Correction Factor – Hammerlindl Formula
Correction Factor – Hammerlindl calculates compressibility drive index for unconventional reservoirs workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (G, E_fw, G_p, B_g) 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, CDI equals 40 dimensionless.
10000
0.02
1000
0.005
Inputs
G
MSCFGas in Place
E_fw
bbl/MSCFRock and Water Expansion Term
G_p
MSCFGas Produced
B_g
bbl/MSCFGas Formation Volume Factor
Outputs
CDI
Compressibility Drive Index
G
Gas in Place (rearranged)
E_fw
Rock and Water Expansion Term (rearranged)
G_p
Gas Produced (rearranged)
B_g
Gas Formation Volume Factor (rearranged)
Source and review
reviewedAhmed, T., McKinney, P.D. (2005). Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3, Page: 211.
Source