The IEA Weyburn CO2 monitoring and storage project — Modeling of the long-term migration of CO2 from Weyburn

Publisher Summary This chapter gives details of the models and provides the results of the assessment of the long-term fate of CO 2 injected into the Weyburn field for enhanced oil recovery (EOR) operations. A system model was established to define the spatial and temporal extents of the assessment. The Base Scenario was developed to identify key processes, features, and events (FEPs) for the expected evolution of the storage system. A compositional reservoir simulator with equations-of-states (EOS) was used as the modeling tool in order to simulate multiphase, multi-component flow and transport coupled with CO 2 mass partitioning into all three phases. A deterministic treatment to CO 2 migration was applied in the geosphere, whereas the variability of abandoned wells necessitates a stochastic treatment. The results show that the geosphere is able to contain the injected CO 2 for at least 5000 years. The well results show that the likely cumulative leakage via all the existing wells in the field is less than 0.001% of the CO 2 -in-place at the end of EOR.