Pore Volume Occupied by Injected Gas and Water Formula
Pore Volume Occupied by Injected Gas and Water calculates total pore volume occupied by injected fluids for material balance and production workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (W_INJ, B_w, G_INJ, B_GINJ) 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_t equals 302,000 bbl.
100000
1.02
50000000
0.004
Inputs
W_INJ
STBCumulative Water Injected
B_w
bbl/STBWater Formation Volume Factor
G_INJ
SCFCumulative Gas Injected
B_GINJ
bbl/SCFInjected Gas Formation Volume Factor
Outputs
V_t
Total Pore Volume Occupied by Injected Fluids
W_INJ
Cumulative Water Injected
B_w
Water Formation Volume Factor
G_INJ
Cumulative Gas Injected
B_GINJ
Injected 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 302.
Source