采用组分含量测试、化学成分分析、X射线衍射分析、热重-质谱分析、红外光谱分析、气相色谱-质谱分析和硫酸盐还原菌检测等方法对某注水海管腐蚀的原因进行分析。结果表明:该注水海管中的有机组分主要以烃类为主,同时含有脂类、胺类、醇类、烯烃类等物质,无机组分主要为铁的氧化物、碳酸亚铁和砂石;管道中含有大量的硫酸盐还原菌,在硫酸盐还原菌的协助下,发生了垢下腐蚀,最终导致该注水海管发生腐蚀。

The corrosion cause of a water injection pipeline was analyzed using methods such as component content testing, chemical composition analysis, X-ray diffraction analysis, thermogravimetric-mass spectrometry analysis, infrared spectroscopy analysis, gas chromatography-mass spectrometry analysis and sulfate reducing bacteria detection. The results show that the organic components in the water injection pipeline were mainly hydrocarbons, while contained substances such as lipids, amines, alcohols and olefins. The inorganic components were mainly iron oxides, ferrous carbonate and sand. The pipeline contained a large amount of sulfate reducing bacteria. With the assistance of sulfate reducing bacteria, corrosion under scale occurred, ultimately led to corrosion of the water injection pipeline.