Flow Period Duration for Hydraulically Fractured Wells Formula
Flow Period Duration for Hydraulically Fractured Wells calculates duration of flow period for pressure transient analysis workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (phi, mu, c_t, L_f, t_LfD, k) are known and the assumptions behind the cited pressure transient analysis 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, t_flow equals 85.324232 h.
0.12
1.5
0.00001
250
0.1
0.5
Inputs
phi
fractionPorosity
mu
cPViscosity
c_t
1/psiTotal Compressibility
L_f
ftFracture Length
t_LfD
dimensionlessDimensionless End-of-Linear-Flow Time
k
mDPermeability
Outputs
t_flow
Duration of Flow Period
phi
Porosity
mu
Viscosity
c_t
Total Compressibility
L_f
Fracture Length
t_LfD
Dimensionless End-of-Linear-Flow Time
k
Permeability
Source and review
reviewedPressure Transient Testing, Lee, J., Rollins, J.B., Spivey, J.P. (2003)
Lee, J., Rollins, J.B. and Spivey, J.P. 2003. Pressure Transient Testing, SPE Textbook Series Vol. 9, Page 115.
Source