ABSTRACT Air-assisted steam injection is used as a secondary or tertiary oil recovery technology. During closing, downhole tubular goods are subject to corrosion in a mixed oxygen–steam–hot solution environment. This study investigates the influence of air injection pressure, temperature and Cl− ion concentration in the injection water on the corrosion of P110 steel. Results show that high air injection pressure for increasing oil recovery ratio leads to the highly aggressive corrosion. The trend of corrosion rate and temperature in air-saturated injection water is a reversed ‘V’ curve. However, the high Cl− concentration, which promotes the formation of large holes in the magnetite scale, greatly reduces corrosion. A suitable injection press that balances the oil recovery ratio and corrosion rate of oil tube, avoiding 170°C suitable for the highest corrosion rate, and periodic removing corrosion scales are necessary to inhibit further deterioration of downhole tubular goods.

中文翻译：

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二次或三次采油的空气辅助蒸汽注入过程中的井下 O2 腐蚀

摘要 空气辅助蒸汽注入被用作二次或三次采油技术。在关闭过程中，井下管材在氧-蒸汽-热混合溶液环境中会受到腐蚀。本研究调查了空气注入压力、温度和注入水中的 Cl− 离子浓度对 P110 钢腐蚀的影响。结果表明，用于提高采油率的高空气注入压力导致高度侵蚀性腐蚀。空气饱和注入水中的腐蚀速率和温度趋势是一个反向的“V”曲线。然而，高浓度的 Cl− 会促进磁铁矿鳞片中大孔的形成，大大减少了腐蚀。一个合适的注塑机，可以平衡油管的采油率和腐蚀率，