Production EngineeringHydraulic Fracturing
Productivity Ratio from Average Permeability - Hydraulic Fracturing Formula
Productivity Ratio from Average Permeability - Hydraulic Fracturing calculates productivity ratio for hydraulic fracturing workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (k_avg, k) are known and the assumptions behind the cited hydraulic fracturing 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, PR equals 2.5 dimensionless.
k_avgmD
25
kmD
10
Inputs
k_avg
mDAverage Permeability of Hydraulically Fractured Formation
k
mDFormation Permeability
Outputs
PR
dimensionless
Productivity Ratio
k_avg
mD
Average Permeability of Hydraulically Fractured Formation
k
mD
Formation Permeability
Source and review
reviewedSaydam, T. 1967. Principles of Hydraulic Fracturing. ARI Publishing Co., Page 7.
Source