Production EngineeringHydraulic Fracturing
Hydraulic Fracture Efficiency from Saydam Leakoff Function Formula
Hydraulic Fracture Efficiency from Saydam Leakoff Function calculates hydraulic fracture efficiency for hydraulic fracturing workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (C_L, t, W_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, eta_pct equals 39.998415 percent.
C_Lm/sqrt(min)
0.0004
tmin
60
W_fm
0.006
Inputs
C_L
m/sqrt(min)Fracture Fluid Leakoff Coefficient
t
minInjection Time
W_f
mFracture Width
Outputs
eta_pct
percent
Hydraulic Fracture Efficiency
eta_frac
fraction
Hydraulic Fracture Efficiency Fraction
x_D
dimensionless
Saydam Leakoff Parameter
F_L
dimensionless
Saydam Leakoff Function
Source and review
reviewedPrinciples of Hydraulic Fracturing, Saydam, T. (1967)
Saydam, T. 1967. Principles of Hydraulic Fracturing, ARI Publishing Co., Page 23.
source conflict
Source