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Effect Of H2S On CO2 Corrosion Of Mild Steel In HPHT Conditions

Picture for Effect Of H2S On CO2 Corrosion Of Mild Steel In HPHT Conditions
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Product Number: 51321-16622-SG
Author: Yoon-Seok Choi/ Fernando Farelas/ Luciano Paolinelli/ Srdjan Nesic/ Ahmad Zaki B Abas/ Azmi Mohammed Nor/ Muhammad Firdaus Suhor
Publication Date: 2021
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The effect of H2S on the aqueous corrosion behavior of mild steel was evaluated at HPHT conditions (supercritical CO2 pressure) at a total pressure of 12 MPa and a temperature of 160°C. The corrosion rate of steel samples was determined by electrochemical and weight loss measurements. The surface/cross-sectional morphology and the composition of the corrosion product layers were analyzed by using surface analytical techniques (SEM, EDS, and XRD). Results showed that the corrosion rate decreased with time and no significant difference was observed in the presence of 1000 and 2000 ppm of H2S at HPHT CO2 conditions. Surface and cross-sectional analyses revealed that the corrosion process is governed by the formation of FeCO3 regardless of the presence of H2S. Furthermore, the corrosion behavior of mild steel in these conditions did not depend significantly on flow velocity.

Key words: Supercritical CO2, CO2 corrosion, carbon steel, H2S, high temperature

The effect of H2S on the aqueous corrosion behavior of mild steel was evaluated at HPHT conditions (supercritical CO2 pressure) at a total pressure of 12 MPa and a temperature of 160°C. The corrosion rate of steel samples was determined by electrochemical and weight loss measurements. The surface/cross-sectional morphology and the composition of the corrosion product layers were analyzed by using surface analytical techniques (SEM, EDS, and XRD). Results showed that the corrosion rate decreased with time and no significant difference was observed in the presence of 1000 and 2000 ppm of H2S at HPHT CO2 conditions. Surface and cross-sectional analyses revealed that the corrosion process is governed by the formation of FeCO3 regardless of the presence of H2S. Furthermore, the corrosion behavior of mild steel in these conditions did not depend significantly on flow velocity.

Key words: Supercritical CO2, CO2 corrosion, carbon steel, H2S, high temperature

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51318-11193-Corrosion Inhibition of Carbon Steel under Supercritical CO2/H2S Environment

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Author: Yoon-Seok Choi / Shokrollah Hassani / Thanh Nam Vu / Srdjan Nesic
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Experiments were carried out in a 7.5L autoclave with two combinations of CO2 partial pressure and temperature and different H2S concentrations. Corrosion behavior of specimens was evaluated using electrochemical measurements and surface analytical techniques.
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Fe3O4, FeCO3 or FeS - Which Corrosion Product Will Prevail at High Temperature in CO2/H2S Environments?

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Sweet (CO2) and sour (H2S) corrosion have continuously been a challenge in oil and gas production and transportation. Yet, some key issues are still not well understood, especially at high temperature production conditions. A CO2/H2S ratio of 500, which has been used (often inaccurately) to determine which corrosion mechanism is dominant, is probably even less valid at high temperature. The nature of the corrosion products forming at high temperature in CO2/H2S environments and their effects on the corrosion rate are not known. Finally, the impact on pipeline integrity of environmental changes between sweet and sour production conditions (simulating reservoir souring) has not been well documented. CO2, H2S, and CO2/H2S corrosion experiments were conducted at 120oC to investigate corrosion mechanisms and corrosion product layer formation at high temperature. The results show that the corrosion products were still clearly dominated by H2S under the pCO2/pH2S ratio of 550. Formation of Fe3O4, FeCO3, and FeS corrosion product layers had a direct impact on the measured corrosion rates and was dependent on the gas composition and on the sequence of exposure (CO2 then H2S and vice versa). Compared with H2S corrosion alone, the presence of CO2 could retard Fe3O4 formation in CO2/H2S mixture environment. No obvious change in steady state corrosion rate was observed when the corrosion environment was switched from CO2 to H2S and vice versa. 
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Product Number: 51300-11293-SG
ISBN: 2011 11293 CP
Author: Wenhui Hao, Lei Zhang, Han Li, Minxu Lu and Lining Xu
Publication Date: 2011
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