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| Optimization Design of Impressed Current Cathodic Protection for Offshore Oil Jacket Platform I:Single Seat Auxiliary Anode |
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| DOI：10.7643/issn.1672-9242.2022.12.013 |
| KeyWord:marine corrosion jacket platform cathodic protection physical scale model optimization design ICCP |
| Author | Institution |
| ZHANG Wei |
Shanghai Haikai Anti-corrosion Engineering Technology Branch of CNOOC Changzhou Paint and Coatings Industry Research Institute Co., Ltd., Guangdong Zhanjiang , China |
| ZHANG Yuan-sheng |
Southern Marine Science and Engineering Guangdong Laboratory Zhuhai, Guangdong Zhuhai , China |
| HAN Bing |
Qingdao NCS Testing and Protection Technology Co.Ltd., Shandong Qingdao , China |
| JIN Xi |
CNOOC Changzhou Paint and Coatings Industry Research Institute Co., Ltd.Jiangsu, Changzhou , China |
| ZHUANG Ze-jing |
Qingdao NCS Testing and Protection Technology Co.Ltd., Shandong Qingdao , China |
| ZHAN Hui |
Qingdao NCS Testing and Protection Technology Co.Ltd., Shandong Qingdao , China |
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| Abstract: |
| The work aims to study the cathodic protection potential distribution and change law of jacket with impressed current and single seat auxiliary anode under static and dynamic seawater conditions by taking an offshore jacket platform in the South China Sea as the prototype. A jacket model with a certain scale reduction was adopted and impressed current cathodic protection was applied. The cathodic protection potential distribution under different conditions and the change law of potential distribution were studied. The farther the auxiliary anode was from the jacket model, the more uniform the cathodic protection of the whole model was, otherwise, the more uneven it was. The area closest to the auxiliary anode outside the jacket was prone to over-protection risk due to the high protection current density. However, the negative shift of cathodic protection potential was the least in the severely shielded area inside the platform and the jacket structure near the water surface farthest from the auxiliary anode, which was prone to the under-protection risk. These two typical areas were the key locations for cathodic protection monitoring. Under the same protection current density and protection distance, the potential of the whole jacket surface presented an upward trend during the transition from static state to dynamic state, and the potential difference was larger and the distribution was more uneven. With the extension of cathodic protection time, the surface resistivity Rsr representing the formation quality and coverage degree of the sedimentary layer increased rapidly in the initial stage and slowly in the later stage. Seawater flow could lead to thinning and even shedding of sediments, so Rsr in dynamic seawater environment was smaller than that in static environment at the same time. Placing an auxiliary anode on one side of the jacket model can realize the effective cathodic protection of the whole model. |
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