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Bullheading Maximum Initial Surface Pressure Calculator

Psurf,init,max=Pfrac−Ph,initP_{surf,init,max}=P_{frac}-P_{h,init}

Enter the declared drilling engineering inputs below to solve P_surf_init_max. 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

Psurf,init,max=Pfrac−Ph,initP_{surf,init,max}=P_{frac}-P_{h,init}

Reproducible default result

With the default values shown below, the calculation returns P_surf_init_max = 2,600 psi. Defaults demonstrate the implementation; they are not recommended field values.

P_fracpsi

6400

P_h_initpsi

3800

Input definitions

P_frac

psi

Formation Fracture Pressure

P_h_init

psi

Initial Hydrostatic Pressure

Output definitions

P_surf_init_max

psi

Maximum Initial Surface Pressure

P_frac

psi

Formation Fracture Pressure

P_h_init

psi

Initial Hydrostatic Pressure

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