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| Effect of Oilfield Chemical Additives on Corrosion Behavior of Sewage Treatment System |
| Received:August 03, 2020 Revised:August 07, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.11.006 |
| KeyWord:sewage corrosion corrosion inhibitor suspended sludge filtration oilfield chemistry inhibition |
| Author | Institution |
| LI Ling-jie |
CNPC Engineering Technology Research Company Limited, Tianjin , China;Research Division of Anti-Corrosion Coating and Thermal Insulation Structure, CNPC Key Laboratory of Tubular Goods Engineering, Tianjin , China |
| SU Bi-huang |
CNPC Engineering Technology Research Company Limited, Tianjin , China;Research Division of Anti-Corrosion Coating and Thermal Insulation Structure, CNPC Key Laboratory of Tubular Goods Engineering, Tianjin , China |
| HUANG Gui-bai |
CNPC Engineering Technology Research Company Limited, Tianjin , China;Research Division of Anti-Corrosion Coating and Thermal Insulation Structure, CNPC Key Laboratory of Tubular Goods Engineering, Tianjin , China |
| ZHANG Yan-jun |
CNPC Engineering Technology Research Company Limited, Tianjin , China;Research Division of Anti-Corrosion Coating and Thermal Insulation Structure, CNPC Key Laboratory of Tubular Goods Engineering, Tianjin , China |
| WANG Zhi-tao |
CNPC Engineering Technology Research Company Limited, Tianjin , China;Research Division of Anti-Corrosion Coating and Thermal Insulation Structure, CNPC Key Laboratory of Tubular Goods Engineering, Tianjin , China |
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| Abstract: |
| The work aims to study the effect of water purifying agent, flocculant, coagulant aid and corrosion inhibitor on the corrosion behavior of sewage treatment system. Process flow analysis, corrosion appearance observation, corrosion product composition analysis and corrosion weight loss test were conducted to analyze the causes of corrosion in the sewage treatment system and investigate the influences of oilfield chemical additives on the corrosion behavior of SSF sewage treatment system. The results showed that the corrosion in SSF purification unit was caused by dissolved oxygen, carbon dioxide, high concentration chloride ions in the produced water. The dynamic corrosion rate decreased from 1.8544 mm/a to 0.6674 mm/a, 0.8627 mm/a, 0.3530 mm/a and the static corrosion rate decreased from 1.2515 mm/a to 0.9565 mm/a, 0.9474mm/a and 0.6256 mm/a after adding water purifying agent, flocculant and coagulant aid with concentration of 150mg/L, 0.3mg/L and 60mg/L respectively. After adding 160 mg/L corrosion inhibitor, the dynamic corrosion rate decreased from 1.8544 mm/a to 0.0822 mm/a, and the static corrosion rate decreased from 1.2515 mm/a to 0.0238 mm/a. The dynamic corrosion rate was 0.7672 mm/a and the static corrosion rate was 0.8742 mm/a after adding water purifying agent, flocculant and coagulant aid at the same time. But the dynamic corrosion rate was 0.3069 mm/a and the static corrosion rate was 0.0263 mm/a after adding water purifying agent, flocculant, coagulant aid and inhibitors at the same time. Adding corrosion inhibitor can effectively control the corrosion in SSF sewage treatment system. Water purifying agent, flocculating agent and coagulant aid can inhibit the corrosion to some extent. Under the dynamic condition, water purifying agent, flocculating agent and coagulant aid reduce the inhibition effect of the inhibitor, but under the static condition, the three additives have little effect on the inhibition effect. |
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