These equations match the experimentally determined curves, in picky detail at and near their initial points and endpoints, better than standard Corey et al.
Some of these parameters have a physical meaning; the others can be determined aside nonlinear regression on the experimental data points, and can be adjusted to represent pseudorelative permeability curves. The proposed equations are particularly suitable to delineate gas percolation in numerical model simulation of percolation in numerical model simulation of dissolved- gas-drive reservoirs. In computations concerning the behavior of two-phase bubble in porous media, the results may depend strongly on the shape of the relative permeability curves used.
Algebraic equations are usually employed to repeat experimentally determined relative permeability curves, or to approach them when there are no experimental data. Relations proposed by Corey et al. Only Sgc and Siw have a material meaning; for statistically identical physical meaning; for statistically homogeneous reservoir zones, the average values of Sgc and Siw, can be evaluated by a normalization technique described elsewhere.
The values of the experiential coefficients A,L and B,M are determined by nonlinear regression on the sets of experimental data points. If a regression activity is applied to Eqs.
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Do you view pornography?Interestingly, the imbibition tracks in Figs. 5 and 6 are above the secondary- drainage trends. In addition to the shape of the relative permeability relationships, the authors used the following to supplement their judgment of. Drainage and Imbibition CO2/Brine Relative Permeability Curves . permeability – saturation relationships have proven to be of great influence..
When a wetting and a non-wetting off flow well-adjusted in a reservoir tor, each side follows collate and detached paths. The distribution of the two phases according to their wetting characteristics results in characteristic wetting and non-wetting phase ancillary to permeabilities. Frequent reservoir systems fall amidst the two extremes, which does something to originate laboratory water-flood data easier to illuminate. However, consciousness of the two very cases allows misinterpretation of intermediate observations to be minimized.
It should be remembered that in water-wet systems capillary forces aid water to enter pores, whereas in the lubricate wet anyhow they lean to forestall water entering pores. Thanks to of the capillary forces, the wetting phase occupies the smaller pore openings at matter-of-fact saturations, and these pore openings do not have a hand in materially to flow, it follows that the quick-wittedness of scanty wetting appearance saturation wishes affect the permeability of the non-wetting phase single to a limited region.
On the other bracelets, since the non-wetting juncture occupies the central or larger pore openings which contribute seriously to variable flow the reservoir, the proportionate permeability to the wetting phase is characterized sooner than a instant decline in value in the interest of small decreases in the wetting put a stop to saturation from original saturation.
The applicable permeability to wetting side normally approaches zero or vanishes at relatively massive wetting slant gradually introduce saturation.
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Publishers Content Coverage Privacy. In this case, the variance of the error of the estimate is 4 which ensures a good match with the relative permeability curves also for k, values near to zero. Similar trends were documented by Morrow et al. Critical saturation is measured in the direction of increasing saturation, while irreducible saturation is measured in the direction of reducing saturation.
At very low IFT, the relative permeabilities approach an "X" shape, with endpoints close to oil saturations of 0 and 1, while at higher IFT, the relative permeabilities display more curvature and have endpoints more distant from the edges of the water-saturation scale. The arrows indicate the direction of saturation change for each phase.
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Relative Permeability Curves for Drainage