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Line 316:
Line 316: − + − :<math>&= 188.5 \mbox{ ft/min}\\&\\\mbox{Collars: AV} &= (24.5 \times 400)/(8.5^{2} - 6.5^{2})\\&= 326.7 \mbox{ ft/min}</math>+
→Annular velocity: math
'''''Example''''': If mud is circulated at 400 gal/min in an 8.5-in. hole containing a 4.5-in. drill pipe and 6.5-in. collars, the annular velocities are
'''''Example''''': If mud is circulated at 400 gal/min in an 8.5-in. hole containing a 4.5-in. drill pipe and 6.5-in. collars, the annular velocities are
:<math>\mbox{Drill pipe: AV} = (24.5 \times 400)/(8.5^{2} - 4.5^{2})</math>
:<math>\mbox{Drill pipe: AV} = (24.5 \times 400)/(8.5^{2} - 4.5^{2}) = 188.5\mbox{ ft/min}</math>
:<math>\mbox{Collars: AV} = (24.5 \times 400)/(8.5^{2} - 6.5^{2}) = 326.7 \mbox{ ft/min}</math>
===Jet nozzle area===
===Jet nozzle area===