Treatment Fracture Gradient - Hydraulic Fracturing Calculator
Enter treatment pressure and depth inputs in the required units. The calculator returns treatment fracture gradient.
Calculation context and source notes
Treatment fracture gradient estimates the pressure gradient associated with hydraulic-fracturing treatment pressure at depth.
Use it for fracturing design screening, pressure-limit awareness, and comparisons with pore pressure, overburden, and wellbore constraints.
Solves for
G_f (psi/ft)
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Formula, variables, and sourceFormula, variables, and default calculation
Reproducible default result
With the default values shown below, the calculation returns G_f = 0.6875 psi/ft. Defaults demonstrate the implementation; they are not recommended field values.
3000
3500
800
200
8000
Input definitions
P_inj
psiInjection Pressure
DeltaP_h
psiHydrostatic Pressure Change
DeltaP_f
psiFriction Pressure Loss
DeltaP_p
psiPerforation Pressure Loss
D
ftDepth
Output definitions
G_f
Treatment Fracture Gradient
P_inj
Injection Pressure
DeltaP_h
Hydrostatic Pressure Change
DeltaP_f
Friction Pressure Loss
DeltaP_p
Perforation Pressure Loss
D
Depth
Engineering use, assumptions, and limits
Use it for fracturing design screening, pressure-limit awareness, and comparisons with pore pressure, overburden, and wellbore constraints.
Assumptions
- Treatment pressure is representative for the stage or interval being checked.
- Depth is the correct true vertical depth reference for gradient conversion.
- Surface pressure, hydrostatic head, and friction terms are handled consistently with the source equation.
Limitations
- Does not replace a hydraulic-fracture simulator, mini-frac interpretation, or well-integrity review.
- Does not capture stress contrast, leakoff, near-wellbore tortuosity, perforation friction, or proppant transport by itself.
Common mistakes
- Using measured depth instead of the TVD needed for gradient calculations.
- Mixing surface treating pressure with bottomhole treating pressure without the required corrections.
- Treating a pressure-gradient check as a complete frac design.
Source and record status
Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.
Saydam, T. 1967. Principles of Hydraulic Fracturing. ARI Publishing Co., Page 25.
Open source reference