Residual or capillary trapping is one of the key trapping mechanisms for CO₂ geological storage. At the Heletz, Israel, pilot injection site, two dedicated field experiments have been carried out to characterize it in-situ. This paper presents the model analyses of the second of these tests, the Residual Trapping Experiment II (RTE II). In the experiment hydraulic, tracer and thermal tests before and after the generation of the residually trapped zone are used to quantify residual saturation. The creation of the residually trapped zone is based on injection of CO₂-saturated-water following injection of free-phase supercritical CO₂. For the modeling, both a radial-symmetric model with homogeneous layer properties and 3D model with stochastically heterogeneous properties were used. Extensive parameter sensitivity studies were carried out and various well-geometry related fluid injection/withdrawal scenarios were considered. In terms of the best estimate for the maximum residual saturation, this experiment, like the previous RTE I experiment, gave the best agreement with a residual gas saturation of 0.1, this value being somewhat lower than the core-measured value of 0.2. Overall, the pressure response provided a very robust signal enabling to distinguish different values of residual saturation as well as the extent of sections where gas blocking for water flow could have occurred. Analysis of the tracer data indicated the presence of phenomena such as gas-blocking water flow, the importance of multi-layer and channelized flow and transport, and the importance of taking into account the processes in the actual injection/production well also.

残留或毛细管捕集是CO ₂地质封存的关键捕集机制之一。在以色列赫莱茨的中试注入场，已经进行了两个专门的野外实验，以对其进行现场表征。本文介绍了第二项测试的模型分析，即残留诱捕实验II（RTE II）。在实验中，在生成残留滞留区之前和之后的水力，示踪剂和热力测试用于量化残留饱和度。残留捕集区的创建基于注入自由相超临界CO ₂之后注入CO ₂饱和水。。对于建模，使用了具有均匀层属性的径向对称模型和具有随机异质性的3D模型。进行了广泛的参数敏感性研究，并考虑了各种与井眼有关的流体注入/抽取方案。就最大残留饱和度的最佳估算而言，该实验与先前的RTE I实验一样，在残留气体饱和度为0.1（与核心测量值0.2相比略有降低）方面达到了最佳一致性。总的来说，压力响应提供了一个非常可靠的信号，能够区分残留饱和度的不同值以及可能发生水流阻气的区域的范围。对示踪剂数据的分析表明存在现象，例如阻塞气体的水流，