Quantification of CO2 masses trapped through free convection process in isothermal brine saturated reservoir

摘要: Abstract Dissolution trapping of supercritical CO2 into formation brine has been investigated as a potential mechanism for reducing buoyancy force in carbon storage formations. This study attempts to quantify how much can be stored through dissolution assuming the free-phase will dissolved continuously on top perturbed phase. Most former investigations focused physical explanations density-driven free convection instability. Our aim is compute amount (by mass) captured by until model reservoir reaches steady state. The numerical experimentation done using dimensionless mass and momentum conservation laws. major problem parameter here Rayleigh number, which we carry out an extensive survey find its low high ends based field observed data from literature in-house database. Because density difference main driving force, also investigate effects impurities retained stream contrast. We both homogeneous heterogeneous reservoirs. Also, different boundary conditions (Neumann, Dirichlet, periodic) are compared understand their effects. simulations run nearly complete saturation (∼99%) reached. For test case (T = 40 °C, P = 50 bar) geologic thermophysical conditions, have found that average 0.33–15 g dissolve per year unit volume 1 m3 saturations. this 0.28–6 g.