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Permeable media

Siegrist RL, OR West, MI Morris, DA Pickering, DW Greene, CA Muhr, DD Davenport, JS Gierke (1995) In situ mixed region vapor stripping in low-permeability media. 2. Pull-scale field experiments. Environ Sci Technol 29 2198-2207. [Pg.618]

In this chapter, we describe the approaches used to mathematically model the flow of immiscible fluid phases through permeable media. We summarize the elements of system and parameter identification, and then describe our methods for determining properties of heterogeneous permeable media. [Pg.360]

Specific situations are simulated by solving the set of system equations [i.e., Eqs. (4.1.1 and 4.1.2) or (4.1.3-4.1.6)] with pertinent boundary and initial conditions, fluid properties and macroscopic properties. Fluid properties are generally readily obtained. Consider now the media properties, specifically the porosity and permeability, which are required for simulating all flows through permeable media. [Pg.361]

The lack of a method to determine the spatial distributions of permeability has severely limited our ability to understand and mathematically describe complex processes within permeable media. Even the degree of variation of intrinsic permeability that might be encountered in naturally occurring permeable media is unknown. Samples with permeability variations will exhibit spatial variations in fluid velocity. Such variations may significantly affect associated physical phenomena, such as biological activity, dispersion and colloidal transport. Spatial variations in the porosity and permeability, if not taken into account, can adversely affect the determination of any associated properties, including multiphase flow functions [16]. [Pg.369]

We have developed a method to spatially resolve permeability distributions. We use MRI to determine spatially resolved velocity distributions, and solve an associated system and parameter identification problem to determine the permeability distribution. Not only is such information essential for investigating complex processes within permeable media, it can provide the means for determining improved correlations for predicting permeability from other measurements, such as porosity and NMR relaxation [17-19]. [Pg.369]

Relative permeability and capillary pressure functions, collectively called multiphase flow functions, are required to describe the flow of two or more fluid phases through permeable media. These functions primarily depend on fluid saturation, although they also depend on the direction of saturation change, and in the case of relative permeabilities, the capillary number (or ratio of capillary forces to viscous forces). Dynamic experiments are used to determine these properties [32]. [Pg.375]

Spatially resolved, non-invasive NMR measurements within permeable media provide an unprecedented opportunity to extend the means for describing and... [Pg.381]

Propagation of enhanced oil recovery chemicals through rock is critical to the success of an EOR project. Polymer retention in permeable media has been the subject of considerable study (349)... [Pg.37]

It is now possible to explain the origin of a critical capillary pressure for the existence of foam in a porous medium. For strongly water-wet permeable media, the aqueous phase is everywhere contiguous via liquid films and channels (see Figure 1). Hence, the local capillary pressure exerted at the Plateau borders of the foam lamellae is approximately equal to the mean capillary pressure of the medium. Consider now a relatively dry medium for which the corresponding capillary pressure in a... [Pg.465]

Since, in general, lower permeability media exhibit higher capillary-pressure suction, we argue that it is more difficult to stabilize foam when the permeability is low. Indeed the concept of a critical capillary pressure for foam longevity can be translated into a critical permeability through use of the universal Leverett capillary-pressure J-function (.13) and, by way of example, the constant-charge model in Equation 2 for II ... [Pg.466]

Novak CF, Lake LW (1989) Diffusion and solid dissolution/precipitation in permeable media. AIChE 135 1057-1072... [Pg.399]

Equation 6 has two limiting cases which provide a basis for classifying displacements and permeable media. If the correlation length is small Equation 6 becomes... [Pg.63]

Foam exhibits higher apparent viscosity and lower mobility within permeable media than do its separate constituents.(1-3) This lower mobility can be attained by the presence of less than 0.1% surfactant in the aqueous fluid being injected.(4) The foaming properties of surfactants and other properties relevant to surfactant performance in enhanced oil recovery (EOR) processes are dependent upon surfactant chemical structure. Alcohol ethoxylates and alcohol ethoxylate derivatives were chosen to study techniques of relating surfactant performance parameters to chemical structure. These classes of surfactants have been evaluated as mobility control agents in laboratory studies (see references 5 and 6 and references therein). One member of this class of surfactants has been used in three field trials.(7-9) These particular surfactants have well defined structures and chemical structure variables can be assigned numerical values. Commercial products can be manufactured in relatively high purity. [Pg.181]

The limitation of the use of one atmosphere foaming experiments to rank order the predicted surfactant performance in permeable media rather than in quantitatively or semi-quantitatively predicting the actual performance of the surfactants under realistic use conditions has already been mentioned. Multiple correlation analysis has its greatest value to predicting the rank order of surfactant performance or the relative value of a physical property parameter. Correlation coefficients less than 0.99 generally do not allow the quantitative prediction of the value of a performance parameter for a surfactant yet to be evaluated or even synthesized. Despite these limitations, multiple correlation analysis can be valuable, increasing the understanding of the effect of chemical structure variables on surfactant physical property and performance parameters. [Pg.203]

The liquid saturations in foam flow are typically close to irreducible liquid saturation. As a result, the liquid saturation in a foam filled medium is generally not a good measure of the quality of the in situ foam, but rather the fraction of pore segments completely filled with liquid. More permeable media, such as unconsolidated media, generally have smaller residual liquid saturations (32,33) and thus tend to have higher gas saturations when foam is flowing. [Pg.321]

Chuoke, R.L., van Meurs, P., and van der Poel, C. "The Instability of Slow, Immiscible, Liquid-Liquid Displacements in Permeable Media," Petr. Trans. AIME 21fii (1959), 188. [Pg.373]

Local groundwater flow conditions of importance in petroleum-related studies may also deviate from the general assumptions underlying the Laplace and diffusion equations, e.g. chemical and electrical gradients may influence the flow through low-permeable media (e.g. Neuzil, 1986). [Pg.12]

The creeping flow of a single fluid phase through a stationary permeable media is the most basic physical situation of interest. In this case, the volume-averaged overall mass balance yields the equation of continuity 3... [Pg.114]


See other pages where Permeable media is mentioned: [Pg.399]    [Pg.359]    [Pg.359]    [Pg.359]    [Pg.360]    [Pg.361]    [Pg.362]    [Pg.363]    [Pg.364]    [Pg.365]    [Pg.367]    [Pg.369]    [Pg.369]    [Pg.371]    [Pg.373]    [Pg.375]    [Pg.377]    [Pg.379]    [Pg.381]    [Pg.382]    [Pg.466]    [Pg.496]    [Pg.159]    [Pg.286]    [Pg.374]    [Pg.69]    [Pg.72]    [Pg.1760]    [Pg.12]    [Pg.114]   
See also in sourсe #XX -- [ Pg.359 ]




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