| HUANG Qiang.Research on Corrosion Behavior of Ground Gathering Pipeline under CO2/H2S/O2 System[J],50(4):351-360 |
| Research on Corrosion Behavior of Ground Gathering Pipeline under CO2/H2S/O2 System |
| Received:May 12, 2020 Revised:August 30, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.04.037 |
| KeyWord:heavy oil thermal recovery gathering pipeline CO2/H2S/O2 coexistence system corrosion behavior temperature |
| Author | Institution |
| HUANG Qiang |
Xinjiang Petroleum Engineering Co. Ltd, Karamay , China |
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| Abstract: |
| To study the corrosion behavior of commonly used steel in gathering pipelines under the CO2/H2S/O2 system, and to provide guidance for the corrosion prevention and control of gathering pipelines in Xinjiang Oilfield. Based on the working conditions of heavy oil thermal recovery in Xinjiang Oilfield, using L245NS steel as the test material and 316L steel as the control, the high temperature autoclave test was used to study the influence of temperature and H2S content on the corrosion of L245NS steel and 316L stainless steel in the CO2/H2S/O2 system, and combined with SEM/EDS+XPS+3D microscope and other means to test and analyze the corrosion products under typical working conditions. The result shows that in the CO2/H2S/O2 coexistence system, the corrosion rate of L245NS steel increases first and then decreases with increasing temperature, and decreases first and then increases with increasing H2S content; the corrosion rate of 316L steel increases first and then decreases with the increase of temperature, and it increases with the increase of H2S content. The corrosion products of L245NS steel are in the form of needles, rhomboid and granules, while the corrosion products of 316L steel are few; In the CO2/H2S/O2 coexistence system, the corrosion products of L245NS steel mainly include FeS, FeS2, elemental S, FeCO3, Fe(OH)3, FeOOH, Fe3O4, Fe2O3, |
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