1887

Abstract

Summary

Interaction between CO2 and oil exhibits complex phase behavior that results in gravity-driven convection and enhanced mixing of CO2 in the oil zone. We have shown that the density of oil increases between 4% and 6% at CO2 concentrations between 65% and 75% by mass. Different cubic EoS give different values for density of CO2-oil mixtures. The increase in oil density leads to an unstable density inversion, instigating convection in a 100 mD aquifer in a few days. The convection enhances the rate of CO2 uptake in the oil, with long-term steady rates from 500 kg/m2/y up to 800 kg/m2/y. The rate has some dependency on the EoS assumed in the computational model. The convective process substantially increases CO2 uptake in the oil zone compared to the diffusion process alone. Enhanced CO2 uptake has important implications for injection into depleted reservoirs and EOR/EGR operations, which is the subject of future work.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201414266
2015-10-13
2024-03-29
Loading full text...

Full text loading...

References

  1. Aavatsmark, I.
    [1995] Mathematische Einführung in die Thermodynamik der Gemische. Akademie Verlag, Berlin.
    [Google Scholar]
  2. Computer Modelling Group (CMG)
    Computer Modelling Group (CMG) [2006] GEM User Guide. http://www.cmgl.ca/software/gem2014
    [Google Scholar]
  3. Elenius, M.T. and Johannsen, K.
    [2012] On the time scales of non-linear instability in miscible displacement porous media flow. Computational Geosciences, 16(4).
    [Google Scholar]
  4. Kunz, O. and Wagner, W.
    [2012] The GERG-2008 wide-range equation of state for natural gases and other mixtures: an expansion of GERG-2004. J. Chemical & Engineering Data, 57, 3032–3091.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201414266
Loading
/content/papers/10.3997/2214-4609.201414266
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error