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Chapter from:
AAPG Memoir 71 : Reservoir Characterization-Recent Advances
Edited by Richard A. Schatzinger and John F. Jordan
Copyright 
1999 by The American Association of
Petroleum Geologists. All rights reserved.
Memoir 71, Chapter 21: Effect of Wettability on Scale-Up of Multiphase Flow From
Core-Scale to Reservoir Fine-Grid Scale , by Y. C. Chang, V. Mani, and K. K. Mohanty ,
Pages 305 - 318
Chapter 21
Effect of Wettability on Scale-Up of Multiphase
Flow From Core-Scale to Reservoir Fine-Grid Scale
Y. C. Chang
V. Mani
K. K. Mohanty
Department of Chemical Engineering
University of Houston
Houston, Texas, U.S.A.
ABSTRACT
Reservoir rocks modeled in typical field-scale simulation grids are internally
heterogeneous. The objective of this work is to study how rock wettability affects the
scale-up of multiphase flow properties from core-scale to fine-grid reservoir simulation
scale (~10 ft x 10 ft x 5 ft; 3 m x 3 m x 1.5 m). Upscaling from fine-grid reservoir
simulation scale to coarse-grid simulation scale is not addressed here. Heterogeneity is
modeled as a correlated random field, parameterized in terms of its variance and two-point
variogram. Variogram models of both finite (spherical) and infinite (fractal) correlation
lengths are included as special cases. Local core-scale porosity, permeability, capillary
pressure, relative permeability, and initial water saturation are assumed to be
correlated. Water injection is simulated; effective flow properties and flow equations are
calculated.
