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Drilling EngineeringWell ControlCalculation record

Bullheading Formation Fracture Pressure from Gradient Calculator

Pfrac=GfracTVDperfP_{frac}=G_{frac}TVD_{perf}

Enter the declared drilling engineering inputs below to solve P_frac. Variable definitions, units, the default calculation, and the available source trail are included on this page.

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Inputs

Defaults provide a quick field-unit example for the equation.

2 variables

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Extended guidance in preparation

What is available in this record

This record provides the functioning calculator, formula, declared variables and units, a reproducible default result, and the available citation metadata. A separately written engineering interpretation has not yet been published for this calculation.

Formula reference

Formula, variables, and default calculation

Pfrac=GfracTVDperfP_{frac}=G_{frac}TVD_{perf}

Reproducible default result

With the default values shown below, the calculation returns P_frac = 6,400 psi. Defaults demonstrate the implementation; they are not recommended field values.

G_fracpsi/ft

0.8

TVD_perfft

8000

Input definitions

G_frac

psi/ft

Formation Fracture Gradient

TVD_perf

ft

Top Perforations True Vertical Depth

Output definitions

P_frac

psi

Formation Fracture Pressure

G_frac

psi/ft

Formation Fracture Gradient

TVD_perf

ft

Top Perforations True Vertical Depth

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.

reviewed

IADC WellSharp Formula Sheet, field units, well completion/workover bullheading formulae.

Open source reference