In order to quantify CO₂ residual trapping in situ, two dedicated single-well push-pull experiments have been carried out at the Heletz, Israel pilot CO₂ injection site. Field data from some parts of these experiments suggests the important effect of the hydrodynamic behavior in the injection-withdrawal well. In the present work a model capturing the CO₂ transport and trapping behavior during Heletz Residual Trapping Experiment I is developed, with a special focus on coupled wellbore-reservoir flow. The simulation is carried out with the numerical simulator T2Well/ECO2N (Pan et al. 2011) which considers the wellbore-reservoir coupling. Of particular interest is to accurately model the period when the well is open to the atmosphere and self-producing CO₂ and water in a geyser-like manner. It is also of interest to identify what conditions are causing the oscillating pressure-temperature behavior and the associated periodic gas-liquid releases, as well as to determine the amount of gas lost from the reservoir during this period. The results suggest that the behavior is due to cyclical CO₂ exsolution from the aqueous phase along with a reduction of mobility of both CO₂ and brine in the near wellbore-reservoir area, the latter being due to a zone of dispersed CO₂ bubbles near the wellbore. This behavior could be successfully captured with a new set of relative permeability functions developed earlier for CO₂ exsolution in laboratory experiments (Zuo et al., 2013).

为了量化原位捕集的CO ₂残留量，已经在以色列Heletz的CO ₂试点注入地点进行了两个专用的单井推挽实验。这些实验的某些部分的现场数据表明，水动力行为对注水井的重要影响。在目前的工作中，捕获CO ₂的模型开展了Heletz剩余油井捕集实验I期间的输运和捕集行为，并特别关注井眼-储层耦合流。模拟是使用数值模拟程序T2Well / ECO2N（Pan等，2011）进行的，其中考虑了井筒与储层的耦合。特别感兴趣的是准确模拟井向大气开放并以类似间歇泉的方式自产CO ₂和水的时期。确定引起振荡压力-温度行为和相关的周期性气液释放的条件，以及确定在此期间从储层中损失的气体量也很有意义。结果表明该行为是由于周期性的CO ₂在井眼-储层附近，水相中的CO ₂和盐水的迁移率降低，这归因于井眼附近的分散的CO ₂气泡区域。在实验室实验中，可以使用较早开发的一组新的相对渗透率函数成功捕获这种行为，该函数是为CO _2的释放而开发的（Zuo等人，2013）。