Hydrocarbon Pore Volume Occupied by Evolved Solution Gas Formula
Hydrocarbon Pore Volume Occupied by Evolved Solution Gas calculates hydrocarbon pore volume occupied by evolved solution gas for material balance and production workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (N, N_p, R_si, R_s, R_p, B_g) 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, V_g_ev equals 800,000 bbl.
1000000
100000
600
400
800
0.005
Inputs
N
STBInitial Oil in Place
N_p
STBCumulative Oil Production
R_si
SCF/STBInitial Solution Gas-Oil Ratio
R_s
SCF/STBCurrent Solution Gas-Oil Ratio
R_p
SCF/STBNet Cumulative Produced Gas-Oil Ratio
B_g
bbl/SCFCurrent Gas Formation Volume Factor
Outputs
V_g_ev
Hydrocarbon Pore Volume Occupied by Evolved Solution Gas
B_g
Current Gas Formation Volume Factor
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 4, Page 301.
Source