超细金属催化剂改善稠油火烧效果实验研究

摘要/Abstract

摘要：

为了明确超细过渡金属催化剂对稠油火烧效果的影响,应用热分析及等转化率方法对NiO、α·Fe₂O₃和Co₃O₄三种超细过渡金属粒子进行火烧氧化动力学评价,并应用优选出的催化剂开展一维火驱实验。实验结果表明,在Co₃O₄存在的条件下,稠油活化能降低幅度最大,达41.7 %,且Co₃O₄催化活性较高,适合作为火驱实验的催化剂。与纯火驱相比,Co₃O₄催化条件下原油的高温氧化反应得到强化,氧气利用率提高6.79 %,燃烧时间缩短11.8 %,燃烧前缘平均温度提高20 ℃,燃烧前缘最大温度差降低4 ℃,燃烧更加稳定,且前缘推进速度加快了0.042 cm/min,最终驱油效率提高5.7 %,产出油降黏率提高7.2 %。研究成果对拓展火烧油层开采稠油的应用具有重要的指导意义。

关键词: 稠油, 火烧油层, 超细粒子, 金属氧化物, 催化

Abstract:

In order to identify the effect of ultra-fine transition metal catalyst on the in-situ combustion of heavy oil, thermal analysis and isoconversional method were used to evaluate the burning oxidation kinetics of three ultra-fine transition metal particles—NiO, α·Fe₂O₃ and Co₃O₄. And then, one-dimensional in-situ combustion experiment was carried out by the optimized catalyst. The experimental results showed that, in the presence of Co₃O₄, the activation energy of heavy oil decreased the most, up to 41.7 %. Meanwhile, Co₃O₄ had higher catalytic activity, that made it suitable for in-situ combustion experiment. Compared to conventional in-situ combustion, high temperature oxidation reaction of crude oil was enhanced under the catalytic condition of Co₃O₄. The oxygen utilization ratio increased by 6.79 %, the combustion time shortened by 11.8 %, the average temperature of the leading edge of combustion increased by 20 ℃, the maximum temperature difference of the leading edge of combustion reduced by 4 ℃, the combustion was more stable, the advance speed of the leading edge increased by 0.042 cm/min, the final oil displacement efficiency increased by 5.7 %, and the viscosity reduction rate of the produced oil increased by 7.2 %. The research results have important guiding significance for expanding the application of heavy oil recovery by in-situ combustion.

Key words: heavy oil, in-situ combustion, ultra-fine particle, metal oxides, catalyze

中图分类号:

TE345

张弦,车洪昌,刘以胜,陈鑫. 超细金属催化剂改善稠油火烧效果实验研究[J]. 油气藏评价与开发, 2019, 9(4): 36-40.

ZHANG Xian,CHE Hongchang,LIU Yisheng,CHEN Xin. Improved efficiency of in-situ combustion by application of submicro metal oxides particles[J]. Reservoir Evaluation and Development, 2019, 9(4): 36-40.

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类别	粒径/nm	BET表面积/（m²·g^-1）
NiO	80~130	105
α·Fe₂O₃	100~250	43
Co₃O₄	200~500	41

样品	活化能/kJ	50 %转化率,f
稠油	134.34	0.005（390 ℃）
稠油+NiO	90.74	0.079（330 ℃）
稠油+α·Fe₂O₃	106.52	0.092（330 ℃）
稠油+Co₃O₄	78.38	0.026（330 ℃）