无油相多孔介质中发泡剂性能对泡沫驱油影响的实验研究与数值模拟

S. M. Hosseini-Nasab, M. Simjoo
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引用次数: 1

摘要

研究了多孔介质中无油相泡沫驱油过程中,表面活性剂浓度、界面张力和泡沫强度对发泡剂性能的影响。实验包括将气体和具有三种不同的表面活性剂溶液共同注入到Bentheimer砂岩样品中,这些样品在表面活性剂溶液初始饱和时具有不同的IFT还原性能和发泡强度。实验使用Bentheimer砂岩岩心进行,在泡沫生成过程中拍摄x射线CT图像,以确定泡沫扩展前沿的稳定性,并绘制瞬态和稳态流动状态下的气体饱和度。然后,通过一系列数值模拟研究了无油泡沫驱时表面活性剂浓度对岩心压降的影响。所实现的泡沫模型基于局部平衡,并使用液体饱和度、泡沫速度、含油饱和度和毛细数等独立函数描述泡沫迁移率减小因子的依赖关系。为此,根据恒定注入速度下泡沫流动的低质量和高质量状态下的实验数据,确定了泡沫模型中的干燥和气体速度函数。接下来,模拟了两种不同表面活性剂浓度下泡沫驱的压降曲线,以确定泡沫模型中表面活性剂依赖函数的参数。模拟结果与压降实验数据吻合较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimetal Study and Numerical Modelling of the Effect of Foaming Agent Properties on Foam Flooding in Porous Media in Absence of Oleic Phase
This paper presents an investigation on the effect of foaming agents perpropeties in tetms of surfactant concentration, interfacial tension (IFT) and foam strength during foam flooding in porous media in the absence of oleic phase. The experiments consisted of the co-injection of gas and various surfactant solutions with three different formulation properties in terms of IFT reduction and foaming strength capability into Bentheimer sandstone samples initially saturated with the surfactant solution. Experiments were performed using Bentheimer sandstone cores during, where X-ray CT images were taken during foam generation to find out the stability of advancing front of foam propagation and to map the gas saturation for both the transient and steady-state flow regimes. Then, a series of numerical simulation was conducted to investigate the effect of surfactant concentration on pressure drop across the core for the foam flooding in the absence of oil. The foam model implemented is based on a local equilibrium and describes dependency of foam mobility reduction factor using several independent functions, such as liquid saturation, foam velocity, oil saturation and capillary number. To this end, the dry-out and gas velocity functions in the foam model were determined from the experimental data obtained at low and high-quality regimes of foam flow at a constant injection velocity. Next, pressure drop profiles of foam flooding at two different surfactant concentrations were modelled to determine the parameters of the surfactant-dependent function in the foam model. The simulation results fit the experimental data of pressure drops very well.
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