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Materials 2018, 11(9), 1635; https://doi.org/10.3390/ma11091635

The Coupling Effect of O2 and H2S on the Corrosion of G20 Steel in a Simulating Environment of Flue Gas Injection in the Xinjiang Oil Field

1
School of Oil and Natural Gas Engnieering, Southwest Petroleum University, Chengdu 610500, China
2
Engineering Technology Institute, Xinjiang Oil Filed Company, CNPC, Karamay 834000, China
*
Author to whom correspondence should be addressed.
Received: 16 August 2018 / Revised: 31 August 2018 / Accepted: 3 September 2018 / Published: 6 September 2018
(This article belongs to the Section Materials Chemistry)
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Abstract

Flue gas injection for heavy oil recovery has received a great deal of attention, because it is more cost effective than lots of other injection methods. However, the corrosion could occur easily, because the flue gas usually contains corrosive gases such as CO2, H2S, and O2. In this work, the corrosion behaviors of G20 steel in flue gas injection environment simulating Xinjiang oil field (China) were investigated using weight loss measurement and surface characterization techniques. The effect of environments including the O2-containing environment, the H2S-containing environment, and the O2-H2S-coexisting environment on the corrosion of G20 steel in gas phase and liquid phase was discussed. The results show that the corrosion rate of G20 steel in the O2-H2S-coexisting environment is much higher than the sum of corrosion rates of the O2-containing environment and the H2S-containing environment, regardless of the gas phase and the liquid phase. This indicates that there is a coupling effect between O2 and H2S, which can further accelerate the corrosion of steel in O2-H2S-coexisting environment. The results of surface characterization demonstrate that in a typical flue gas injection environment, the corrosion products are composed of FeCO3, FeS, FeO(OH), and elemental sulfur. Elemental sulfur could obviously accelerate the corrosion of steel. Therefore, it can be considered that the coupling effect of O2 and H2S on corrosion of G20 steel in flue gas injection environment is caused by the formation of elemental sulfur in corrosion products. View Full-Text
Keywords: O2 Corrosion; H2S Corrosion; Combined Effect; Flue Gas Injection O2 Corrosion; H2S Corrosion; Combined Effect; Flue Gas Injection
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Zhong, X.; Wang, Y.; Liang, J.; Chen, L.; Song, X. The Coupling Effect of O2 and H2S on the Corrosion of G20 Steel in a Simulating Environment of Flue Gas Injection in the Xinjiang Oil Field. Materials 2018, 11, 1635.

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