Experimental Determination of Relative Permeability Correlation for an Iranian Reservoir Field

One of the most important parameter in modeling of oil/gas reservoirs is a relative permeability concept. Relative Permeability is a function of wetting/non-wetting phase saturation distribution and the mineralogy of reservoir rock relative to the pore size distribution.Laboratory measurement of relative permeability using either steady-state or unsteady-state methods can be expensive and time consuming. Each method has certain advantages, resulting in preferences of one particular method over the other. The primary advantage of the unsteady-state method is that it is faster than the steady-state method.The main purpose of this paper, to measure experimentally the relative permeability of reservoir rock of an Iranian oil field by core flood apparatus.The brine saturated sample was then flooded with oil to establish the irreducible water saturation condition. Then the oil permeability to oil at irreducible water saturation was determined. The oil flooded samples were immediately flooded with brine. Oil and water1effluents to gather with time and pressure data were utilized for calculating Krw and Kro values which were then plotted as a function of water saturation.Also in this work a computer program has been developed by DELPHI. In this program relative permeability curves Krw, Kro vs. water saturation would be plotted and the (a) and (b) coefficients of below formula for different samples can be found by using radius of curvature method: bSwaeKKrwro−=. (1)Another feature of this program is finding unknown constants of (b, m) forKro = B*(1-Sww) m (2)and (a, n) forKrw= A*(Sww) n (3)by regression method.Finally a correlation was developed for an Iranian oil reservoir and the results are compared to available well known correlations and equations.

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Experimental Relative Permeability