Apparent Sorption Compressibility Formula
Apparent Sorption Compressibility calculates apparent sorption compressibility for unconventional reservoirs workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (B_g, V_L, rho_B, b_L, phi, p) are known and the assumptions behind the cited unconventional reservoirs 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_s equals 0.000596 1/psi.
0.005
600
1.5
0.02
0.06
1000
Inputs
B_g
bbl/SCFGas Formation Volume Factor
V_L
SCF/tonLangmuir Volume Constant
rho_B
g/cm^3Bulk Density of Coal Deposit
b_L
1/psiLangmuir Pressure Coefficient
phi
fractionPorosity
p
psiReservoir Pressure
Outputs
c_s
Apparent Sorption Compressibility
B_g
Gas Formation Volume Factor
V_L
Langmuir Volume Constant
rho_B
Bulk Density of Coal Deposit
phi
Porosity
p
Reservoir Pressure
Source and review
reviewedAdvanced Reservoir Engineering, Ahmed, T., McKinney, P.D. (2005)
Ahmed, T. and McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 3, Page 222.