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| Study on Corrosion Resistance of 1Cr-L80 Wellbore Pipe by Simulating Injection of Oxygen Reducing Air in Service Well |
| Received:September 29, 2020 Revised:December 22, 2020 |
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| DOI：10.7643/issn.1672-9242.2021.01.007 |
| KeyWord:wellbore corrosion dynamic corrosion gas injection well development oxygen-reducing air corrosion rate |
| Author | Institution |
| ZHOU Ding-zhao |
CNOOC Research Institute, Beijing , China |
| GU Lin |
CNOOC Research Institute, Beijing , China |
| HE Song |
CNOOC Research Institute, Beijing , China |
| XING Xi-jin |
CNOOC Research Institute, Beijing , China |
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| Abstract: |
| To determine the impact of injection of oxygen reducing air in development well on the whole life cycle of wellbore and corrosion rate of pipes based on the investigation of the wellbore corrosion in similar oil and gas fields on land and around the Bohai Sea. Experiment and research on the dynamic corrosion of gas injection well under different oxygen contents are carried out systematically, the dynamic corrosion of production well is evaluated, and the corrosion behavior of oxygen reducing air to oil well pipe is deeply analyzed, so as to analyze the pipe column corrosion characteristics, influence factors of corrosion rate and pipe colum corrosion risk under the working condition of injection of oxygen reducing air. The corrosion relation curves of 1Cr-L80 pipe under different oxygen concentrations and working conditions at well head, in middle and at bottom of the gas injection well was obtained through the experiment. The corrosion rates of 1Cr-L80 at well head, in middle and at bottom of the gas injection well with 5% oxygen content are 0.345 mm/a, 0.2147 mm/a and 0.1158 mm/a respectively; and those of gas injection well with 21% oxygen content are 0.7399 mm/a, 1.2854 mm/a and 2.4506 mm/a respectively. The experimental results show that the corrosion rate of 1Cr-L80 material is kept at a high level, and direct injection of air to old wells will lead to high corrosion risk. |
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