原油与高压CO<sub>2</sub>共存条件下咪唑啉缓蚀剂的作用行为研究

doi:10.11902/1005.4537.2016.018

中国腐蚀与防护学报

2017, Vol. 37

Issue (3): 221-226 DOI: 10.11902/1005.4537.2016.018

本期目录 | 过刊浏览

原油与高压CO₂共存条件下咪唑啉缓蚀剂的作用行为研究

韩帅豪¹,岑宏宇¹,陈振宇^1,²(

),邱于兵²,郭兴蓬^1,²

1 华中科技大学化学与化工学院材料化学与服役失效湖北省重点实验室武汉 430074
2 华中科技大学化学与化工学院能量转换与存储材料化学教育部重点实验室武汉 430074

Inhibition Behavior of Imidazoline Inhibitor in Corrosive Medium Containing Crude Oil and High-Pressure CO₂

Shuaihao HAN¹,Hongyu CEN¹,Zhenyu CHEN^1,²(

),Yubing QIU²,Xingpeng GUO^1,²

1 Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2 Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, China

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摘要:

采用动态失重挂片、高温高压电化学测试、接触角测试及扫描电镜等手段,在80 ℃、2.5 MPa CO₂条件下模拟饱和CO₂油田采出水,研究原油与高压CO₂共存条件下咪唑啉缓蚀剂对N80钢的缓蚀作用。结果表明：在含有咪唑啉缓蚀剂的腐蚀介质中加入原油后,电极的开路电位有所增加,电极的电荷传递电阻显著变大,碳钢对水的润湿性明显降低,缓蚀剂在金属表面覆盖更完整,原油显著增强了咪唑啉缓蚀剂的缓蚀性能。

关键词 ： CO₂腐蚀, 咪唑啉缓蚀剂, N80钢, 原油

Abstract：

Effect of crude oil on the inhibition behavior of imidazoline inhibitor were illustrated by dynamic mass loss method, electrochemical test, contact angle measurement, scanning electron microscopy etc. The oilfield produced water was simulated in the presence of CO₂ under pressure of 2.5 MPa at 80 ℃, then in the above corrosive medium the corrosion inhibition performance of imidazoline corrosion inhibitor for N80 steel was assessed. The results showed that the open circuit potential and charge transfer resistance of the carbon steel increased when adding crude oil into the corrosive medium which contained imidazoline corrosion inhibitor. It is also found that the wettability of carbon steel surface against water was reduced obviously and the coverage of the inhibitor film became more complete, whilst the inhibition efficiency increased greatly after introducing crude oil into the oilfield produced water.

Key words： CO₂ corrosion imidazoline corrosion inhibitor N80 steel crude oil

收稿日期: 2016-01-25

基金资助:国家自然科学基金 (51571098)

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引用本文:

韩帅豪,岑宏宇,陈振宇,邱于兵,郭兴蓬. 原油与高压CO₂共存条件下咪唑啉缓蚀剂的作用行为研究[J]. 中国腐蚀与防护学报, 2017, 37(3): 221-226.
Shuaihao HAN, Hongyu CEN, Zhenyu CHEN, Yubing QIU, Xingpeng GUO. Inhibition Behavior of Imidazoline Inhibitor in Corrosive Medium Containing Crude Oil and High-Pressure CO₂. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 221-226.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.018 或 https://www.jcscp.org/CN/Y2017/V37/I3/221

表1 在不同CO2分压下N80钢的失重实验结果 (80 ℃)

表2 在不同温度下N80钢的失重实验结果 (2.5 MPa)

图1 在不同条件下N80钢的极化曲线 (80 ℃, 2.5 MPa)

表3 从图1中的极化曲线计算得到的电化学参数 (80 ℃, 2.5 MPa)

图2 在不同条件下N80钢的电化学阻抗谱 (80 ℃, 2.5 MPa)

图3 电化学阻抗谱等效电路模型

表4 N80钢的电化学阻抗谱拟合结果

图4 在不同条件下N80钢表面水滴的形貌图

图5 在不同条件下N80钢的腐蚀形貌 (80 ℃, 2.5 MPa)

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