Well calculator — hydrostatic, BHT & depth profile

Enter the well basics on the left. Results update live with each calculation step shown so you can audit the math for your own wells.

Well inputs

Units shown in brackets follow the active system (Field). Toggle in the header.

True vertical depth [ft]

100 – 40,000 ft

Fluid density / mud weight [ppg]

8.0 – 20.0 ppg

Surface temperature [°F]

−40 – 150 °F

Geothermal gradient [°F/1000 ft]

Max 5.0 °F/1000 ft

Surface pressure [psi]

Wellhead injection / annulus pressure (0 if none)

Friction & ECD inputs

Annular Bingham-plastic model. Inputs stay in field units (industry standard for mud hydraulics).

Flow rate [gpm]

0 – 2,000 gpm

Hole / casing ID [in]

Annular outer diameter

Pipe / DP OD [in]

Annular inner diameter (must be < hole ID)

Plastic viscosity (PV) [cP]

From rheology: PV = θ600 − θ300

Yield point (YP) [lb/100ft²]

From rheology: YP = θ300 − PV

Fix the highlighted inputs to see results.