Well Flowing Pressure Line-Source Solution by Including Skin Factor Formula
Well Flowing Pressure Line-Source Solution by Including Skin Factor calculates well flowing pressure for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (P_i, q, mu, B, k, h, phi, c_t, r, t, S) 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, P_wf equals 3,430.696308 psi.
3500
500
2
1.2
100
50
0.2
0.00001
1000
10
3
Inputs
P_i
psiInitial Reservoir Pressure
q
bbl/dayFlow Rate
mu
cPViscosity
B
bbl/STBFormation Volume Factor
k
mDPermeability
h
ftPayzone Thickness
phi
fractionPorosity
c_t
1/psiTotal Compressibility
r
ftReservoir Radius
t
daysTime
S
dimensionlessSkin Factor
Outputs
P_wf
Well Flowing Pressure
S
Skin Factor
P_i
Initial Reservoir Pressure
Source and review
reviewedLee, J., Rollins, J.B. and Spivey, J.P. 2003. Pressure Transient Testing, Vol. 9, Society of Petroleum Engineers, Page 13.
Source