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| Evaluation of Applicability of Five Cr-containing Steels at High Temperature and High Carbon Dioxide |
| Received:September 27, 2020 Revised:October 10, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.11.009 |
| KeyWord:CO2 corrosion Cr-containing steel corrosion rate local corrosion evaluation of applicability material optimization |
| Author | Institution |
| GAO Bo |
CNPC Chuanqing Drilling Engineering Co.Ltd., Guanghan , China |
| ZHONG Yang |
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu , China |
| ZHAO Ge |
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu , China |
| CHENG Di-kui |
Sichuan Xinchuangneng Petroleum Engineering Technology Co.Ltd., Guangyuan , China |
| TONG Hang |
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu , China;Exploration and Development Technology Research Institute, Yanchang Oilfield Co.Ltd., Yan’an , China |
| ZENG De-zhi |
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu , China |
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| Abstract: |
| The work aims to predict the corrosion of the string in the high temperature and high carbon dioxide oil well and recommend safe and economical materials for the well. The actual working conditions were simulated by a high-temperature and high-pressure autoclave. The applicability of five kinds of Cr-containing steels was evaluated by weight loss method, scanning electron microscope (SEM) and X-ray energy spectrum analysis (EDS). Within 40-160 ℃, the uniform corrosion rate of five kinds of steel first increased and then decreased with the increase of temperature, and all reached the maximum at 80℃. The corrosion rate of 3Cr steel was the highest and was far higher than 0.076 mm/a in the whole temperature range. At 120 ℃, local corrosion of 9Cr occurred. 13Cr steel had a tendency to corrode locally at 160 ℃. The corrosion rate of S13Cr and 22Cr steel was low in the whole temperature range. After the test, the surface of the samples was smooth and continuous with good corrosion resistance. It is suggested to use 9Cr steel in the upper section of low temperature (40 ℃~80 ℃), use 13Cr steel in the middle section of mid-high temperature (80 ℃~120 ℃) and use S13Cr steel at the bottom of high temperature (120 ℃~160 ℃). |
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