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Effect of dispersion on the onset of convection during CO2 sequestration

  • JUAN J. HIDALGO (a1) (a2) and JESÚS CARRERA (a2)

Dissolution of carbon dioxide (CO2) injected into saline aquifers causes an unstable high-density diffusive front. Understanding how instability fingers develop has received much attention because they accelerate dissolution trapping, which favours long-term sequestration. The time for the onset of convection as the dominant transport mechanism has been traditionally studied by neglecting dispersion and treating the CO2–brine interface as a prescribed concentration boundary by analogy to a thermal convection problem. This work explores the effect of these simplifications. Results show that accounting for the CO2 mass flux across the prescribed concentration boundary has little effect on the onset of convection. However, accounting for dispersion causes a reduction of up to two orders of magnitude on the onset time. This implies that CO2 dissolution can be accelerated by activating dispersion as a transport mechanism, which can be achieved adopting a fluctuating injection regime.

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E. Abarca , J. Carrera , X. Sanchez-Vila & M. Dentz 2007 Anisotropic dispersive Henry problem. Adv. Water Resour. 30 (4), 913926.

J. J. Adams & S. Bachu 2002 Equations of state for basin geofluids: algorithm review and intercomparison for brines. Geofluids 2 (4), 257271.

J. Bear 1972 Dynamics of Fluids in Porous Media. Elsevier.

B. Bijeljic & M. J. Blunt 2007 Pore-scale modelling of transverse dispersion in porous media. Water Resour. Res. 43 (12), W12S11.

M. Dentz & J. Carrera 2003 Effective dispersion in temporally fluctuating flow through a heterogeneous medium. Phys. Rev. E 68 (3), 036310.

G. Ferguson & A. D. Woodbury 2005 Thermal sustainability of groundwater-source cooling in Winnipeg, Manitoba. Can. Geotech. J. 42 (5), 12901301.

L. W. Gelhar , C. Welty & K. R. Rehfeldt 1992 A critical-review of data on field-scale dispersion in aquifers. Water Resour. Res. 28 (7), 19551974.

S. M. Hassanizadeh & T. Leijnse 1988 On the modelling of brine transport in porous-media. Water Resour. Res. 24 (3), 321330.

J. J. Hidalgo , J. Carrera & M. Dentz 2009 aSteady state heat transport in 3D heterogeneous porous media. Adv. Water Resour. 32, 12061212.

J. J. Hidalgo , J. Carrera & A. Medina 2009 bRole of salt sources in density-dependent flow. Water Resour. Res. 45, W05503.

K. Johannsen 2003 On the validity of the Boussinesq approximation for the Elder problem. Comput. Geosci. 7 (3), 169182.

K. S. Lackner , C. H. Wendt , D. P. Butt , E. L. Joyce & D. H. Sharp 1995 Carbon-dioxide disposal in carbonate minerals. Energy 20 (11), 11531170.

A. Landman & R. Schotting 2007 Heat and brine transport in porous media: the Oberbeck–Boussinesq approximation revisited. Transp. Porous Med. 70 (3), 355373.

E. Lindeberg & P. Bergmo 2003 The long-term fate of CO2 injected into an aquifer. In Greenhouse Gas Control Technologies – Sixth International Conference (ed. J. Gale & Y. Kaya ), pp. 489494. Pergamon.

H. Liu H. & J. H. Dane 1997 A numerical study on gravitational instabilities of dense aqueous phase plumes in three-dimensional porous media. J. Hydrol. 194 (1–4), 126142.

D. A. S. Rees , A. Selim & J. P. Ennis-King 2008 The instability of unsteady boundary layers in porous media. In Emerging Topics in Heat and Mass Transfer in Porous Media. From Bioengineering and Microelectronics to Nanotechnology (ed. P. Vadasz ), Theory and Applications of Transport in Porous Media, vol. 22, pp. 85110. Springer.

A. Riaz , M. Hesse , H. A. Tchelepi & F. M. Orr 2006 Onset of convection in a gravitationally unstable diffusive boundary layer in porous media. J. Fluid Mech. 548, 87111.

R. J. Rosenbauer , T. Koksalan & J. L. Palandri 2005 Experimental investigation of CO2–brine–rock interactions at elevated temperature and pressure: implications for CO2 sequestration in deep saline aquifers. Fuel Process. Technol. 86 (14–15), 15811597.

M. W. Saaltink , J. Carrera & S. Olivella 2004 Mass balance errors when solving the convective form of the transport equation in transient flow problems. Water Resour. Res. 40 (5), W05107.

R. A. Schincariol , F. W. Schwartz & C. A. Mendoza 1994 On the generation of instabilities in variable-density flow. Water Resour. Res. 30 (4), 913927.

A. Selim & D. A. S. Rees 2007 The stability of a developing thermal front in a porous medium. Part I. Linear theory. J. Porous Med. 10 (1), 115.

K.-K. Tan , T. Sam & H. Jamaludin 2003 The onset of transient convection in bottom heated porous media. Intl J. Heat Mass Transfer 46 (15), 28572873.

X. F. Xu , S. Y. Chen & D. X. Zhang 2006 Convective stability analysis of the long-term storage of carbon dioxide in deep saline aquifers. Adv. Water Resour. 29 (3), 397407.

C. Yang & Y. Gu 2006 Accelerated mass transfer of CO2 in reservoir brine due to density-driven natural convection at high pressures and elevated temperatures. Indus. Engng Chem. Res. 45 (8), 24302436.

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  • ISSN: 0022-1120
  • EISSN: 1469-7645
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