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| Corrosion Performance of High Strength 15Cr Martensitic Stainless Steel in Severe Environments |
| Xiang-hong L�J1,Fu-xiang ZHANG2,Xiang-tong YANG2,Jun-feng XIE2,Guo-xian ZHAO1,Yan XUE3 |
1. School of Materials Science and Engineering, Xi��an Shiyou University, Xi��an 710065, Shaanxi, China
2. Petroleum Engineering Institute, Petrochina Tarim Oilfield Company, Kuerle 841000, Xinjiang, China
3. Xi��an Maurer Petroleum Engineering Laboratory, Co., Ltd., Xi��an 710065, Shaanxi, China |
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Abstract High pressure and high temperature corrosion performance of high strength 15Cr martensitic stainless steel was studied in different severe environments��live acid (10%HCl+1.5%HF+3%HAc+5.1% corrosion inhibitor), spent acid and formation water containing CO2. The results show that the corrosion of high strength 15Cr martensitic stainless steel in live acid is most serious, and the uniform corrosion rate is far greater than those in spent acid and formation water containing CO2 corrosion environments, but all of them can be acceptable for oilfield. Acidizing corrosion inhibitor displays a good matching ability with the high strength 15Cr martensitic stainless steel in terms of decreasing the uniform corrosion rate, which changes mainly the anodic process of high strength 15Cr martensitic stainless steel. The corrosion potential moves to the positive direction, thus the corrosion current density decreases significantly. There are some different degrees of pitting of high strength 15Cr martensitic stainless steel after corrosion tests in live acid, spent acid and formation water containing CO2, and the pitting density aggravates significantly and the maximum pit depth decreases in the corrosion sequence.
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Received: 02 July 2013
Published: 01 August 2014
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| Fund:Project guided by science and technology in Inner Mongolia Autonomous Region |
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Corresponding Authors:
Zhao
E-mail: zhaomf-tlm@petrochina.com
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2014, Vol. 21 
