PRESSURE LOSS CALCULATIONS IN DRILLING HYDRAULICS | BINGHAM PLASTIC & POWER LAW
Chapter II
Stand Pipe Pressure Or Pressure Loss (Friction Pressure) Calculations
Pumping a drilling fluid requires overcoming frictional drag forces from fluid layers and solids particles. The pump pressure (Pp) can be described as the summation of the frictional forces in the circulation system:
PP = PDS + PB + PA

Where:
PP : pump pressure, psi
PDS : drill string friction pressure, psi
PB : drilling bit pressure drop, psi
PA : annulus pressure, psi

The pressure drop in the bit results from
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