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  • Books
  • Articles  (24)
  • 2005-2009  (1)
  • 1990-1994  (23)
  • Technology  (24)
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  • Books
  • Articles  (24)
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  • 1
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    A lattice model of foam flow in porous media: A percolation approach (1993)
    Springer
    Details
    Publication Date: 1993-05-01
    Print ISSN: 0169-3913
    Electronic ISSN: 1573-1634
    Topics: Geosciences , Technology
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    A lattice model of foam flow in porous media: A percolation approach (1993)
    Springer
    Transport in porous media 11 (1993), S. 139-159 
    Details
    ISSN: 1573-1634
    Keywords: Foam flow ; Percolation ; Mobility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract Because fluid flow in porous media is opaque to most observational techniques simulations of the processes occurring in porous media have become important. Typical reservoir simulations treat the flow as taking place in some averaged (Darcy-scale) medium but simulations can also be carried out at the level of the network of pores and throats of the porous medium. We report the results of a pore-scale investigation of mechanisms for the alteration of mobility by foam lamella blockage in a network of these spaces and channels of porous media. Saturation and relative permeability curves are obtained using well-known power-law expressions of percolation theory and a rescaling of the percolation parameter readily permits a number of lamella-blocking mechanisms to be treated. An explanation of the shift in breakthrough gas saturation and the deformation of the shape of permeabilityvs saturation curves upon introduction of foam is provided for a variety of blocking mechanisms. The qualitatively different features seen in experimental studies of modification of gas mobility by foam can be rationalized using only two parameters which characterize the throat-size at which blockage commences and the degree of blockage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01059631
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  • 3
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    Renormalization calculations of immiscible flow (1993)
    Springer
    Details
    Publication Date: 1993-09-01
    Print ISSN: 0169-3913
    Electronic ISSN: 1573-1634
    Topics: Geosciences , Technology
    Published by Springer
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  • 4
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    Fluid topology for invasion percolation in 3-D lattices (1993)
    Springer
    Details
    Publication Date: 1993-03-01
    Print ISSN: 0169-3913
    Electronic ISSN: 1573-1634
    Topics: Geosciences , Technology
    Published by Springer
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  • 5
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    Fluid percolation in bond-site size-correlated three-dimensional networks (1990)
    Springer
    Details
    Publication Date: 1990-08-01
    Print ISSN: 0169-3913
    Electronic ISSN: 1573-1634
    Topics: Geosciences , Technology
    Published by Springer
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  • 6
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    Beyond Anisotropy: Examining Non-Darcy Flow in Asymmetric Porous Media (2009)
    Springer
    Details
    Publication Date: 2009-12-24
    Print ISSN: 0169-3913
    Electronic ISSN: 1573-1634
    Topics: Geosciences , Technology
    Published by Springer
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  • 7
    Electronic Resource
    Electronic Resource
    Fluid topology for invasion percolation in 3-D lattices (1993)
    Springer
    Transport in porous media 10 (1993), S. 221-234 
    Details
    ISSN: 1573-1634
    Keywords: Two-phase flow ; percolation ; fluid topology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract A computer algorithm for the displacement of one fluid by another in three-dimensional pore-throat network models of porous media allows the determination of fluid characteristics and distributions at any point in the displacement process. The flowing fluids are found to form two closely intertwined networks with very few regions of space containing only one fluid. Further, the fraction of dead-end invader, i.e. the ratio of the fraction of nonflowing to flowing pores is essentially constant throughout a process. The dendritic character of trapped, i.e. disconnected fluid is dependent on the degree of pore-throat correlation in the network. As a result, a given pore filled with one of the fluids is likely to have at least one neighbor filled with another fluid. Our observations imply that (1) fillable pores are very likely to be filled, and (2) clusters are not compact. The latter provides a ready explanation for the ease with which so-called oil ganglia are broken up rather than moved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616810
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  • 8
    Electronic Resource
    Electronic Resource
    Renormalization calculations of immiscible flow (1993)
    Springer
    Transport in porous media 12 (1993), S. 237-260 
    Details
    ISSN: 1573-1634
