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Modeling of solute transport with the random walk method
66A 892121 Drainage performance and capillary-pressure curves with a new centrifuge Firoozabadi, A; Soroosh, H; Hasanpour, G J Pet Technol V40. N7, July 1988, P913-919 A centrifuge apparatus has been designed to collect data on the gravity drainage performance and drainage capillary pressure of a variety of sandstone, limestone and dolomite reservoir rock samples. The apparatus and core preparation techniques are described. Results show permeability may be an important property influencing ultimate recovery, and should provide insight into the drainage of oil from porous media.
892122 Descriptive theory of fingering during infiltration into layered soils Hillel, D; Baker, R S Soil Sci V146, NI. July 1988, P51-56 Fingering during multiphase fluid flow and displacement in porous media is well understood. A simple explanation of fingering during infiltration and redistribution is presented. The basic hypothesis is that a spatially distributed flow field tends to constrict where the flow accelerates, and,if the flow field is wide, it tends to break into discrete, concentrated current. As a result, initially parallel streamlines tend to converge and form spatially separated currents along the direction of flow. This can occur particularly during infiltration from a less permeable top layer to a more permeable sublayer, if the conductivity of the sublayer at the suction of water entry exceeds the flux through the top layer. This simple hypothesis fits the criterion of Occam's razor and should lend itself to experimental testing.
892123 Laboratory measurement of permeability in rock Holder, J; Koelsch, T; Fruth, L; Donath, F Key Questions in Rock Mechanics: Proc 29th US Symposium, Minneapolis, 13-15 June 1988 P207-214. Publ Rotterdam: A A Balkema, 1988 Steady state and pulse decay techniques were used to determine the permeability of rock salt specimens in the laboratory. Results are discussed considering two points: (1) do test results accurately reflect properties of test specimens; and (2) how may laboratory test results be extrapolated to in situ conditions, considering the heterogeneity of rock salt in the field.
892 ! 24 Hydrodynamic dispersion in model porous media Ganoulis, J G Proc NA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Quality Modelling, Lisbon, 2-6 June 1987 P215-226. Publ Dordrecht: Reidel, 1987 Numerical simulation is described of mass transport of a solute in laminar flow through spatially periodic porous media comprised of rods of circular or square section in parallel rows. Convective diffusion at the pore and laboratory scale and the nature of macroscopic dispersion coefficients are studied using finite difference and finite clement methods. Laboratory experiments are used to check accuracy of some modelling. Variations from Fickian behaviour become important where laminar eddies and flow separation occur.
892125 Random walk method in pollutant transport simulation Kinzelbach. W Proc NA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Qua~ty Alodelling, Lisbon, 2-6 June 1987 P227-245. Publ Dordrecht: Reidel. 1987 Solution to transport of tracer equations by standard finite difference or finite element techniques requires restrictive spatial discretization to avoid numerical dispersion. The random walk method offers a robust alternative at lower computational effort. It is discussed for the case of an ideal tracer starting out from the Ito-Fokker-Planck equation. Chemical reactions, adsorption and non-Fickian dispersion can be incorporated. Shortcomings of the method are discussed. The random walk method is applied to a field case of pollution by hydrocarbons. 892126 Modeling of solute transport with the random walk method Uffink, G J M Proc ?CA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Quality Modelling, Lisbon, 2-6 June 1987 P247-265. Publ Dordrecht: Reidel, 1987 Modelling of advective-dispersive transport using the random walk method, based on the Fokker-Planck equation, is discussed. Simulations suggest that at areas of low permeability or stagnation points flow becomes very low and high solute concentrations may build up. This is not predicted by the conventional advection-dispersion equation. Ignoring this difference will result in flow opposite to the gradient of the dispersion coefficient. The use of the correct coefficient in the Fokker-Planck equation eliminates this difference. 892127 Modelling of flow through fractured rocks: geostatistical generation of fracture networks. Stress-flow relationship in fractures Feuga, B Proc NA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Quality Modelling, Lisbon, 2-6 June 1987 P269-297. Publ Dordrecht: Reidel, 1987 Modelling of flow through deep hard rocks requires knowledge of the fracture networks and their behaviour under stress and its influence on flow. Geostatistical techniques to generate realistic fracture fields for modelling flow are demonstrated. The stress/flow/closure behaviour of a fracture in granite has been studied in the laboratory. Results suggest flow laws do not apply in narrow fractures due to a channelling phenomenon. The modelling of this phenomenon is investigated. 892128 Combined seismic and hydraulic method of modeling flow in fractured low permeability rocks Witherspoon, P A; Long, J C S; Majer, E L; Myer, L R Proc NA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Quality Modelling, Lisbon, 2-6 June 1987 P299-329. Publ Dordrecht: Reidel, 1987 Groundwater flow in rocks where fracture networks are the dominant flow paths is studied. Laboratory characterisation of such conditions is summarised, and modelling techniques and effects of fracture interconnection and fracture aperture on transport examined. The use of vertical seismic profiling to acquire suitable data is considered. Results of experiments in a
,© 1989 Pergamon Press plc. Reproduction not permitted
892122 Descriptive theory of fingering during infiltration into layered soils Hillel, D; Baker, R S Soil Sci V146, NI. July 1988, P51-56 Fingering during multiphase fluid flow and displacement in porous media is well understood. A simple explanation of fingering during infiltration and redistribution is presented. The basic hypothesis is that a spatially distributed flow field tends to constrict where the flow accelerates, and,if the flow field is wide, it tends to break into discrete, concentrated current. As a result, initially parallel streamlines tend to converge and form spatially separated currents along the direction of flow. This can occur particularly during infiltration from a less permeable top layer to a more permeable sublayer, if the conductivity of the sublayer at the suction of water entry exceeds the flux through the top layer. This simple hypothesis fits the criterion of Occam's razor and should lend itself to experimental testing.
