| YANG Jin,SHI Shan-shan,YIN Qi-shuai,ZHENG Xun,LI Zhen-kun,ZHAO Shao-wei,YANG Yu-ming,WANG Jun-xiang.The Conductor Corrosion Law Research of Oil and Gas Wells in South China Sea[J],48(6):274-281 |
| The Conductor Corrosion Law Research of Oil and Gas Wells in South China Sea |
| Received:October 30, 2018 Revised:June 20, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.06.033 |
| KeyWord:South China Sea conductor corrosion rate general corrosion density of corrosion current condensance arc corrosion resistance |
| Author | Institution |
| YANG Jin |
1.China University of Petroleum, Beijing, Beijing , China |
| SHI Shan-shan |
1.China University of Petroleum, Beijing, Beijing , China |
| YIN Qi-shuai |
1.China University of Petroleum, Beijing, Beijing , China |
| ZHENG Xun |
2.CNOOC Ener Tech-Drilling & Production Co., Tianjin , China |
| LI Zhen-kun |
2.CNOOC Ener Tech-Drilling & Production Co., Tianjin , China |
| ZHAO Shao-wei |
3. Tianjin Branch, CNOOC China Limited, Tianjin , China |
| YANG Yu-ming |
1.China University of Petroleum, Beijing, Beijing , China |
| WANG Jun-xiang |
1.China University of Petroleum, Beijing, Beijing , China |
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| Abstract: |
| The work aims to systematically analyze the corrosion behavior and law of six different kinds of materials at four corrosion zones (atmospheric zone, splash zone, tide zone, and full immersion zone) and in three corrosion cycles (60 d, 90 d, and 180 d) so as to provide theoretical basis for the future material optimization of conductor in the South China Sea. Firstly, indoor immersion tests were carried out to simulate marine corrosion environment, and analyze the corrosion behavior of conductor at atmospheric zone, splash zone, tide zone and full immersion zone respectively by SEM scanning the corrosion coupons. Secondly, the corrosion rate of the six materials at four corrosion zones was studied and finally, the corrosion resistance of the six materials was investigated by potential polarization, and electrochemical impedance techniques. The corrosion forms of coupons were mainly general corrosion. The corrosion degree at the splash zone and the tide zone was more serious than that at the atmospheric zone and the full immersion zone, and the corrosion products of the splash zone, tide zone and full immersion zone were mainly γ-FeO(OH). After testing for 180 d, the corrosion rate at atmospheric zone was 0.0651~0.0976 mm/a, 0.3924~0.4857 mm/a at splash zone, 0.3070~0.3783 mm/a at tide zone, and 0.1714~0.2109 mm/a at full immersion zone. The size relationship of condensance arc of the six materials was X80< X70< X65< X60< X56< X52. From the polarization curves, the higher the degree of steel is, the greater the density of corrosion current and the faster the corrosion rate will be. Under the experimental conditions, the conductor corrosion forms of South China Sea are mainly corrosion and oxygen corrosion, and the conductor coupons of X52 material have a slower corrosion rate and are stronger on corrosion resistance than X80 material. |
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