腐蚀速率的控制是采油污水回注水质控制的重要指标之一。本工作应用静态分析法分析了双河联合站回注水系统的腐蚀因素,探讨了无机离子种类、离子交互作用、溶解氧、pH、温度变化对腐蚀速率的影响。结果表明,单位浓度阳离子腐蚀速率的顺序为Na＋〈Ca2＋〈Mg2＋〈Fe2＋〈Fe3＋;单位浓度阴离子腐蚀速率的顺序为SO42-〈HCO3—〈S2-;模拟水中溶解氧浓度增大、pH降低,腐蚀速率升高;在考虑溶解氧、pH、温度等条件下,对腐蚀速率影响较大的因素是Fe3＋及S2-。通过防腐蚀措施的实施,使平均腐蚀速率由原来的0.1262mm/a降低到0.055mm/a以下。
Corrosion control is important to the purified produced-water as injection-water.The corrosion factors of injection water system were analyzed in Shuanghe oil treatment station with the static analysis method.The effects of inorganic ions,ion interaction,dissolved oxygen,pH and temperature of wastewater on corrosion rate were discussed.The results showed that the corrosion rate order per unit cationic ions was Na＋Ca2＋Mg2＋Fe2＋Fe3＋;that per unit anion ion was SO42-HCO3—S2-.The corrosion rate increased with increasing the dissolved oxygen concentration.The major influence factors of corrosion rate were Fe3＋and S2-under the conditions considering dissolved oxygen,pH and temperature to produced-water.The average corrosion rate decreased from 0.1262 mm/a to 0.055 mm/a after anti-corrosion measures were implemented.
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