Corrosion Behavior and Mechanism of 20 Steel under CO<sub>2</sub>/H<sub>2</sub>S Coexisted Environment in Oil and Gas Field

SONG Chengli; SONG Xiaojun; CHEN Qingguo; LI Kun; JIA Haidong; LI Guangshan

doi:DOI: 10.11973/jxgccl202303011

Materials and Mechanical Engineering > 2023 > 47(3): 60-65. > DOI: DOI: 10.11973/jxgccl202303011

SONG Chengli, SONG Xiaojun, CHEN Qingguo, LI Kun, JIA Haidong, LI Guangshan. Corrosion Behavior and Mechanism of 20 Steel under CO₂/H₂S Coexisted Environment in Oil and Gas Field[J]. Materials and Mechanical Engineering, 2023, 47(3): 60-65. DOI: DOI: 10.11973/jxgccl202303011

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Corrosion Behavior and Mechanism of 20 Steel under CO₂/H₂S Coexisted Environment in Oil and Gas Field

1. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an 710077, China;
2. PetroChina Tarim Oilfield Company, Koral 841000, China;
3. Pipeline Network Group (Xinjiang) United Pipeline Co., Ltd., Urumchi 830013, China

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Received Date: June 23, 2022
Revised Date: February 05, 2023

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Abstract

The high temperature and high pressure dynamic reactor was used to simulate the actual working conditions of CO₂ and H₂S coexisted environment in oil and gas field. The corrosion behavior of 20 steel at different CO₂ partial pressures (0.01, 0.05, 0.21, 0.50 MPa) and H₂S partial pressures (0.000 3, 0.003, 0.01, 0.05 MPa) and the degree of influence of CO₂ and H₂S partial pressure on uniform corrosion and pitting were studied by corrosion tests. The results show that under H₂S partial pressure of 0.003 MPa, when CO₂ partial pressure was 0.01, 0.05 MPa, uniform corrosion of 20 steel mainly occurred; with increasing CO₂ partial pressure, pitting became serious. Under CO₂ partial pressure of 0.05 MPa, when H₂S partial pressure was 0.000 3 MPa, 20 steel's surface corrosion was slight; with increasing H₂S partial pressure, the corrosion was intensified, but still uniform corrosion mainly occurred. H₂S and CO₂ partial pressure had a very significant impact on 20 steel's uniform corrosion rate and pitting rate; H₂S partial pressure had a relatively great effect on uniform corrosion, and CO₂ partial pressure had a relatively great effect on pitting.
- CO₂/H₂S coexisted environment,
- uniform corrosion,
- pitting,
- partial pressure,
- 20 steel

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