Oil Saturation Below Bubble Point During Depletion Formula
Oil Saturation Below Bubble Point During Depletion calculates oil saturation for pvt and rock-fluid properties workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (S_wi, N_p, N, B_oi, B_o) are known and the assumptions behind the cited pvt and rock-fluid properties 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, S_o equals 0.552 fraction.
0.25
200000
1000000
1.25
1.15
Inputs
S_wi
fractionInitial Water Saturation
N_p
STBCumulative Oil Production
N
STBOil in Place
B_oi
bbl/STBInitial Oil Formation Volume Factor
B_o
bbl/STBOil Formation Volume Factor
Outputs
S_o
Oil Saturation
S_wi
Initial Water Saturation
N_p
Cumulative Oil Production
N
Oil in Place
B_o
Oil Formation Volume Factor
B_oi
Initial Oil Formation Volume Factor
Source and review
reviewedAhmed, T. and McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 4, Page 312.
Source