Inhibition of Imidazolines on CO2 Induced Corrosion of Carbon Steel in Oil and Water Alternatively Wetting Conditions

doi:10.11902/1005.4537.2023.209

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 707-715 DOI: 10.11902/1005.4537.2023.209

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Inhibition of Imidazolines on CO₂ Induced Corrosion of Carbon Steel in Oil and Water Alternatively Wetting Conditions

OUYANG Jialu¹, WANG Xixi¹, HAN Xia², WANG Ziming¹(

)

1. Center for Marine Materials Corrosion and Protection, College of Materials, Xiamen University, Xiamen 361005, China
2. Sinopec Petroleum Engineering Design Co., Ltd., Dongying 257026, China

Cite this article:

OUYANG Jialu, WANG Xixi, HAN Xia, WANG Ziming. Inhibition of Imidazolines on CO₂ Induced Corrosion of Carbon Steel in Oil and Water Alternatively Wetting Conditions. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 707-715.

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Abstract

Corrosion inhibitor is the most commonly used for corrosion control in oil production, but the relevant inhibition mechanism in complex CO₂ containing multiphase flow environment is still unclear. The effect of two typical oil-soluble and water-soluble imidazoline inhibitors on CO₂ induced corrosion of carbon steel in oil and water alternatively wetting conditions was investigated. It was found that the corrosion inhibition effect of the water-soluble imidazoline was better than that of the oil-soluble imidazoline, and the difference was mainly attributed to the performance of interface oil/water. The oil-soluble imidazoline molecules can improve the inhibition effect by enhancing the self-repair on the oil phase side, while the water-soluble imidazoline molecules can effectively inhibit the generation and growth of water droplets at the interface oil/water, weaken the rupture of CO₂ to the oil layer, and enhance the corrosion inhibition in dynamic wetting conditions.

Key words: CO₂ corrosion imidazoline inhibitor oil-water alternate wetting

Received: 01 July 2023 32134.14.1005.4537.2023.209

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52271075)

Corresponding Authors: WANG Ziming, E-mail: zmwang@xmu.edu.cn

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	OUYANG Jialu
	WANG Xixi
	HAN Xia
	WANG Ziming

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.209 OR https://www.jcscp.org/EN/Y2024/V44/I3/707

Fig.1 Infrared spectra of oil-soluble and water-soluble imidazoline inhibitors

Fig.2 Rupture time of oil layer on oil coated RCE in different solution systems under the conditions of 0 (a), 400 r/min (b) and 600 r/min (c), average rupture time at different rotating speeds (d) of oil layer

Fig.3 Localized corrosion morphologies of RCE after rupture of the oil layers in the solutions without (a-c) and with oil-soluble (d-f) and water-soluble (g-i) inhibitors

Fig.4 Potentiostatic polarization curves of RCE after dry-wet alternative exposure for 30 cycles at different rotating speeds in the carbonated solutions without (a) and with oil-soluble (b) and water-soluble (c) inhibitors, and correspondingly measured dissolution mitigation efficiency (DME) (d)

Fig.5 Measurement schemes (a, b) and statistical results (c, d) of dynamic contact angle (a, c) and water-in-oil static contact angle (b, d)

Table 1 Raman peaks of 100# mineral oil and 0.1 mol/L NaCl solution

Fig.6 Bulk (a, c) and interfacial (b, d) Raman peaks of water (a, b) and oil (c, d)

Fig.7 Relative areal ratios of Raman sub-peaks of water and oil under different conditions: (a) water peak, (b) oil peak 2848 cm^-1, (c) oil peak 2869 cm^-1, (d) oil peak 2927 cm^-1

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