Reduction of the CO₂ mobility is beneficial during subsurface sequestration of anthropogenic CO₂ in saline aquifers and hydrocarbon reservoirs by mitigating flow instabilities leading to early gas breakthrough and poor sweep efficiency. Injection of CO₂ foam is a field-proven technology for gas mobility control. Foam generation and coalescence are compared between six commercially available surfactants with a range in CO₂ solubility, during unsteady state injection of dense CO₂-foam in a long sandstone outcrop core (1.15 m). Foam generation categories and foam decay were defined based on the observed changes in foam apparent viscosity during generation and coalescence. The degree of CO₂ solubility influenced apparent viscosity development and peak foam strength for the tested surfactants. Variations in foam peak strength resulted in a range of water saturations at CO₂ breakthrough (up to 24 percentage points difference observed experimentally), with implications for the CO₂ storage capacity.

的CO的还原₂迁移率是人为CO的地下封存期间有益₂通过减轻流动不稳定性导致早期气体突破和扫描效率差在盐水含水层和油气藏。注入CO ₂泡沫是一种经过现场验证的气体迁移率控制技术。比较了在长砂岩露头岩心（1.15 m）中以非稳态注入致密CO ₂泡沫的非稳态注入过程中，对六种具有一定CO ₂溶解度的市售表面活性剂进行了泡沫生成和聚结。基于在产生和聚结期间观察到的泡沫表观粘度的变化来定义泡沫产生类别和泡沫衰减。CO ₂的程度溶解度影响表观粘度的发展和测试表面活性剂的峰值泡沫强度。泡沫峰强度的变化导致在CO ₂突破时出现一定范围的水饱和度（实验观察到的差异高达24个百分点），这对CO _2的储存能力有影响。