Minimum Shut-In Time to Pseudosteady State for Hydraulically Fractured Tight Gas Reservoirs Formula
Minimum Shut-In Time to Pseudosteady State for Hydraulically Fractured Tight Gas Reservoirs calculates minimum shut-in time to reach pseudosteady state for pressure transient analysis workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (phi, mu_g, c_t, x_f, 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_pss equals 284.4 h.
0.08
0.02
0.000015
500
0.01
Inputs
phi
fractionPorosity
mu_g
cPGas viscosity
c_t
1/psiTotal compressibility
x_f
ftFracture half-length
k
mDPermeability
Outputs
t_pss
Minimum shut-in time to reach pseudosteady state
phi
Porosity
mu_g
Gas viscosity
c_t
Total compressibility
x_f
Fracture half-length
k
Permeability
Source and review
reviewedAhmed, T. and McKinney, P. D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 3, Page 23.
Source