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| Experimental Study on the Selection of Corrosion and Scale Inhibitors for Jinxian 1-1 Water Source Well |
| Received:October 16, 2020 Revised:November 20, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.01.014 |
| KeyWord:H2S corrosion corrosion under scale corrosion inhibitor scale inhibitor |
| Author | Institution |
| ZHAO Shun-chao |
Bohai Oil Research Institute, Tianjin Branch of CNOOC China Limited, Tianjin , China |
| QI Ya-dong |
Bohai Oil Research Institute, Tianjin Branch of CNOOC China Limited, Tianjin , China |
| CHEN Hua-xing |
Bohai Oil Research Institute, Tianjin Branch of CNOOC China Limited, Tianjin , China |
| WU Hua-xiao |
Bohai Oil Research Institute, Tianjin Branch of CNOOC China Limited, Tianjin , China |
| FANG Tao |
Bohai Oil Research Institute, Tianjin Branch of CNOOC China Limited, Tianjin , China |
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| Abstract: |
| To solve the problem of corrosion and scaling of downhole tubing in Jinxian 1-1 Oilfield. Combining the actual working conditions of the water source well in the Jinxian 1-1 Oilfield, a high temperature and high pressure dynamic corrosion tester was used to simulate the wellbore conditions to further understand the corrosion and scaling of the N80 steel in the H2S-containing water of the A1W well. The method of indoor experiment was used to choose the optimal single inhibitor among three corrosion inhibitors and five scale inhibitors respectively based on analyzing the micro-topography of the surface of specimens with the scanning electron microscope. Finally, carrying out compatibility experiments on the optimized corrosion inhibitors and scale inhibitors to clarify the compatibility after mixing to get the best ratio of corrosion inhibitors and scale inhibitors. The scale inhibition rate of the selected AA/AMPS can reach 84.2%, and the corrosion inhibition rate of the selected HS-3 can reach 87.3%. Compatibility experiment results show that HS-3 and AA/AMPS have better compatibility. When the ratio of corrosion inhibitor and scale inhibitor is 11:1, the corrosion inhibition rate can reach 87.7%, and the scale inhibition rate can reach 94%. The performance of the optimized composite corrosion and scale inhibitor can meet the corrosion and scale control index of oilfield. |
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