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Index Terms Links

Underbalanced drilling (UBD) systems (Cont.)
deployment valves 171 171
downhole equipment 170 171

fluids used in 167 173
foam 167
defoaming of 229
formulations of 223
maximum depth for 228
model of 184
recycling system 169 170 229

returned foam 169 229
separation system 169 170
stability control 224
viscosity determinations 184
gas–liquid flow in 174 175
Hagedorn–Brown separated flow model 189

mud motors 170
multiphase flows in 173
annular flow 174
bubble flow 174 177
churn flow 174
friction factor for 179
gravity effects on 174

homogeneous models 176
liquid holdups 174
mist flow 174
models of 176
regimes 174 175

single-phase flow versus 174
slug flow 174

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