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Index Terms Links
Underbalanced drilling (UBD) systems (Cont.)
single-phase flow 174
snubbing units 169
surface equipment used in 167 168
uses of 195
V
Vacuum degasser 13 13
Velocity
effective annular 50
nozzle 52
terminal 128
terminal slip 54
transport 56
Vertical holes, gas flow in 120
Viscosity
foam 184
Newtonian fluids 24 62
Volumetric air flow rate intake 135
Vortex finder 16 17
W
Water removal 153
Water vapor saturation pressure 137
Water-gas interfacial tension 153
Weight on the bit (WOB) 160
Wellbore
configuration of 100 100
washout of 159
Weymouth’s friction factor 123
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