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| Corrosion Characteristics of Low Cr-containing Tubing and Casing Steel under Various Service Conditions |
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| DOI：10.7643/issn.1672-9242.2022.11.013 |
| KeyWord:CO2 corrosion H2S corrosion tubing and casing steel corrosion morphology corrosion mechanism corrosion rate |
| Author | Institution |
| ZHANG Xiao-cheng |
State Key Laboratory of Offshore Oil Exploitation, CNOOC Limited, Tianjin Branch, Tianjin , China |
| LIN Hai |
State Key Laboratory of Offshore Oil Exploitation, CNOOC Limited, Tianjin Branch, Tianjin , China |
| LIAO Qian-hua |
State Key Laboratory of Offshore Oil Exploitation, CNOOC Limited, Tianjin Branch, Tianjin , China |
| LI Wen-bo |
State Key Laboratory of Offshore Oil Exploitation, CNOOC Limited, Tianjin Branch, Tianjin , China |
| DONG Ping-hua |
State Key Laboratory of Offshore Oil Exploitation, CNOOC Limited, Tianjin Branch, Tianjin , China |
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| Abstract: |
| The paper aims to study the corrosion characteristics of low chromium tubing and casing steel in different corrosion environments. High temperature and high pressure dynamic reactor is used to conduct corrosion experiments on 1Cr and 3Cr steels in pure CO2, CO2 and low concentration H2S environments. The results show that the corrosion rate of various steels increases with the temperature at 40 ℃-80 ℃. The addition of low concentration H2S can inhibit CO2 corrosion, and the inhibition gradually weakens as the temperature rises. According to the analysis, in CO2, CO2 and low concentration H2S environments, pitting corrosion of N80 steel will occur. Chromium enrichment occurs on the surface of 1Cr and 3Cr steels, and the formed Cr(OH)3 protects the substrate. At the same time, in CO2 and low concentration H2S environments, the amount of FeS product is formed on the surface of 1Cr and 3Cr steels. The dense FeS product helps protect the substrate and resist Cl- erosion. Passive film is formed on the surface of low Cr steel due to chromium enrichment, which can effectively inhibit the corrosion rate of steel. The research results have enriched the corrosion theory in CO2 and low concentration H2S environments and the reasonable selection of oilfield tubing and casing materials. |
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