temperature use than the current commercial imidazoline corrosion inhibitor. The corrosion inhibition rate can reach more than 90% at 140 ℃ . The optimal temperature of the composite corrosion inhibitor should not exceed 150℃ . As the temperature increases,the corrosion inhibitor' s corrosion efficiency decreases. Composite corrosion inhibitor was a kind of mixed corrosion inhibitor,which mainly inhibits the anodic process and reduces the self-corrosion current density. At the same time,the composite corrosion inhibitor did not change the corrosion mechanism but increased the transfer resistance of corrosion reaction and reduced the corrosion rate through the geometric covering effect.

关键词(KeyWords): 塔河油田;缓蚀剂;耐高温缓蚀剂;复配研究;腐蚀速率
Tahe oilfield;corrosion inhibitor;high temperature corrosion inhibitor;compound study;corrosion rate

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基金项目(Foundation): 国家“十三五”重大科技专项(2016ZX05053),塔里木盆地碳酸盐岩油气田提高采收率关键技术示范工程

作者(Author): 曾文广;李芳;胡广强;郭玉洁;张江江;刘斌;
Zeng Wenguang;Li Fang;Hu Guangqiang;Guo Yujie;Zhang Jiangjiang;Liu Bin;SINOPEC Northwest Oilfield Company,Research Institute of Petroleum Engineering;

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