Carbon capture and storage (CCS) is one of the primary mechanisms being studied and implemented globally toward the push for a healthier planet. Dynamic modeling of carbon dioxide (CO2) storage indepleted gas reservoirs requires a great amount of integration between various domains, including reservoir engineering, production engineering, geomechanics, well integrity, and geology. In this paper we will highlight various important areas of integration that are necessary to consider while conducting a dynamic modeling study for CO2 storage.

Multidomain integration is required at various stages of the dynamic modeling of CO2 storage in depleted gas reservoirs. To decide the suitable boundary conditions, it is important that geological aspects of the structure are fully integrated. Thorough cyclic integration between the reservoir, production engineering, and well integrity is needed to ensure that realistic operational conditions for the injection well are computed and considered during dynamic modeling.

In this paper we will show, with the help of a recent case study, the methodology and importance of multidomain integration for accurately modeling the CO2 storage in a depleted gas reservoir. Integration between geology and reservoir engineering is crucial while selecting the CO2 storage sites as well as while deciding the applicable boundary conditions. Geomechanics plays a vital role in defining the fracture gradient for each well for different formations. This fracture gradient is an important value to consider while selecting the bottomhole injection pressure limits for the dynamic simulation. Similarly, a close integration between reservoir engineering, production engineering, and well integrity is crucial to establish valid operational conditions, pressure, and temperature, which will enable the required injection rates to be injected without encroaching toward freezing conditions and hydrate formation, among others.

Several innovative integration workflows were created during this study. These include integration of geology and reservoir engineering for boundary conditions selection, integration of geomechanics and dynamic modeling, and integration of production, reservoir engineering and well integrity for selection of valid operational conditions.