Essentials of Multiphase Flow and Transport in Porous Media

1. Setting the Stage. 1.1 Introduction. 1.2 Phases and Porousmedia. 1.3 Grain and Pore Size Distributions. 1.4 The Concept of Saturation. 1.5 The Concept of Pressure. 1.6 Surface Tension Considerations. 1.7 Concept of Concentration. 1.8 Summary. 1.9 Exercises. 2. Mass Conservation Equations. 2.1 Introduction. 2.2 Microscalemass Conservation. 2.3 Integral Forms Ofmass Conservation. 2.4 Integral Theorems. 2.4.1 Divergence Theorem. 2.4.2 Transport Theorem. 2.5 Point Forms Ofmass Conservation. 2.6 Themacroscale Perspective. 2.6. 1 The Representative Elementary Volume. 2.6. 2 Global and Local Coordinate Systems. 2.6. 3 Macroscopic Variables. 2.6. 4 Definitions Of Macroscale Quantities. 2.6. 5 Summary Of Macroscale Quantities. 2.7 The Averaging Theorems. 2.7. 1 Spatial Averaging Theorem. 2.7. 2 Temporal Averaging Theorem. 2.8 Macroscalemass Conservation. 2.8. 1 Macroscale Point Forms. 2.8. 2 Integral Forms. 2.9 Applications. 2.9. 1 Integral Analysis. 2.9. 2 Point Analysis. 2.10 Summary. 2.11 Exercises. 3. Flow Equations. 3.1 Introduction. 3.2 Darcy'S Experiments. 3.3 Fluid Properties. 3.4 Equations of State for Fluids. 3.4.1 Mass Fraction. 3.4.2 Mass Density and Pressure. 3.4.3 Fluid Viscosity. 3.5 Hydraulic Potential. 3.5.1 Hydrostatic Force and Hydraulic Head. 3.5.2 Derivatives of Hydraulic Head. 3.6 Single Phase Fluid Flow. 3.6. 1 Darcy'S Law. 3.6. 2 Hydraulic Conductivity and Permeability. 3.6. 3 Derivation of Groundwater Flow Equation. 3.6. 4 Recapitulation of the Derivation. 3.6. 5 Initial and Boundary Conditions. 3.6. 6 Two-Dimensional Flow. 3.7 Two-Phase Immiscible Flow. 3.7. 1 Derivation of Flowequations. 3.7. 2 Observations on the Pc - Sw Relationship. 3.7. 3 Formulas for The Pc - Sw Relationship. 3.7. 4 Observations of the Ka Rel - Sw Relationship. 3.7. 5 Formulas for the Ka Rel - Sw Relation. 3.7. 6 Special Cases of Multiphase Flow. 3.8 The Buckley-Leverett Analysis. 3.8. 1 Fractional Flow. 3.8. 2 Derivation of the Buckley-Leverett Equation. 3.8. 3 Solution of the Buckley-Leverett Equation. 3.9 Summary. 3.10 Exercises. 4. Mass Transport Equations. 4.1 Introduction. 4.2 Velocity in the Species Transport Equations. 4.2.1 Direct Approach. 4.2.2 Rigorous Approach. 4.2.3 Distribution Approach. 4.2.4 Summary. 4.3 Closure Relations for the Dispersion Vector. 4.4 Chemical Reaction Rates. 4.5 Interphase Transfer Terms. 4.5.1 Kinetic Formulation. 4.5.2 Equilibriumformulation. 4.5.3 Summary: Kinetic Vs. Equilibrium Formulations. 4.6 Initial and Boundary Conditions. 4.7 Conclusion. 4.8 Exercises. 5. Simulation. 5.1 1-D Simulation of Air-Water Flow. 5.1.1 Drainage in a Homogeneous Soil. 5.1.2 Drainage in a Heterogeneous Soil. 5.1.3 Imbibition in Homogeneous Soil. 5.2 1-D Simulation of Dnapl-Water Flow. 5.2.1 Primary Dnapl Imbibition In Homogeneous Soil. 5.2.2 Density Effect. 5.2.3 Dnapl Drainage in Homogeneous Soil. 5.2.4 Secondary Imbibition of Dnapl in Homogeneous Soil. 5.2.5 Secondary Drainage in Homogeneous Soil. 5.2.6 Primary Imbibition in Heterogeneous Soil. 5.3 2-D Simulation of Dnapl-Water Flow. 5.3.1 Dnapl Descent into a Water-Saturated Reservoir. 5.4 Simulation Of Multiphase Flow And Transport. 5.4.1 1-D Two-Phase Flow and Transport. 5.4.2 2-D Two-Phase Flow and Transport. 5.5 2-D Single-Phase Flow and Transport. 5.5.1 Base-Case. 5.5.2 Effect of Inflow. 5.5.3 Impactofwell Discharge. 5.5.4 Effect of Adsorption. 5.5.5 Effect of a Low Transmissivity Region. 5.5.6 Effect of a High Transmissivity Region. 5.5.7 Effect of Rate of Reaction. 5.6 3-D Single-Phase Flow and Transport. 5.7 2-D Three-Phase Flow. 5.8 Summary. 6. Select Symbols.