Lattice Boltzmann modeling of water and supercritical CO₂ flow in geothermal reservoir considering salt mass transfer

Supercritical CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> and brine through geothermal reservoir pores is considered a multiphase flow of partially miscible CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> and water, incorporating salt transport in the liquid phase fraction. A lattice Boltzmann model of pseudopotential flow with multiple components is adopted to study the multiphase flow. A continuous species transfer model at the phase interface characterizes the salt transport. The two models are coupled to investigate the pore permeation of multiphase flow between supercritical CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> and brine. The findings of the simulations demonstrate that, in contrast to CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> , the trend for water flow rate and relative permeability increases with increasing water saturation. Elevating the driving force causes both fluids' flow rates to rise noticeably. Flow rate and relative permeability of water expand with a solid's more hydrophobic surface while CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> flux and relative permeability shrink. Water and CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> flow rates are both decreased by increased salinity because it is more difficult for water's flow and deformation.