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首页> 外文期刊>Journal of CO2 Utilization >Numerical investigations of key aspects influencing CO2 foam performance in fractured carbonate system using CO2 soluble surfactants
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Numerical investigations of key aspects influencing CO2 foam performance in fractured carbonate system using CO2 soluble surfactants

机译：CO2可溶性表面活性剂对裂缝碳酸二氧化碳泡沫性能影响CO2泡沫性能的关键方面的数值研究

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Experimental studies have showed that CO2 soluble surfactants were more effective than aqueous soluble surfactant as supercritical CO2 foaming agent in fractured carbonate cores, in terms of higher foam strengths and oil recoveries. This paper aims to reveal the potential causes responsible to those superiorities and probe the impacts of key aspects during this complex process. Variable surfactants are examined to investigate the presence of optimal partition coefficient. The impact of surfactant structure on critical foaming concentration is also studied. Effect of reservoir pressure is investigated through stepwise independent manipulations attempting to decouple its influences on miscibility between CO2/oil, free gas phase availability and surfactant partition coefficient between CO2/brine. Effect of injection foam quality (gas volumetric fraction) is probed at constant liquid injection rate. It is found that the optimal partition coefficient for selected system is affected by multiple practical conditions including injection periods and surfactant structure relevant model parameters, but not determined by absolute coefficient values. The results of increasing system pressure and injection foam quality are combination of multiple aspects, including miscibility between CO2/Oil, local pressure drop, foam apparent viscosity, among of CO2 injection, gaseous CO2 available for surfactant delivery, and interplay between faster surfactant propagation and reduced local pressure gradient ("spreading" effect). The contribution of promoted or suppressed spreading effect could depend on magnitude of individual partition coefficient. The findings here reveal the complex interactions of multiple key aspects affecting CO2 soluble surfactant foams performance and promote the understandings to apply this novel technology in fractured systems.
机译：实验研究表明，在较高泡沫强度和油回收方面，CO 2可溶性表面活性剂在裂缝碳酸核酸核中作为超临界CO2发泡剂的水溶性表面活性剂更有效。本文旨在揭示负责这些优越性的潜在原因，并探讨关键方面在这种复杂过程中的影响。检查可变表面活性剂以研究最佳分配系数的存在。还研究了表面活性剂结构对临界发泡浓度的影响。通过逐步独立的操作研究了储层压力的影响，试图将其对CO 2 /盐水之间的CO 2 /油，自由气相可用性和表面活性剂分配系数之间的混溶性分离。注射泡沫质量（气体体积分数）的效果在恒定的液体注入速率下探测。结果发现，所选系统的最佳分区系数受多个实际条件的影响，包括注射周期和表面活性剂结构相关的模型参数，但不是由绝对系数值确定的。增加系统压力和注射泡沫质量的结果是多个方面的组合，包括CO 2 /油，局部压降，泡沫表观粘度之间的混溶性，CO 2注射中的泡沫表观粘度，可用于表面活性剂递送的气态CO 2，并且在更快的表面活性剂繁殖之间相互作用和相互作用减少局部压力梯度（“扩散”效果）。促进或抑制扩散效果的贡献可能取决于单个分区系数的大小。此处的研究结果揭示了影响CO 2可溶性表面活性剂泡沫性能的多个关键方面的复杂相互作用，并促进在裂缝系统中应用这种新技术的理解。

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