Oil in Place in Saturated Oil Reservoirs Formula
Oil in Place in Saturated Oil Reservoirs calculates oil in place for material balance and production workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (N_p, B_o, G_p, R_s, B_g, B_oi, R_si) are known and the assumptions behind the cited material balance and production relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, N equals 384,210.526316 STB.
100000
1.15
100000000
500
0.005
1.2
700
Inputs
N_p
STBCumulative Oil Production
B_o
bbl/STBOil Formation Volume Factor
G_p
SCFCumulative Gas Production
R_s
SCF/STBCurrent Gas Solubility
B_g
bbl/SCFGas Formation Volume Factor
B_oi
bbl/STBInitial Oil Formation Volume Factor
R_si
SCF/STBInitial Gas Solubility
Outputs
N
Oil in Place
G_p
Cumulative Gas Production
N_p
Cumulative Oil Production
Source and review
reviewedAdvanced Reservoir Engineering, Ahmed, T., McKinney, P. D. (2005)
Ahmed, T. and McKinney, P. D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 5, Page 334.
Source