多孔介质中的CO 2流动对于提高石油采收率和地下碳储存都至关重要。为了改善CO 2流度控制和提高储层波及效率，经常应用水-气交替(WAG)注入。然而，由于微尺度储层非均质性的存在导致天然气的早期突破，WAG 的有效性会减弱。在整篇论文中，作者提出聚合物辅助 WAG (PA-WAG) 作为降低气体流动性和水相流动性的替代方法，从而提高 WAG 的性能。在该方法中，将高分子量水溶性聚合物添加到水段中。
最近，PA-WAG 作为一种减轻 WAG 注入过程中早期气体突破和重力偏析的方法而受到关注。
CO2 flow in porous media is vital for both enhanced oil recovery and underground carbon storage. For improving CO2 mobility control and improved reservoir sweep efficiency, water-alternating-gas (WAG) injection often has been applied. The effectiveness of WAG diminishes, however, because of the presence of microscale reservoir heterogeneity that results in an early breakthrough of gas. In the complete paper, the authors propose polymer-assisted WAG (PA-WAG) as an alternative method to reduce gas mobility and the mobility of the aqueous phase, consequently improving the performance of WAG. In this method, high-molecular-weight water-soluble polymers are added to the water slug.
Recently, PA-WAG has received attention as a method to mitigate early gas breakthrough and gravity segregation during WAG injection.