    Keywords: Effective properties ; relative permeability ; pseudoization ; rescaling ; heterogeneity ; simulation ; reservoir characterization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract Oil reservoir properties can vary over a wide range of length scales. Reservoir simulation of the fluid flow uses numerical grid blocks have typical lengths of hundreds of metres. We need to specify meaningful values to put into reservoir engineering calculations given the large number of heterogeneities that they have to encompass. This process of rescaling data results in the calculation of ‘effective’ or ‘pseudo’ rock properties. That is a property for use on the large scale incorporating the many heterogeneities measured on smaller scales. For single phase flow, a variety of techniques have been tried in the past. These range from very simple statistical estimates to detailed numerical simulation. Unfortunately, the simple estimates tend to be inaccurate in real applications and the numerical simulation can be computationally expensive if not impossible for very fine grid representations of the reservoir. Likewise, pseudorelative permeabilities are time consuming to generate and often inaccurate. Real-space renormalization is an alternative technique which has been found to be computationally efficient and accurate when applied to single-phase flow. This approach solves the problem regionally rather than trying to solve the whole problem in one simulation. The effective properties of small regions are first calculated and then placed on a coarse grid. The grid is further coarsened and the process repeated until a single effective property has been calculated. This has enabled calculation of effective permeability of extremely large grids to be performed, up to 540 million grid blocks in one application. This paper extends the renormalization technique to two-phase fluid flow and shows that the method is at least 100 times faster than conventional pseudoization techniques. We compare the results with high resolution numerical simulation and conventional pseudoization methods for three different permeability models. We show that renormalization is as accurate as the conventional methods when used to predict oil recovery from heterogeneous systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624460
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  • 9
    Electronic Resource
    Electronic Resource
    Fluid percolation in bond-site size-correlated three-dimensional networks (1990)
    Springer
    Transport in porous media 5 (1990), S. 421-428 
    Details
    ISSN: 1573-1634
    Keywords: Fluid percolation ; bond problem ; bond-site correlated network ; percolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract A treatment of sites appropriate to fluid percolation in bond controlled processes results in sensitivity of breakup of the defender to the degree of size-correlation for three-dimensional networks. In strongly correlated lattices network control of invasion yields to a statistical treatment as a result of improved accessibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01141994
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  • 10
    Electronic Resource
    Electronic Resource
    Deposition of cellular fibronectin and desorption of human serum albumin during adhesion and spreading of human endothelial cells on polymers (1991)
    Springer
    Journal of materials science 2 (1991), S. 227-233 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract More insight into the mechanism of adhesion of human endothelial cells (HEC) on to polymeric surfaces may lead to the development of improved small-diameter vascular grafts. HEC suspended in 20% human serum-containing culture medium adhere and spread well on moderately water-wettable polymers such as tissue culture polystyrene (TCPS). Earlier it was demonstrated that during adhesion and spreading of HEC on TCPS, cellular fibronectin is deposited on to this surface. It was postulated that fibronectin deposition is accompanied by desorption of adsorbed serum proteins, e.g. human serum albumin (HSA). The amounts of adsorbed (cellular) fibronectin and HSA on TCPS surfaces pretreated for 1 h with solutions of human serum (ranging from 0.01%–20%), were determined after incubation of these surfaces for 6 h with HEC in culture medium and after incubation with culture medium without cells. Protein adsorption was determined by means of a two-step enzyme-immunoassay (EIA). HEC adhesion and spreading on TCPS resulted in a significant deposition of fibronectin irrespective of the serum concentration in the solution used for the pretreatment of TCPS. The deposition of cellular fibronectin on to TCPS, pretreated with human serum, was accompanied by displacement of adsorbed HSA. Desorption of HSA from TCPS was only detectable with the EIA at serum concentrations ranging from 0.01%–1%. Using131-l-labelled HSA as tracer protein; it could, however, be demonstrated that HSA was also displaced from TCPS, pretreated with solutions of higher serum concentrations. Pretreatment of the hydrophobic vascular graft material PET (poly(ethylene terephthalate); Dacron) and of FEP (fluoroethylenepropylene copolymer; a Teflon-like polymer) with a solution containing 20% human serum resulted in a reduced adhesion of HEC compared to uncoated surfaces. We suggest that this may be caused by a poor displacement of adsorbed serum proteins from these hydrophobic surfaces by cellular fibronectin. This may explain why HEC normally fail to adhere on to prosthetic surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703376
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