Calculate the original oil in place (OOIP) of an oil reservoir if the drainage a

Question

Calculate the original oil in place (OOIP) of an oil reservoir if the drainage area = 1600 acres,
thickness=30 ft, porosity=0.3 and Sw=0.2 at the initial reservoir pressure = 4000 psi.
Note that the reservoir bubble point pressure is 3000 psi.
Your answer should be in [reservoir barrels] or [rb].

The oil formation volume factor at 4000 psi is 1.5 rb/stb. Calculate the amount of oil
produced at the stock tank condition, if 15% of the reservoir oil is produced and there is no
significant change in reservoir pressure.
Your answer should be in [stock tank barrels] or [stb].

Explanation / Answer

Oil in place is typically called STOOIP or Stock Tank Original Oil In Place is calculated by multiplying 7758 * rock volume * Fluid-filled porosity of the rock* 1-Water saturation - water-filled portion of this porosity all together then dividing it all up by the Formation volume factor

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