| FENG Huan-zhi,XING Xi-jin,XIE Ren-jun,HE Song.Corrosion Behavior of Super 13Cr Stainless Steel in Environment with High CO2 Level[J],45(5):72-78 |
| Corrosion Behavior of Super 13Cr Stainless Steel in Environment with High CO2 Level |
| Received:January 16, 2016 Revised:May 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.05.011 |
| KeyWord:high CO2 partial pressure super 13Cr tubing and casing Dong Fang gas field corrosion behavior |
| Author | Institution |
| FENG Huan-zhi |
CNOOC Research Institute, Beijing , China |
| XING Xi-jin |
CNOOC Research Institute, Beijing , China |
| XIE Ren-jun |
CNOOC Research Institute, Beijing , China |
| HE Song |
CNOOC Research Institute, Beijing , China |
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| Abstract: |
| Objective To analyze the corrosion behavior of super 13Cr and evaluate its anti-corrosion ability in high CO2 level condition. The result can support material selection work for similar gas fields. Methods High temperature/pressure corrosion coupon test and electrochemical test were conducted in simulated Dong Fang gas field high CO2 level environment (141 ℃， CO2 27.9 MPa). Results The corrosion coupon test result indicated that the corrosion type of super 13Cr was general corrosion with a corrosion rate of 3×10-3 mm/a. The electrochemical test showed that the corrosion potential and pitting potential of 13Cr (-0.785 V, -0.301 V) had an obvious negative shift compared to super 13Cr (-0.580 V, -0.139 V). The corrosion current density and passivation current density of 13Cr were obviously higher than super 13Cr. Conclusion Super 13Cr could be applied to high CO2 level environment as tubing or casing. Super 13Cr was better than 13Cr in anti-corrosion and anti-pitting properties. |
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