摘要
超稠油开发难点在于地下大幅度降低原油黏度,催化氧化改质具有应用潜力,但需要找到兼具活性与注入能力的催化剂,研究其反应机理.通过微乳液法制备并表征了纳米过渡金属催化剂,用以辅助超稠油注空气氧化改质吞吐的对比实验,结果表明氧化改质能够大幅度降低超稠油黏度,降黏率最高达99.86%,纳米金属催化下的改质温度降至240℃,改质速率与产油效果均显著优于微米级粉末催化剂,实验推测了氧化改质反应在不同温度下的四步机理,包括杂元素断链、初步氧化、深度氧化与高温脱羧.与加氢还原改质超稠油相比,纳米催化氧化改质更具有降黏效果好、成本低、易实施的特点,具有一定的工业应用潜力.
The key difficult in the development of super heavy oil is to reduce oil viscosity in reservoir. Although catalyst assisted oxidization upgrading is proved in its potential application, more works shall be done in catalyst and mechanism research. In this study, nano transition metal catalyst is prepared and characterized by micro-emulsion method to assist air oxidization upgrading huff and puff contrast experiment. The result shows that oxidization upgrading could reduce viscosity of super heavy oil significantly by 99.86% and reduce reaction temperature to 240℃, reaction rate and oil production are also much better than that assisted by powder shape catalyst. In the experiment, 4 step mechanisms were proposed including chain broking, first step oxidation, second step oxidation and decarboxylation. Compared with hydrogenation upgrading, nano catalyst assisted oxidization upgrading has better viscosity reduction rate, lower cost and easier application characteristics.
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2017年第2期197-203,共7页
Scientia Sinica(Technologica)
关键词
超稠油
稠油改质
氧化
纳米催化剂
降黏
super heavy oil, upgrading, oxidization, nano catalyst, viscosity reduction
