Reservoir EngineeringUnconventional Reservoirs
Adsorbed Gas Recovery Factor from Langmuir Pressures Formula
Adsorbed Gas Recovery Factor from Langmuir Pressures calculates adsorbed gas recovery factor for unconventional reservoirs workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (P_i, P_ab, P_L) 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, RF_ads equals 0.142857 fraction.
P_ipsi
1000
P_abpsi
500
P_Lpsi
200
Inputs
P_i
psiInitial Reservoir Pressure
P_ab
psiAbandonment Reservoir Pressure
P_L
psiLangmuir Pressure
Outputs
RF_ads
fraction
Adsorbed Gas Recovery Factor
P_i
psi
Initial Reservoir Pressure
P_ab
psi
Abandonment Reservoir Pressure
P_L
psi
Langmuir Pressure
Source and review
reviewedDerived from Ahmed and McKinney's Langmuir adsorption relationship for coalbed methane.
Source