Reservoir EngineeringUnconventional Reservoirs
Gas Solubility in Coalbed Methane Reservoirs Formula
Gas Solubility in Coalbed Methane Reservoirs calculates equivalent gas solubility for unconventional reservoirs workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (rho_B, phi_m, S_om, V) 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, R_s equals 766.71875 dimensionless.
rho_Bg/cc
1.4
phi_mfraction
0.02
S_omfraction
0.8
VSCF/STB
50
Inputs
rho_B
g/ccBulk Coal Seam Density
phi_m
fractionActual Coalbed Cleat Porosity
S_om
fractionInitial Oil Saturation Term
V
SCF/STBGas Content
Outputs
R_s
dimensionless
Equivalent Gas Solubility
rho_B
g/cc
Bulk Coal Seam Density
phi_m
fraction
Actual Coalbed Cleat Porosity
S_om
fraction
Initial Oil Saturation Term
V
SCF/STB
Gas Content
Source and review
reviewedAhmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 3, Page 222.
Source