892123 Laboratory measurement of permeability in rock Holder, J; Koelsch, T; Fruth, L; Donath, F Key Questions in Rock Mechanics: Proc 29th US Symposium, Minneapolis, 13-15 June 1988 P207-214. Publ Rotterdam: A A Balkema, 1988 Steady state and pulse decay techniques were used to determine the permeability of rock salt specimens in the laboratory. Results are discussed considering two points: (1) do test results accurately reflect properties of test specimens; and (2) how may laboratory test results be extrapolated to in situ conditions, considering the heterogeneity of rock salt in the field.
892 ! 24 Hydrodynamic dispersion in model porous media Ganoulis, J G Proc NA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Quality Modelling, Lisbon, 2-6 June 1987 P215-226. Publ Dordrecht: Reidel, 1987 Numerical simulation is described of mass transport of a solute in laminar flow through spatially periodic porous media comprised of rods of circular or square section in parallel rows. Convective diffusion at the pore and laboratory scale and the nature of macroscopic dispersion coefficients are studied using finite difference and finite clement methods. Laboratory experiments are used to check accuracy of some modelling. Variations from Fickian behaviour become important where laminar eddies and flow separation occur.
892125 Random walk method in pollutant transport simulation Kinzelbach. W Proc NA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Qua~ty Alodelling, Lisbon, 2-6 June 1987 P227-245. Publ Dordrecht: Reidel. 1987 Solution to transport of tracer equations by standard finite difference or finite element techniques requires restrictive spatial discretization to avoid numerical dispersion. The random walk method offers a robust alternative at lower computational effort. It is discussed for the case of an ideal tracer starting out from the Ito-Fokker-Planck equation. Chemical reactions, adsorption and non-Fickian dispersion can be incorporated. Shortcomings of the method are discussed. The random walk method is applied to a field case of pollution by hydrocarbons. 892126 Modeling of solute transport with the random walk method Uffink, G J M Proc ?CA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Quality Modelling, Lisbon, 2-6 June 1987 P247-265. Publ Dordrecht: Reidel, 1987 Modelling of advective-dispersive transport using the random walk method, based on the Fokker-Planck equation, is discussed. Simulations suggest that at areas of low permeability or stagnation points flow becomes very low and high solute concentrations may build up. This is not predicted by the conventional advection-dispersion equation. Ignoring this difference will result in flow opposite to the gradient of the dispersion coefficient. The use of the correct coefficient in the Fokker-Planck equation eliminates this difference. 892127 Modelling of flow through fractured rocks: geostatistical generation of fracture networks. Stress-flow relationship in fractures Feuga, B Proc NA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Quality Modelling, Lisbon, 2-6 June 1987 P269-297. Publ Dordrecht: Reidel, 1987 Modelling of flow through deep hard rocks requires knowledge of the fracture networks and their behaviour under stress and its influence on flow. Geostatistical techniques to generate realistic fracture fields for modelling flow are demonstrated. The stress/flow/closure behaviour of a fracture in granite has been studied in the laboratory. Results suggest flow laws do not apply in narrow fractures due to a channelling phenomenon. The modelling of this phenomenon is investigated. 892128 Combined seismic and hydraulic method of modeling flow in fractured low permeability rocks Witherspoon, P A; Long, J C S; Majer, E L; Myer, L R Proc NA TO Advanced Research Workshop on Advances in Analytical and Numerical Groundwater Flow and Quality Modelling, Lisbon, 2-6 June 1987 P299-329. Publ Dordrecht: Reidel, 1987 Groundwater flow in rocks where fracture networks are the dominant flow paths is studied. Laboratory characterisation of such conditions is summarised, and modelling techniques and effects of fracture interconnection and fracture aperture on transport examined. The use of vertical seismic profiling to acquire suitable data is considered. Results of experiments in a
,© 1989 Pergamon Press plc. Reproduction not permitted