A New Stream-Tube Model for Waterflooding Performance in 5-Spot Patterns


By Noaman A.F. El-Khatib.


A new mathematical model is developed for waterflooding performance calculation in 5-spot pattern reservoirs using stream tubes. The method is based on estimating the location of the displacement front in any stream tubes relative to the location in any other tube at the same real time. Areal sweep efficiency, fractional oil recovery, fractional water flow and the injectivity ratio are calculated as functions of thetotal injected P.V. of the displacing fluid. The effect of mobility ratio on the performance is investigated. Comparison is also made between the performance obtained assuming piston-like displacement and that assuming Buckley-Leverett frontal advance theory.


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