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Coupled CO2‐well‐reservoir simulation using a partitioned approach: effect of reservoir properties on well dynamics

Svend Tollak Munkejord, Morten Hammer, Åsmund Ervik, Lars Hov Odsæter and Halvor Lund

Greenhouse Gases: Science and Technology, 2021, vol. 11, issue 1, 103-127

Abstract: We present a model framework for dynamic simulation of the flow of CO2 and other components in an injection well coupled with a near‐well reservoir. With a partitioned approach, we employ numerical methods adapted to the governing equations in each domain. In both well and reservoir, accurate thermodynamics are used. This model can be used for various design and operational considerations for CO2‐injection wells, that is, the quantification of pressure and temperature transients, and phase composition, including the appearance of a water‐rich phase. We study cases where the flow in the well and the near‐well reservoir is dynamically coupled. The rock properties are seen to strongly affect the well dynamics, both regarding magnitude and transient evolution of the bottom‐hole pressure. We consider a variation of this case where water is co‐injected with CO2, showing that this is a potential method to mitigate salt precipitation. We also consider intermittent injection, representing the case of direct injection from ships transporting CO2. Finally, we observe that in the present cases, a coupled model (as opposed to a well‐only model) is necessary in order to capture the dynamics in the well during injection. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2021
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https://doi.org/10.1002/ghg.2035

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