Dimensionless Buildup Pressure for Liquid Flow Formula
Dimensionless Buildup Pressure for Liquid Flow calculates dimensionless buildup pressure for pressure transient analysis workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k, h, P_i, P_ws, v_sc, q, B, mu) 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, P_Ds equals 364.856976 dimensionless.
0.1
100
3000
2500
1
50
1.2
0.5
Inputs
k
DEffective Permeability of Flowing Phase
h
mNet Formation Thickness
P_i
psiInitial Reservoir Pressure
P_ws
psiShut-In Pressure
v_sc
cc/gSpecific Volume at Standard Conditions
q
ton/hProduction Rate
B
reservoir volume/standard volumeFormation Volume Factor
mu
cPViscosity of Flowing Fluid
Outputs
P_Ds
Dimensionless Buildup Pressure
k
Effective Permeability of Flowing Phase
h
Net Formation Thickness
P_i
Initial Reservoir Pressure
P_ws
Shut-In Pressure
v_sc
Specific Volume at Standard Conditions
q
Production Rate
B
Formation Volume Factor
mu
Viscosity of Flowing Fluid
Source and review
reviewedRamey Jr., H.J. 1981. Reservoir Engineering Assessment of Geothermal Systems, Stanford University, Page 5.7.
Source