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7/25/2019 Chapter 5.1 Fluid Flow Through Bit Nozzle
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Chapter 5 Pressure Drop Across Drill Bit
PCB 4223 DRILLING HYDRAULICS SEPTEMBER 2015
BASED ON ASIF ZAMIR
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Learning Outcome:
Understand factors that influence pressure drop across
a nozzle
Understand and able to describe equations involved in
the calculation of pressure drop across a nozzle or
nozzle discharge velocity.
Able to apply equations for calculation of pressure drop
across brill bit or nozzle discharge velocity.
PCB 4223 DRILLING HYDRAULICS SEPTEMBER 2015
BASED ON ASIF ZAMIR
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Reference:
Chapter 4 Applied Drilling Engineering by
Adam T. Bourgoyne Jr.
PCB 4223 DRILLING HYDRAULICS SEPTEMBER 2015
BASED ON ASIF ZAMIR
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Drilling Hydraulics happens in Drilling Circulation System
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An important drilling hydraulics phenomena in the Drill Bit Nozzle:Fluid Pressure Energy is transformed into Kinetic Energy
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+ . + .
= + + + .
Usually neglect for they are relatively small:
Frictional pressure loss
Gravitational
Inlet and out let pressure loss
Simplified energy equation:
= + .
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Let = be the pressure drop across bit nozzle
Nozzle discharge velocity (approximate):
=
.
=
.
Corrected by a discharge coefficient = 0.95 ~0.98:
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The End of Presentation
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