超细金属催化剂改善稠油火烧效果实验研究

Abstract

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

CLC Number:

TE345

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.

Figures/Tables 10

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References 22

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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 ℃）

Improved efficiency of in-situ combustion by application of submicro metal oxides particles

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