威远气田混输管道腐蚀机理及影响因素

Corrosion mechanism of gas-water mixed pipeline and its affecting factors

摘要: 对威远气田气水混输管道的现场腐蚀产物进行化学分析，结果表明：取自现场腐蚀管段的腐蚀产物主要为FeS和FeS₂，以及腐蚀管段在大气中放置期间FeS生成的氢氧化亚铁Fe（OH）₂和氧化铁Fe₂O₃。通过室内模拟实验研究，验证了该管道腐蚀以H₂S腐蚀为主。研究了地层采出水的温度、所含离子类型、H₂S含量、矿化度及pH值等因素对管道腐蚀的影响规律，得出温度对管道腐蚀的影响最大。

Abstract: Corrosion product in the gas-water mixed pipeline in Weiyuan Gasfield is tested. Results show that the corrosion product is mainly FeS and FeS₂, and the Fe(OH)₂ and Fe₂O₃ generated from FeS when the corroded pipe section is exposed to air. Laboratory simulation test confirms that the corrosion is primarily caused by H₂S. The effects of such factors as temperature of formation water, ion type, content of H₂S, salinity and pH value, etc. on pipeline corrosion are investigated. It is concluded that temperature has the most significant effect on corrosion.