陕北高含硫采油污水腐蚀特性研究

发布时间：2018-04-20 19:11

本文选题：高含硫水 + J钢　；参考：《腐蚀科学与防护技术》2017年01期

【摘要】：以陕北某作业区高含硫采出水水质组成为参照,配置模拟高含硫采油污水,研究其对J55管材的腐蚀特性。通过改变H2S压力、p H值、溶解氧、不同离子浓度,考察了各因素对J55管材腐蚀速率的影响,并通过扫描电镜与能谱分析研究了腐蚀挂片的形貌与元素组成的差异。结果表明:在H2S压力小于0.30 MPa的实验范围内,J55钢的腐蚀速率随着H2S压力的增大而增大;溶解氧是造成高含硫采油污水腐蚀的主要影响之一;p H值在7.0~7.5之间存在一个突变点,当p H值小于这个突变点时,J55钢在含H2S溶液中的腐蚀速率随p H值降低而显著增加;当p H7.5时,腐蚀速率变化幅度不明显且腐蚀速率均小于0.05 mm/a;在现场污水p H值变化范围(6.0~8.5)内的高含硫水中,无论偏酸抑或偏碱性,SO42-对高含硫污水中J55的腐蚀基本没有影响,CO32-、HCO3-的加入会增加其腐蚀性,酸性条件下加入S2-腐蚀速率明显增大,偏碱性加入S2-对腐蚀基本没有影响。
[Abstract]:The corrosion characteristics of J55 pipe were studied by using simulated high sulfur oil recovery wastewater as reference to the water quality composition of high sulfur produced water in a certain operating area in northern Shaanxi. The influence of various factors on the corrosion rate of J55 pipes was investigated by changing H _ 2S pressure, dissolved oxygen and different ion concentrations. The morphology and element composition of the corrosion hangers were studied by SEM and EDS. The results show that the corrosion rate of J55 steel increases with the increase of H _ 2S pressure in the range of H _ 2S pressure less than 0.30 MPa. When pH value is less than this point, the corrosion rate of J55 steel in H2S solution increases significantly with the decrease of pH value, and when pH 7.5, the corrosion rate of J55 steel increases with the decrease of pH value. The range of corrosion rate is not obvious and the corrosion rate is less than 0.05 mm / a. The corrosion of J55 in high sulfur-containing wastewater was not affected by the addition of acid or alkaline so _ 42-, and the corrosion rate was increased by adding CO _ (32) -H _ (CO _ 3-), and the corrosion rate was obviously increased by adding S _ (2-) in acidic condition, but the corrosion was not affected by adding S _ (2 -) to alkalinity.
【作者单位】：西安石油大学化学化工学院;陕西省油气田环境污染控制技术与储层保护重点实验室;中国石油集团测井有限公司;
【基金】：国家自然科学基金(51504193)~~
【分类号】：TE980

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