Craig outlined guidelines for selecting the minimum number of layers needed to predict the performance of a reservoir under waterflooding operation. The author simulated the performance of a waterflood five-spot pattern that is composed of 100 layers with permeability variations ranging from 0.4 to 0.8. The minimum number of layers required to match results of the 100-layer model was determined as a function of mobility ratio and permeability variation.

 

His guidelines are the basis for this routine.

 

To calculate the minimum number of layers from Craig's data, simply enter the Dykstra-Parsons Permeability Variation, the Mobility Ratio and the WOR limit to be modelled, as shown below.

 

 

References:

Craig, Jr., F., "The Reservoir Engineering Aspects of Waterflooding", Society of Petroleum Engineers, 1971

 

 

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