Reservoir EngineeringUnconventional Reservoirs
Tight-Gas Compartment Underground Withdrawal Formula
Tight-Gas Compartment Underground Withdrawal calculates underground fluid withdrawal for unconventional reservoirs workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (G, E_g, W_e) are known and the assumptions behind the cited unconventional reservoirs 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, F equals 2,500 bbl.
GMSCF
100000
E_gbbl/MSCF
0.02
W_ebbl
500
Inputs
G
MSCFGas in Place
E_g
bbl/MSCFGas Expansion Term
W_e
bblCumulative Water Influx
Outputs
F
bbl
Underground Fluid Withdrawal
G
MSCF
Gas in Place
E_g
bbl/MSCF
Gas Expansion Term
W_e
bbl
Cumulative Water Influx
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 3, Page 209.
Source