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  • 1
    Electronic Resource
    Electronic Resource
    Micellar/polymer physical-property models for contaminant cleanup problems and enhanced oil recovery (1996)
    Springer
    Transport in porous media 24 (1996), S. 35-79 
    Details
    ISSN: 1573-1634
    Keywords: SEAR ; EOR ; surfactant ; polymer ; remediation ; physical properties ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract Previous pseudo-phase representations of micellar/polymer phase behavior have been highly successful in simulating enhanced oil recovery processes using conventional numerical methods. These models allowed for a variety of physical phenomena, such as the formation of one to three phases, the effect of salinity and co-solvents on the phase behavior, adsorption of several of the chemical species, capillary desaturation, and polymer shear thinning and permeability reduction. In order to extend these models to either higher-order simulation techniques or to contaminant transport problems, it is necessary to remove previous discontinuities in the model behavior and to improve the predictions as concentrations become infinitesimal. In this paper, we provide a complete description of a revised model that avoids the problems of the previous model, and we show how to implement the computations in a numerically stable fashion. Computational results from a North Sea pilot study are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00175603
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Application of higher-order flux-limited methods in compositional simulation (1994)
    Springer
    Transport in porous media 16 (1994), S. 1-29 
    Details
    ISSN: 1573-1634
    Keywords: higher-order finite-difference methods ; high-resolution methods ; TVD flux limiters ; reservoir simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract A higher-order flux-limited finite-difference scheme has been implemented into a compositional simulator to discretize the convection terms of the component conservation equations and the relative permeability terms of the phase fluxes. Harten's total variation diminishing criteria are imposed directly to the finite-difference equations and the bounds of the flux limiters which are suitable for larger Courant numbers and nonuniform grid systems are obtained. A time-correction technique is applied to increase the time accuracy and improve the stability condition. The scheme has been tested for miscible and immiscible flow problems in one and two dimensions, and the results were compared with those using a third-order method without flux limiting and some available analytical solutions. It has been shown that the scheme effectively reduces numerical dispersion and results in superior resolution of concentration and saturation fronts compared to conventional schemes. The stability conditions are also improved by using a time-correction technique. The results of the scheme are in good agreement with the analytical solutions. These improvements were achieved with negligible increase in computational effort. The scheme can also be applied to simulation problems with nonuniform gridblock sizes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01059774
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of the three-phase oil relative permeability models (1989)
    Springer
    Transport in porous media 4 (1989), S. 59-83 
    Details
    ISSN: 1573-1634
    Keywords: Three-phase flow ; relative permeability models ; enhanced oil recovery ; ground water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract A comparative study of seven different methods for predicting three-phase oil relative permeabilities in the presence of gas and water phases is presented. Predicted oil relative permeabilities from these correlations have been compared with published three-phase experimental data obtained in Berea sandstone core samples. Some of the correlations under study have been recently developed and have never been tested against the laboratory data. The comparison shows that the commonly used models such as Stones' often do not give accurate predictions of the experimental data. It is concluded that the recently developed models fit the experimental data as well as or better than the previously developed and widely used three-phase oil relative permeability models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00134742
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  • 4
    Electronic Resource
    Electronic Resource
    Characterizing heterogeneous permeable media with spatial statistics and tracer data using sequential simulated annealing (1995)
    Springer
    Mathematical geology 27 (1995), S. 763-787 
    Details
    ISSN: 1573-8868
    Keywords: sequential simulated annealing ; semianalytic tracer response ; integrated heterogeneity modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Characterizing heterogeneous permeable media using flow and transport data typically requires solution of an inverse problem. Such inverse problems are intensive computationally and may involve iterative procedures requiring many forward simulations of the flow and transport problem. Previous attempts have been limited mostly to flow data such as pressure transient (interference) tests using multiple observation wells. This paper discusses an approach to generating stochastic permeability fields conditioned to geologic data in the form of a vertical variogram derived from cores and logs as well as fluid flow and transport data, such as tracer concentration history, by sequential application of simulated annealing (SA). Thus, the method incorporates elements of geostatistics within the framework of inverse modeling. For tracer-transport calculations, we have used a semianalytic transit-time algorithm which is fast, accurate, and free of numerical dispersion. For steady velocity fields, we introduce a “transit-time function” which demonstrates the relative importance of data from different sources. The approach is illustrated by application to a set of spatial permeability measurements and tracer data from an experiment in the Antolini Sandstone, an eolian outcrop from northern Arizona. The results clearly reveal the importance of tracer data in reproducing the correlated features (channels) of the permeability field and the scale effects of heterogeneity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02273537
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  • 5
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    Characterizing heterogeneous permeable media with spatial statistics and tracer data using sequential simulated annealing (1995)
    Springer
    Details
    Publication Date: 1995-08-01
    Print ISSN: 1874-8961
    Electronic ISSN: 1874-8953
    Topics: Geosciences , Mathematics
    Published by Springer
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  • 6
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    Application of higher-order flux-limited methods in compositional simulation (1994)
    Springer
    Details
    Publication Date: 1994-07-01
    Print ISSN: 0169-3913
    Electronic ISSN: 1573-1634
    Topics: Geosciences , Technology
    Published by Springer
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    PAPER CURRENT
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