Production EngineeringWell Performance
Fuel Gas Wobbe Index Formula
Fuel Gas Wobbe Index calculates wobbe index for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (GHV, gamma_g) are known and the assumptions behind the cited well performance 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, W equals 1,302.364713 Btu/scf.
GHVBtu/scf
1050
gamma_gdimensionless
0.65
Inputs
GHV
Btu/scfGross Heating Value
gamma_g
dimensionlessGas Specific Gravity
Outputs
W
Btu/scf
Wobbe Index
GHV
Btu/scf
Gross Heating Value
gamma_g
dimensionless
Gas Specific Gravity
Source and review
reviewedGas Conditioning and Processing, Campbell, J. M. (1992)
John M. Campbell. 1992. Gas Conditioning and Processing, Campbell Petroleum Series, Vol. 1, Page 291.
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