Waterflood has a whole chapter (14 WFL) in the Guidebook. There are a lot of "special" equations.
Yet many (even most) "waterflood" questions are just simple
reservoir volumetrics, so you never need to leave the 13 RES chapter.
But know the basic volume equations well, such as N = 7,758 Vb phi (1-Swi)/Boi. Note also that 1 - Swi can include 1 - Swi - Sgr - Sor.
A standard problem uses initial water saturation. More complex problems include residual gas and residual oil. For an example:
Vb = 1,400 acre-ft
Porosity = 20%
Swi = 25%, Sgr = 10%, & Sor = 30%
Bo = 1.3 RB/STB, Bw = 1 RB/STB
These are all typical values. Then calculate the max oil that can be removed from the reservoir, by waterflood or otherwise:
[7,758(1,400)0.2(1 - 0.25 - 0.1 - 0.3)]/1.3 = 580 MSTB
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