Comparative investigation of the static and dynamic properties of CO2 foam and N2 foam

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• 作者：Mingming Lv ; Shuzhong Wang ; Zhende Zhai ; Xiangrong Luo and Zefeng Jing
• 刊名：The Canadian Journal of Chemical Engineering
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：94
• 期：7
• 页码：1313-1321
• 全文大小：1269K
• ISSN：1939-019X

文摘

Foam flood using CO₂ can both enhance oil recovery and achieve geological storage of CO₂, which has attracted increasing attention in the last two decades. This work systematically investigates the behaviours of CO₂ and N₂ foams both in bulk and porous media by static foam tests and core flood experiments. The stability and foamability of CO₂ and N₂ foams were compared in static foam tests. The foam texture showed that CO₂ foam bubbles were relatively larger and exhibited a wider size distribution than N₂ foam bubbles, which was detrimental to foam stability. Furthermore, steady-state foam flows of CO₂ and N₂ foams at a fixed liquid flow rates were comparatively investigated with a foam quality range of 30–98 %. The difference between CO₂ foam stability and N₂ foam stability in porous media was relatively smaller, compared with the difference in bulk. Additionally, the analysis of foam rheology showed that foam exhibited different non-Newtonian flow characteristics at different foam qualities, and the resistance to shearing of CO₂ foam was lower than that of N₂ foam. Finally, the results of foam flood experiments demonstrated that the oil recoveries of CO₂ foam were lower than those of N₂ foam with a co-injection strategy under both subcritical and supercritical conditions. Compared with results in the atmosphere environment, the oil recovery of CO₂ foam flood was higher under supercritical conditions.