适用高温、高Cl-工况下的缓蚀剂合成及评价*

Synthesis and Evaluation of Corrosion Inhibitors under High Temperature and High Cl- Conditions

赵海洋 石 鑫 刘冬梅 魏晓静 高秋英

ZHAO Haiyang，SHI Xin，LIU Dongmei，WEI Xiaojing，GAO Qiuying

为了满足我国西北油田高温、高矿化度的恶劣开采条件，本文合成了一种喹啉季铵盐缓蚀剂QA，利用红外光谱对合成的样品进行了分析，然后通过高温高压动态反应釜实验考察了缓蚀剂在高温和高Cl-工况下的缓蚀效果，并利用分子动力学模拟实验研究了所合成缓蚀剂的缓蚀机理。研究表明：喹啉季铵盐QA在140℃、Cl-浓度为30000 mg/L环境中对N80和P110钢的缓蚀效率在92 %以上，是一种缓蚀效果良好的缓蚀剂。此外，分子动力学模拟实验结果表明，缓蚀剂QA能够取代金属表面的Cl-，减少金属与Cl-接触，延缓Cl-在金属表面的腐蚀反应；同时缓蚀剂QA的存在使Cl-在金属表面的吸附能降低，从而延缓了Cl-对金属的腐蚀，起到缓蚀效果。图5表1 参16

In order to meet the harsh mining conditions of high temperature and high salinity in Northwest China oilfield，a quinoline quaternary ammonium salt corrosion inhibitor QA was synthesized. The structure of the synthesized samples were analyzed by infrared spectroscopy，the corrosion inhibition effect of the corrosion inhibitor QA under high temperature and high Cl- concentration condition was evaluated by high temperature and high pressure dynamic reactor experiment. In addition，the corrosion inhibition mechanism of QA was probed by the molecular dynamics simulations experiments. The results showed that the inhibition efficiency of quinoline quaternary ammonium salt QA on N80 and P110 steels was above 92% at 140°C and Cl- concentration of 30， 000 mg/L，exhibiting good corrosion inhibition effect. In addition，molecular dynamics simulations showed that the corrosion inhibitor could replace the Cl- on the metal surface，reduce the contact between the metal and Cl-，and delay the corrosion reaction of Cl- on the metal surface. At the same time，the presence of the corrosion inhibitor QA could reduce the adsorption energy of Clon the metal surface，so it could delay the Cl- corrosion effect on metal corrosion，as a result，the QA played a higher inhibition effect.

10.19346/j.cnki.1000-4092.2020.01.027