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Calculators

☰ View Formula

Flow Rate (gpm)

Hole Diameter (Outer Diameter)

Drillstring Diameter (Inner Diameter)

 

Annular Velocity (ft/min)

X
Annular velocity formula
☰ View Formula

Flow Rate (gpm)

Fluid Density (lb per gallon)

Nozzle Area (in2, If multiple nozzles, A = total area)

Coefficient of Nozzle (C is normally assumed to be .95)

 

Pressure Drop (psi) Across Rock Bit Nozzle:

X
Pressure drop formula
☰ View Formula

Cutting Speed

Rotary Speed (rpm)

Max. Blade OD (in)

 

Cutting Speed (ft/min):

Rotary Speed

Cutting Speed (ft/min)

Max. Blade OD (in)

 

Rotary Speed (rpm):

X
Cutting speed formula
☰ View Formula

Weight from Inside Diameter

Outside Diameter (in)

Inside Diameter (in)

 

Weight to Inside Diameter:

Inside Diameter from Weight

Weight (lb/ft)

Outside Diameter (in)

 

Inside Diameter to Weight:

X
Weight to ID formula

For Spiral Drill Collars use ~ 96% of calculated wt/ft.

☰ View Formula

Outer Diameter (in)

Inner Diameter (in)

 

Gallons per Linear Foot:

Linear Feet per Gallon:

Barrels per Linear Foot:

Linear Feet per Barrel:

X
Volume vs height formula
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