Production EngineeringHydraulic Fracturing
Average Permeability of Hydraulically Fractured Formation Formula
Average Permeability of Hydraulically Fractured Formation calculates average permeability of the hydraulically fractured formation for hydraulic fracturing workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (k_avgz, k, r_e, r_w, r_f) 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, k_avg equals 22.441467 mD.
k_avgzmD
100
kmD
10
r_ein
1000
r_win
4
r_fin
120
Inputs
k_avgz
mDAverage Permeability of the Hydraulically Fractured Zone
k
mDFormation Permeability
r_e
inDrainage Radius
r_w
inWell Radius
r_f
inFracture Radius
Outputs
k_avg
mD
Average Permeability of the Hydraulically Fractured Formation
Source and review
reviewedSaydam, T. 1967. Principles of Hydraulic Fracturing. ARI Publishing Co., Page 7.
Source