海上油田生产水管线的腐蚀原因

Corrosion Reason of Production Water Pipeline in Offshore Oilfield

渤海某海上油田生产水管道发生腐蚀穿孔,对穿孔原因进行分析。结果表明:该油田生产水中含有大量亚铁离子和碳酸氢根离子,在运行过程中产生碳酸亚铁垢,由于碳酸亚铁垢表面存在裂纹,进而发生严重的垢下腐蚀;现用的防垢剂并不能很好地抑制碳酸亚铁垢,现场应采用双相不锈钢替换碳钢,解决垢下腐蚀问题。

Corrosion perforation occurred in the production water pipeline of an offshore oilfield in Bohai Sea, and the cause of the perforation was analyzed. The results showed that the production water of this oilfield contained a large amount of ferrous ions and bicarbonate ions, and ferrous carbonate scale was produced during operation. Because of the cracks on the surface of the ferrous carbonate scale, serious corrosion under scale occurred. The anti-scaling agent currently in use could not well inhibit the scale of ferrous carbonate. Duplex stainless steel should be used to replace carbon steel on site to solve the problem of corrosion under scale.