Pore-scale study based on lattice Boltzmann method of density driven natural convection during CO2 injection project

doi:10.1016/j.cjche.2015.07.010

摘要/Abstract

摘要： Saline aquifers are chosen for geological storage of greenhouse gas CO₂ because of their storage potential. In almost all cases of practical interest, CO₂ is present on top of the liquid and CO₂ dissolution leads to a small increase in the density of the aqueous phase. This situation results in the creation of negative buoyancy force for downward density-driven natural convection and consequently enhances CO₂ sequestration. In order to study CO₂ injection at pore-level, an isothermal Lattice Boltzmann Model (LBM)with two distribution functions is adopted to simulate density-driven natural convection in porous media with irregular geometry obtained by image treatment. The present analysis showed that after the onset of natural convection instability, the brine with a high CO₂ concentration infringed into the underlying unaffected brine, in favor of the migration of CO₂ into the pore structure. With low Rayleigh numbers, the instantaneous mass flux and total dissolved CO₂ mass are very close to that derived from penetration theory (diffusion only), but the fluxes are significantly enhanced with high Ra number. The simulated results show that as the time increases, some chaotic and recirculation zones in the flow appear obviously, which promotes the renewal of interfacial liquid, and hence enhances dissolution of CO₂ into brine. This study is focused on the scale of a few pores, but shows implications in enhanced oil/gas recovery with CO₂ sequestration in aquifers.

关键词: Lattice Boltzmann method, Density driven, Pore-scale, CO₂, Mass, transfer

Abstract: Saline aquifers are chosen for geological storage of greenhouse gas CO₂ because of their storage potential. In almost all cases of practical interest, CO₂ is present on top of the liquid and CO₂ dissolution leads to a small increase in the density of the aqueous phase. This situation results in the creation of negative buoyancy force for downward density-driven natural convection and consequently enhances CO₂ sequestration. In order to study CO₂ injection at pore-level, an isothermal Lattice Boltzmann Model (LBM)with two distribution functions is adopted to simulate density-driven natural convection in porous media with irregular geometry obtained by image treatment. The present analysis showed that after the onset of natural convection instability, the brine with a high CO₂ concentration infringed into the underlying unaffected brine, in favor of the migration of CO₂ into the pore structure. With low Rayleigh numbers, the instantaneous mass flux and total dissolved CO₂ mass are very close to that derived from penetration theory (diffusion only), but the fluxes are significantly enhanced with high Ra number. The simulated results show that as the time increases, some chaotic and recirculation zones in the flow appear obviously, which promotes the renewal of interfacial liquid, and hence enhances dissolution of CO₂ into brine. This study is focused on the scale of a few pores, but shows implications in enhanced oil/gas recovery with CO₂ sequestration in aquifers.

Key words: Lattice Boltzmann method, Density driven, Pore-scale, CO₂, Mass, transfer

Abdelmalek Atia, Kamal Mohammedi. Pore-scale study based on lattice Boltzmann method of density driven natural convection during CO₂ injection project[J]. , 2015, 23(10): 1593-1602.

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Pore-scale study based on lattice Boltzmann method of density driven natural convection during CO₂ injection project

Pore-scale study based on lattice Boltzmann method of density driven natural convection during CO₂ injection project

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