高温高压h2sco2环境缓蚀剂的研究-study on environmental corrosion inhibitor h2sco 2 under high temperature and pressure.docx

摘 要高含硫、酸性气田井下的腐蚀环境十分苛刻，国内外对此类油气田的开发经验 尚不丰富，一般通过采用高镍基合金钢来进行防腐。但是高合金钢价格高昂，大大提 高了油气田的开发成本。而高温缓蚀剂加碳素钢是一种有效、价廉的防腐手段，能否 开发出在高温高酸性气田井下有高效作用的缓蚀剂对我国高温高酸性气田的开发至 关重要。本文针对高温高压 H2S/CO2 及高矿化度的恶劣腐蚀环境，合成多种缓蚀剂主体， 并设计多种不同 H2S/CO2 腐蚀环境，对曼尼希碱、咪唑啉、吡啶和喹啉季铵盐等多种 缓蚀剂主体及其相关配体进行筛选评价，得到以喹啉季铵盐为主体复配缓蚀剂 GWS-5。通过高温高压 H2S/CO2 动态腐蚀失重评价其缓蚀效果，硫化氢应力腐蚀试验 (SSC)测试其抗硫化氢应力腐蚀开裂性能，并利用扫描电镜(SEM)、X 光电子能谱(XPS) 等分析方法研究了 GWS-5 缓蚀剂的缓蚀机理。主要研究结果如下：本课题研制的 GWS 系列缓蚀剂对碳素钢在高温高压 H2S/CO2 条件下具有优良的 缓蚀性能，其中以 GWS-5 喹啉季铵盐型缓蚀剂效果最佳。在金属表面形成吸附膜与 腐蚀产物共同阻滞腐蚀介质的传递，抑制点蚀的发生，降低腐蚀速率。当 T=150℃、 PH2S=1.5Mpa、PCO2=1.5Mpa、转速为 300r/min 时，在 GWS-5 用量为 0.15%的情况下， 缓蚀效率可达 97%，且 GWS-5 对 N80 钢具有良好的抑制硫化氢应力腐蚀的作用。关键词：高温高压 H2S/CO2 缓蚀剂 喹啉季铵盐 吡啶季铵盐 SEM/XPS SSCAbstractThe environment of gas well down hole in high sulfur and high temperature system (the partial pressures of H2S and CO2 are more than 1.5Mpa) is very harsh. But the related oil filed exploitation experience is not rich both at home and abroad. High-alloy steel is generally used greatly in this environment, but the cost of high-alloy steel is too high to be used in oil filed the combination of inhibitor and carbon steel is an effective and low-cost way, so it is very important to develop one effective inhibitor for exploiting the oil in the environment of high sulfur and high temperature.For the harsh corrosive environment of gas well system (the partial pressures of H2S and CO2 are more than 1.5Mpa) in high sulfur and high temperature gas filed. Many inhibitor bodies were synthesized and evaluated by weight-loss method in the different corrosion conditions of H2S/CO2 including pyridines quaternary ammonium salt, quinolines quaternary ammonium salt, mannich bases and imidazolines quaternary ammonium salt and so on. Quinolines quaternary ammonium salt inhibitor GWS-5 were gained and evaluated in the environment of high temperature and high pressure H2S/ CO2 environment by dynamic weight losing method and constant strain SSC test. Corrosion inhibition mechanism of inhibitor GWS-5 for N80 was discussed