Fracture calibration
Ready
Match modeled fracture geometry to DFIT / step-rate diagnostics.
- Inputs
- ISIP, closure pressure, leakoff, net pressure history
- Outputs
- Calibrated leakoff coefficient, closure stress, fluid efficiency
Wellbore Genius
Calibration studies
Pick the kind of measurement you have — fracture diagnostics, tracer arrivals, convection or flowback data — and the hub opens the right tool with your boundary conditions and recent runs already loaded. Familiar workflow:Pick study → Load data → Fit → Apply
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Fracture calibration
Match modeled fracture geometry to DFIT / step-rate diagnostics.
Quick DFIT calibration
Nolte fluid efficiencyPresetDisplay: Field (psi, ft)
Instantaneous Shut-In Pressure [psi]. Surface (or BHP-corrected) pressure recorded the instant pumps are shut down — before friction has bled off but after fluid motion has stopped. Drives net pressure: Pnet = ISIP − Pclosure.
Live (Field)
Pnet = 7800 psi − 6900 psi = 900 psiFracture closure pressure [psi] — the pressure at which the fracture mechanically closes on itself. Read from the inflection on a G-function or √t diagnostic plot. Equals minimum horizontal stress σh,min for an ideal DFIT.
σH,max ≥ σh,min = ≥ 6900 psi (needs frac-orientation log to pin)
Live (Field)
σh,min ≈ Pclosure = 6900 psiσH,max ≥ σh,min = ≥ 6900 psi (needs frac-orientation log to pin)
Pump time tp [min]. Total elapsed time from first injection to shut-in. Sets the reference clock for Nolte's G-function and shows up in the η denominator as 2·tp.
Live (Field)
2·tp = 2 × 8.0 min = 16.0 minClosure time tc [min]. Time measured from shut-in until the fracture closes (matches the G-function inflection). Larger tc ⇒ slower leakoff ⇒ higher fluid efficiency.
Live (Field)
δc = tc / tp = 22.0 min / 8.0 min = 2.750Total injected slurry volume [bbl] pumped during the DFIT. Splits into fracture volume Vf = η·Vinj and leakoff Vl = (1−η)·Vinj.
Vl = 0.421 × 50.0 bbl = 21.1 bbl
Live (Field)
Vf = 0.579 × 50.0 bbl = 28.9 bblVl = 0.421 × 50.0 bbl = 21.1 bbl
Results summary
- Net pressure
- 900 psi
- Closure ratio δc
- 2.75 —
- Fluid efficiency η
- 57.9 %
- Fracture volume
- 28.9 bbl
- Leakoff volume
- 21.1 bbl
Quick-look only — η uses the simplified Nolte form η = tc / (tc + 2·tp). For a full G-function fit open Fracture calibration below.
Sensitivity sweep
η · Vf · Vl vs tcSweep tc with tp held constant — η rises monotonically with tc.
1 min120 min
- tp [min]
- 8.0
- tc [min]
- 22.0
- Vinj [bbl]
- 50.0
Anchored at
Current operating point
tc = 22.0 min ⇒ η = 57.9 %, Vf = 28.9 bbl, Vl = 21.1 bbl
G-function diagnostic
P, dP/dG, G·dP/dG vs G(ΔtD)Synthetic Nolte G-function plot anchored to your ISIP, Pclosure, tp and tc. A straight G·dP/dG through the origin signals normal leakoff; departures suggest PDL (above the line), tip-extension (below), or height recession.
η sensitivity tornado
Δη [%] for ±20%Each bar shows how fluid efficiency η responds to a ±20% perturbation of one input while every other input is held at the calibration anchor. Bars sort by absolute swing — the top bar is the input you should measure most carefully.
Baseline η = 57.89 %
Step-down test— partition surface ΔP into perforation friction and near-wellbore tortuosity from a multi-rate step-down.
Tracer arrival times
Ready
Calibrate inter-well connectivity using tracer / chemical arrivals.
- Inputs
- Tracer concentration vs time at offset wells
- Outputs
- Best-fit fracture half-length, conductivity, breakthrough times
Convection calibration
Ready
Calibrate gravitational convection during shut-in.
- Inputs
- Density contrast, fracture geometry, shut-in duration
- Outputs
- Convective velocity, redistribution profile
Flowback calibration
Ready
Use early flowback to constrain near-wellbore conductivity.
- Inputs
- Choke schedule, rate, pressure, water cut
- Outputs
- Effective near-well permeability, cleanup efficiency
Ballistics fit
Ready
Fit a ballistic model to measured velocity / penetration data.
- Inputs
- CSV of measured shots (velocity, penetration, formulation)
- Outputs
- Best-fit formulation parameters + residual diagnostics
Boundary conditions
Ready
Set far-field stress / pressure boundaries used by every calibration.
- Inputs
- Min / max horizontal stress, pore pressure, gradient
- Outputs
- Boundary preset reused across all calibration runs