![]() Some symbols and definitions used in describing relative permeability data are listed below: Relative permeability is the ratio of the permeability to a given fluid in the presence of other fluids to the absolute permeability (see Chapter 2). Several procedures exist for normalizing or averaging relative permeability data (see Schneider, 1987 Mattax and Dalton, 1990 Fanchi, 2000 Carlson, 2003). The set of relative permeability curves should be sorted by lithology and averaged to determine a representative set of curves for each rock type. Relative permeability data are often measured and reported for laboratory analysis of several core samples from one or more wells in a field. The permeability distribution and relative permeability curves used in reservoir engineering calculations need to reflect the type of processes that are expected to occur in the reservoir. Permeability measurements for a gasflood would not be consistent with the waterflood system. For example, if a waterflood is planned for an oil reservoir that is being depleted, laboratory measured permeabilities need to represent the injection of water into a core with reservoir oil and connate water. If the fluid system changes or the rock type changes, the appropriate values of permeability and relative permeability must be measured. ![]() Permeability and relative permeability describe flow of a particular fluid in a particular rock type. For example, water–oil imbibition curves are representative of waterflooding, while water–oil drainage curves describe the movement of oil into a water zone. Relative permeability data should be obtained using experiments that best model the type of displacement that is thought to dominate reservoir flow performance. Fanchi, in Integrated Reservoir Asset Management, 2010 10.6.8 Practical Notes ![]()
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