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Title Numerical investigation of multiphase Darcy-Forchheimer flow and contaminant transport during SO₂ co-injection with CO₂ in deep saline aquifers
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Publication Date
Date Accessioned
Degree PhD
Discipline/Department Civil and Environmental Engineering
Degree Level doctoral
University/Publisher Georgia Tech
Abstract Of all the strategies to reduce carbon emissions, carbon dioxide (CO₂) geological sequestration is an immediately available option for removing large amounts of the gas from the atmosphere. However, our understanding of the transition behavior between Forchheimer and Darcy flow through porous media during CO₂ injection is currently very limited. In addition, the kinetic mass transfer of SO₂ and CO₂ from CO₂ stream to the saline and the fully coupling between the changes of porosity and permeability and multiphase flow are two significant dimensions to investigate the brine acidification and the induced porosity and permeability changes due to SO₂ co-injection with CO₂. Therefore, this dissertation develops a multiphase flow, contaminant transport and geochemical model which includes the kinetic mass transfer of SO₂ into deep saline aquifers and obtains the critical Forchheimer number for both water and CO₂ by using the experimental data in the literature. The critical Forchheimer numbers and the multiphase flow model are first applied to analyze the application problem involving the injection of CO₂ into deep saline aquifers. The results show that the Forchheimer effect would result in higher displacement efficiency with a magnitude of more than 50% in the Forchheimer regime than that for Darcy flow, which could increase the storage capacity for the same injection rate and volume of a site. Another merit for the incorporation of Forchheimer effect is that more CO₂ would be accumulated in the lower half of the domain and lower pressure would be imposed on the lower boundary of the cap-rock. However, as a price for the advantages mentioned above, the injection pressure required in Forchheimer flow would be higher than that for Darcy flow. The fluid flow and contaminant transport and geochemical model is then applied to analyze the brine acidification and induced porosity and permeability changes due to SO₂ co-injection. The results show that the co-injection of SO₂ with CO₂ would lead to a substantially acid zone near the injecting well and it is important to include the kinetic dissolution of SO₂ from the CO₂ stream to the water phase into the simulation models, otherwise considerable errors would be introduced for the equilibrium assumption. This study provides a useful tool for future analysis and comprehension of multiphase Darcy-Forchheimer flow and brine acidification of CO₂ injection into deep saline aquifers. Results from this dissertation have practical use for scientists and engineers concerned with the description of flow behavior, and transport and fate of SO₂ during SO₂ co-injection with CO₂ in deep saline aquifers.
Subjects/Keywords Darcy-Forchheimer flow; Multiphase flow; Critical Forchheimer number; Deep saline aquifers; Contaminant transport; CO₂ sequestration; SO₂ co-injection; Darcy's law; Aquifers; Saline waters; Carbon dioxide; Carbon dioxide Environmental aspects; Carbon dioxide mitigation; Carbon sequestration; Geochemistry
Contributors Aral, Mustafa M. (advisor); Stieglitz, Marc (committee member); Luo, Jian (committee member); Guan, Jiabao (committee member); Stieglitz, Marc (committee member); Luo, Jian (committee member); Uzer, Turgay (committee member)
Language en
Country of Publication us
Record ID handle:1853/49065
Repository gatech
Date Indexed 2020-05-13
Issued Date 2013-06-24 00:00:00
Note [degree] Ph.D.;

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…the Forchheimer coefficient.......................... 22 Table 2.4 Compositions of CO2 streams (Kather, 2009) .................................................. 26 Table 3.1 Parameters for inertial flow in 1D homogeneous porous media…

…number defined by Equation (3.3) while the y axis represents the Friction factor defined as − (∇φ ) ; circle and square represent the experiment data points for βρ v | v | Forchheimer and Darcy flow, respectively; the dash dot line…

…and solid line are the regression lines for Forchheimer and Darcy flow, respectively; the two lines intercept where 1/fw=4.825, thus ( f w )c is 1/4.825=0.207) ............................................................ 40 Figure 3.2…

…50 Figure 3.6 The distribution of CO2 saturation, fnx and fnz over time for Darcy-Forchheimer flow (in all the graphs, solid lines are the contour line for CO2 saturation with the values on the lines; grey and while rectangles represent…

Forchheimer and Darcy flow in the x dirction, respectively; the dash contour line is for fnz where the most farther contour line ix from the injection node can be seen as the boundary between Forchhiemer and Darcy regimes in the z direction)…

…52 Figure 3.7 The evolution of important variables for Darcy-Forchheimer flow in the first row .................................................................................................................................... 54 Figure 3.8 The…

…variables for Darcy and DarcyForchheimer flows in the first row (in the graphs, D stands for Darcy flow while F is for Darcy-Forchheimer flow; N is for node and I is for interface)......................................... 57 Figure 3.10 Comparison…

…of CO2 pressure between Forchheimer-Darcy and Darcy flow 59 Figure 4.1 Flowchart for the numerical algorithm............................................................ 66 Figure 4.2 Model domain and boundary conditions (to represent a node, e.g…

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