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Steadystate upscaling techniques are quick and simple to implement. They are based on the assumption that either capillary forces (CEL)or viscous forces (VL) dominate flow. However, the reservoir conditions for whichthese assumptions are valid have not been clearly defined. We have used dimensional analysis to identify a comprehensive suite of dimensionlessgroups which can be used to define the validity of steadystate methods. The groupsaccount for the effect of heterogeneity, as well as the other parameters which controlthe balance between capillary and viscous forces. Numerical simulations have beenused to identify the range of values for these groups over which steadystate methodsare valid. Our results yield a practical set of quantitative criteria which can be used todetermine the validity of steadystate upscaling methods for a wide range of geologicalmodels.Our criteria demonstrate that steadystate methods can be valid over a broader rangeof flow rates and length scales than previously thought.
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