| WANG Feng,WANG Li-xian,LIU Zhi-yong,AI Chi.Study on Stress Corrosion Behavior of TP110TS Oil Pipeline Steel in the Sour Gas Field Environment[J],44(3):57-62,73 |
| Study on Stress Corrosion Behavior of TP110TS Oil Pipeline Steel in the Sour Gas Field Environment |
| Received:November 02, 2014 Revised:March 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.03.010 |
| KeyWord:TP110TS sour gas field stress corrosion hydrogen permeation |
| Author | Institution |
| WANG Feng |
1. College of Petroleum Engineering, Northeast Petroleum University, Daqing , China;2. Songyuan Gas Production Plant, Jilin Oil Field Company of China Oil, Songyuan , China; |
| WANG Li-xian |
Beijing Sj Environmental Protection and New Material Co. , Ltd, Beijing , China |
| LIU Zhi-yong |
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| AI Chi |
College of Petroleum Engineering, Northeast Petroleum University, Daqing , China |
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| Abstract: |
| Objective To study the stress corrosion cracking (SCC) behavior of TP110TS oil pipeline steel in the simulated sour gas field environment. Methods Potentiodynamic polarization, electrochemical impedance method, electrochemical hydrogen charging, constant load test methods such as immersion test of constant-loading specimen and slow strain rate tensile test were used for research in the simulated sour gas field environment. Results It showed that the amount of hydrogen in the TP110TS oil pipeline steel in the sour gas field environment was substantially decreased when the temperature was 100 ℃ , the hydrogen embrittlement effect was diminished, which resulted in the decreased stress corrosion sensitivity as compared to that at 60 ℃ . In the sour gas field environment with a temperature of 100 ℃ , the TP110TS steel showed some stress corrosion sensitivity only when the tensile stress on the steel exceeded 70% σs. It showed that the stress level of the material in the process of actual use should be kept below 70% σs. However, when the temperature was reduced to 60 ℃ , its security stress threshold value should be decreased to 50% σs. Conclusion The SCC mechanism of TP110TS oil pipeline steel in the sour gas field environment was mixed-controlled by both anodic dissolution (AD) and hydrogen-induced (HE), and the existence of the tensile stress shortened the corrosion life of the TP110TS steel and the greater the tensile stress was, the shorter the corrosion life became. |
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