Carter Dimensionless Drawdown Correlating Parameter Formula
Carter Dimensionless Drawdown Correlating Parameter calculates carter dimensionless drawdown correlating parameter for pressure transient analysis workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (mu_gi, c_gi, mu_gavg, c_gavg) are known and the assumptions behind the cited pressure transient analysis 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, lambda_C equals 1.066667 dimensionless.
0.02
0.0004
0.025
0.0003
Inputs
mu_gi
cPInitial Gas Viscosity
c_gi
1/psiInitial Gas Compressibility
mu_gavg
cPAverage Gas Viscosity
c_gavg
1/psiAverage Gas Compressibility
Outputs
lambda_C
Carter Dimensionless Drawdown Correlating Parameter
mu_gi
Initial Gas Viscosity
c_gi
Initial Gas Compressibility
mu_gavg
Average Gas Viscosity
c_gavg
Average Gas Compressibility
Source and review
reviewedAhmed, T. and McKinney, P. D. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 3, Page 256.
Source