Confined & radial fracture geometry

Hydraulic fracture design, stage by stage.

FastFrac is hydraulic fracture design software for one stage of a frac treatment. Enter well completion, reservoir, rock-mechanics, fluid, proppant and pumping-schedule data. The engine works the job one stage at a time, solving fracture geometry by iterating between the Carter leakoff balance and the elastic width relation.

It returns the frac treatment design in full: rates, volumes, sand, surface pressure and hydraulic horsepower, alongside fracture half length, created width and the propped width each stage places. A geometry view then shows where every stage ends up in the fracture at the end of pumping, and how much of it is still there after leakoff.

Built for multi-stage horizontal and vertical wells in unconventional and conventional reservoirs. Every equation the model applies in hydraulic fracturing, with its published source, is set out on the Basis page inside the software. The design notes below work up complete frac designs for the Marcellus, Midland Basin Wolfcamp B and Haynesville, parameter by parameter.

How it works Design notes

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Treatment schedule for a Marcellus well, with propped fracture half length, fluid efficiency and pad remaining above a stage-by-stage table of time, rates, volumes, sand, surface pressure, hydraulic horsepower, fracture half length, created width and proppant fill.
The treatment schedule, stage by stage, with surface pressure and horsepower.
Confined PKN fracture geometry over a 350 ft height, showing where each stage of the treatment ends up at the end of pumping, shaded by sand concentration.
Where every stage ends up in the fracture at the end of pumping.
Fracture width profile comparing created width with propped width against distance from the wellbore.
Created width against the width the sand props.

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Geometry
Confined PKN fracture, switching to radial when containment height is set to zero.
Fluid model
Newtonian treatment fluid characterised by a single viscosity.
Leakoff
Carter balance with per-parcel tracking, so each stage's own losses are resolved.
Units
English engineering units throughout.