Dimensionless Storage Constant for Liquid Buildup Tests Formula
Dimensionless Storage Constant for Liquid Buildup Tests calculates dimensionless storage constant for liquid for pressure transient analysis workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (C, B, V_sc, phi, h, c_t, r_w) 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, C_D equals 509.295818 dimensionless.
0.01
1.2
1
0.2
30
0.00001
0.25
Inputs
C
storage unitsLiquid Wellbore Storage Constant
B
reservoir volume/standard volumeFormation Volume Factor
V_sc
cc/gSpecific Volume at Standard Conditions
phi
fractionPorosity
h
mNet Formation Thickness
c_t
(kg/cm^2)^-1Total System Effective Compressibility
r_w
mWell Radius
Outputs
C_D
Dimensionless Storage Constant for Liquid
C
Liquid Wellbore Storage Constant
B
Formation Volume Factor
V_sc
Specific Volume at Standard Conditions
phi
Porosity
h
Net Formation Thickness
c_t
Total System Effective Compressibility
r_w
Well Radius
Source and review
reviewedReservoir Engineering Assessment of Geothermal Systems, Ramey Jr., H.J. (1981)
Ramey Jr., H.J. 1981. Reservoir Engineering Assessment of Geothermal Systems, Stanford University, Page 5.18.
Source