Capillary trapping is one of the quickest mechanism by which carbon dioxide (CO₂) is trapped during geological sequestration. It is also of the most immediate importance because a significant fraction of the injected CO₂ can be stored and rendered immobile in the event of a leak. Many research papers have been published in the past decade focusing on improving capillary trapping of CO₂ during geological sequestration. In this study, a different approach was investigated, which involved the use of colloidal materials to enhance capillary trapping of CO₂ during sequestration in saline aquifers. A suite of reservoir condition laboratory experiments was conducted on some selected reservoir rock samples saturated with synthetic brine to mimic actual saline aquifers. A foaming agent (0.025% wt. nonionic surfactant) was dissolved in the brine. Foams were then generated in the rock samples by alternate injection of gas and brine using a coreflooding setup. An electrical resistivity measuring tool attached to the setup was used for real-time and in-situ tracking of pore-scale events such as gas movement, capillary trapping of gas, and the stability of the trapped gas. Both Nitrogen (N₂) and CO₂ gases were investigated and the results showed a tremendous increase in the amount of trapped N₂ and CO₂ gases when foams were applied compared to gas injection without foams. However, low interfacial tension between CO₂ and the surfactant solution affected the viability of foams in trapping CO₂. Nevertheless, the use of CO₂ foam stabilizers is promising in addressing this challenge. The methodology described in this paper can be used to test the efficiency of a variety of CO₂ foam stabilizing agents that may be developed.

毛细管捕获是在地质封存过程中捕获二氧化碳（CO ₂）的最快机制之一。这也是最直接的重要性，因为在泄漏的情况下，很大一部分注入的CO ₂可以存储并变得不动。在过去的十年中，已经发表了许多研究论文，重点是在地质封存过程中改善CO _2的毛细管捕集。在这项研究中，研究了一种不同的方法，该方法涉及使用胶体材料来增强CO _2的毛细管捕集。在盐质含水层中被隔离的过程中。在一些用合成盐水饱和的选定储层岩石样品上进行了一套储层条件实验室实验，以模拟实际的盐水层。将发泡剂（0.025重量％的非离子表面活性剂）溶解在盐水中。然后使用岩心驱替装置交替注入气体和盐水，从而在岩石样品中产生泡沫。连接到该装置的电阻率测量工具用于实时实时地跟踪孔尺度事件，例如气体移动，气体的毛细管捕集和捕集气体的稳定性。研究了氮气（N ₂）和CO ₂气体，结果表明，捕集的N ₂和CO ₂的量大大增加了与不使用泡沫的气体注入相比，使用泡沫时的气体较少。然而，CO ₂和表面活性剂溶液之间的低界面张力影响了泡沫捕集CO ₂的可行性。然而，使用CO ₂泡沫稳定剂有望解决这一挑战。本文中描述的方法可用于测试可能开发的各种CO ₂泡沫稳定剂的效率。