Reservoir EngineeringUnconventional Reservoirs
Volume of Gas Adsorbed in Coalbed Methane Reservoirs Formula
Volume of Gas Adsorbed in Coalbed Methane Reservoirs calculates currently adsorbed gas volume for unconventional reservoirs workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (V_m, b, 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, V equals 571.428571 SCF/ton.
V_mSCF/ton
800
b1/psi
0.005
ppsi
500
Inputs
V_m
SCF/tonLangmuir Isotherm Volume Constant
b
1/psiLangmuir Pressure Constant
p
psiReservoir Pressure
Outputs
V
SCF/ton
Currently Adsorbed Gas Volume
V_m
SCF/ton
Langmuir Isotherm Volume Constant
b
1/psi
Langmuir Pressure Constant
p
psi
Reservoir Pressure
Source and review
reviewedAhmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 4, Page 320.
Source