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| Corrosion Inhibition Behavior of Oleic Acid Imidazoline on Carbon Steel in CO2 Enhanced Oil Recovery Process |
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| DOI：10.7643/issn.1672-9242.2023.06.016 |
| KeyWord:inhibitor CO2 enhanced oil recovery oleic acid imidazoline excess surface charge adsorption corrosion |
| Author | Institution |
| LIAN Yu-bo |
Xi'an Changqing Chemical Group Co.Ltd., Xi'an , China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Oil and Gas Technology Research Institute of Changqing Oil Field, Xi'an, , China |
| WENG Hua-tao |
Xi'an Changqing Chemical Group Co.Ltd., Xi'an , China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Oil and Gas Technology Research Institute of Changqing Oil Field, Xi'an, , China |
| GUO Gang |
Xi'an Changqing Chemical Group Co.Ltd., Xi'an , China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Oil and Gas Technology Research Institute of Changqing Oil Field, Xi'an, , China |
| HUANG Chen |
Xi'an Changqing Chemical Group Co.Ltd., Xi'an , China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Oil and Gas Technology Research Institute of Changqing Oil Field, Xi'an, , China |
| WEI Ya-jun |
Xi'an Changqing Chemical Group Co.Ltd., Xi'an , China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Oil and Gas Technology Research Institute of Changqing Oil Field, Xi'an, , China |
| JIANG Wei |
Xi'an Changqing Chemical Group Co.Ltd., Xi'an , China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Oil and Gas Technology Research Institute of Changqing Oil Field, Xi'an, , China |
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| Abstract: |
| The work aims to study the corrosion inhibition mechanism and law of imidazoline inhibitor on oil casing steel in CO2 enhanced oil recovery process. The environment for CO2 enhanced oil recovery process in Changqing Oil Field was simulated as the experimental condition. The corrosion inhibition behavior of oleic acid imidazoline on P110 carbon steel was studied via weight-loss measurements, electrochemical tests and surface characterizations. The corrosion rate of P110 steel increased with the increase of CO2 partial pressure, but the increase range was not obvious. When the partial pressure of CO2 was 2 and 6 MPa, oleic acid imidazoline had a significant inhibition effect on the corrosion of P110 steel, the corrosion inhibition efficiency was more than 98%, and the surface of the specimen was basically complete. When the CO2 partial pressure increased to 8 MPa, the corrosion inhibition performance of oleic acid imidazoline decreased obviously, and the corrosion inhibition efficiency was only 64.33%. There were obvious corrosion traces on the surface of the specimen. When the CO2 partial pressure increases to 8 MPa, the P110 steel surface carries excess positive charge, which is not conducive to the adsorption of oleic acid imidazoline inhibitor. |
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