Gas Flow Rate into the Wellbore Formula
Gas Flow Rate into the Wellbore calculates gas flow rate into the wellbore for well performance workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k, dP, L, u, R_e, R_w) are known and the assumptions behind the cited well performance 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, Q equals 74.908686 bbl/min.
100
500
50
0.02
1000
0.3
Inputs
k
mDPermeability
dP
psiPressure Differential
L
ftLength of Section Open to Wellbore
u
cPIntruding Gas Viscosity
R_e
ftDrainage Radius
R_w
ftWellbore Radius
Outputs
Q
Gas Flow Rate into the Wellbore
k
Permeability
dP
Pressure Differential
L
Length of Section Open to Wellbore
u
Intruding Gas Viscosity
Source and review
reviewedFormulas and Calculations for Drilling, Production and Workover, Lapeyrouse, N. J. (2002)
Lapeyrouse, N. J. 2002. Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page 136.
Source