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Evaluating numerical simulation errors of CO-brine flow with capillary heterogeneity using a 1D semi-analytical solution
Year:
2021
Authors :
Volume :
110
Co-Authors:

Ziv Moreno
Avinoam Rabinovich

Facilitators :
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Total pages:
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Abstract:

Modeling CO2-brine flow related to CO2 storage in saline aquifers involves intense numerical simulations. One of the important processes associated with these flows, allowing for safe long term storage of CO2, is residual trapping. For accurate modeling of trapping, capillary heterogeneity should be incorporated in the models. However, there have been some reports of increased numerical simulation errors associated with these models and yet no systematic study of their accuracy has been carried out.

We compare results of two numerical simulators to a semi-analytical solution of 1D two-phase immiscible steady state flow with capillary heterogeneity. Simulation errors are calculated for a wide range of different flow rates, fluid fractions, capillary pressure curves and heterogeneities. Results show that capillary pressure and saturation errors increase with smaller dimensionless capillary number and reach large values of 25−50% for many cases. It is shown that the errors are related to capillary heterogeneity and therefore increase also with larger variance of log permeability. Finally, a new approach for predicting numerical errors without employing an analytical solution is proposed, i.e., the error indicator analysis.

Note:
Related Files :
Benchmarking
CO2 Storage
Coreflood modeling
Multi-phase flow
Numerical errors
Semi-analytical solution
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More details
DOI :
10.1016/j.ijggc.2021.103416
Article number:
103416
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
55876
Last updated date:
02/03/2022 17:27
Creation date:
08/08/2021 16:07
Scientific Publication
Evaluating numerical simulation errors of CO-brine flow with capillary heterogeneity using a 1D semi-analytical solution
110

Ziv Moreno
Avinoam Rabinovich

Evaluating numerical simulation errors of CO-brine flow with capillary heterogeneity using a 1D semi-analytical solution

Modeling CO2-brine flow related to CO2 storage in saline aquifers involves intense numerical simulations. One of the important processes associated with these flows, allowing for safe long term storage of CO2, is residual trapping. For accurate modeling of trapping, capillary heterogeneity should be incorporated in the models. However, there have been some reports of increased numerical simulation errors associated with these models and yet no systematic study of their accuracy has been carried out.

We compare results of two numerical simulators to a semi-analytical solution of 1D two-phase immiscible steady state flow with capillary heterogeneity. Simulation errors are calculated for a wide range of different flow rates, fluid fractions, capillary pressure curves and heterogeneities. Results show that capillary pressure and saturation errors increase with smaller dimensionless capillary number and reach large values of 25−50% for many cases. It is shown that the errors are related to capillary heterogeneity and therefore increase also with larger variance of log permeability. Finally, a new approach for predicting numerical errors without employing an analytical solution is proposed, i.e., the error indicator analysis.

Scientific Publication
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