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

doi:10.11902/1005.4537.2016.018

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

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

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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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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

Received: 25 January 2016

Fund: Supported by National Natural Science Foundation of China (51571098)

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	Shuaihao HAN
	Hongyu CEN
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	Xingpeng GUO

Cite this article:

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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.018 OR https://www.jcscp.org/EN/Y2017/V37/I3/221

Table 1 Weight loss experiment results of N80 steel at different CO₂ partial pressures (80 ℃)

Table 2 Mass loss experiment results of N80 steel at different temperatures (2.5 MPa)

Fig.1 Polarization curves of N80 steel under different conditions (80 ℃, 2.5 MPa)

Table 3 Electrochemical parameters obtained from polarization curves in Fig.1 (80 ℃, 2.5 MPa)

Fig.2 EIS of N80 steel under different conditions (80 ℃, 2.5 MPa)

Fig.3 Equivalent circuit models for fitting the impedance spectroscopies of N80 steel in different simulated solutions with additions of null or crude oil (a), imidazoline inhibitor or imidazoline inhibitor+crude oil (b)

Table 4 Fitting parameters of EIS of N80 steel

Fig.4 Morphologies of water droplets on N80 steel immersed in different solutions with additions of null (a), crude oil (b), imidazoline inhibitor (c) and imidazoline inhibitor and crude oil (d)

Fig.5 Corrosion morphologies of N80 steel in different simulated solutions with additions of null (a), crude oil (b), imidazoline inhibitor (c) and imidazoline inhibitor and crude oil (d)

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