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→Jet nozzle velocity
Jet nozzle velocity (JNV) is the velocity of the mud exiting the jet nozzles of the bit and is estimated as
Jet nozzle velocity (JNV) is the velocity of the mud exiting the jet nozzles of the bit and is estimated as
:<math>\mbox{JNV} = (0.32086 \times \mbox{GPM})/\mbox{An}</math>
:<math>\mbox{JNV} = \frac{0.32086 \times \mbox{GPM}}{\mbox{An}}</math>
''Example'': The jet nozzle velocity for a bit with three 13's jets installed and a circulation rate of 400 GPM is
''Example'': The jet nozzle velocity for a bit with three 13's jets installed and a circulation rate of 400 GPM is
:<math>\mbox{JNV} = (0.32086 \times 400)/0.3889 = 330 \mbox{ ft/sec}</math>
:<math>\mbox{JNV} = \frac{0.32086 \times 400}{0.3889} = 330 \mbox{ ft/sec}</math>
====Total hydraulic horsepower====
====Total hydraulic horsepower====
The total hydraulic horsepower (THhp) available for drilling hydraulics is defined by the circulation rate and pressure of the mud pump. Total hydraulic horsepower is calculated as
The total hydraulic horsepower (THhp) available for drilling hydraulics is defined by the circulation rate and pressure of the mud pump. Total hydraulic horsepower is calculated as
:<math>\mbox{THhp} = (\mbox{Pp} \times \mbox{GPM})/1714</math>
:<math>\mbox{THhp} = \frac{\mbox{Pp} \times \mbox{GPM}}{1714}</math>
'''''Example''''': The total hydraulic horsepower available if circulating at 400 gal/min with a pump pressure of 2000 psi is
'''''Example''''': The total hydraulic horsepower available if circulating at 400 gal/min with a pump pressure of 2000 psi is
:<math>\mbox{THhp} = (2000 \times 400)/1714 = 467 \mbox{ hp}</math>
:<math>\mbox{THhp} = \frac{2000 \times 400}{1714} = 467 \mbox{ hp}</math>
===Jet nozzle pressure loss===
===Jet nozzle pressure loss===