Given:
depth of the hole = 6000 ft (5500 ft drill pipe, 500 ft drill collars)
diameter of the hole = 8.75"
drill pipe = 4.5" oD, 16.6 lb/ft (3.826" lD)
drill collars = 6.75" OD, 2.813" lD
mud properties :
plastic fluid with p=70Ib/gal,
viscosity=30 cp,
tao(shear stress)=7.5lbfl(l00 sq ft)
recommended upward flow velocity in the annulus around the drill pipe = 120 ft/min
Find dynamic pressure drop in the flow inside the pipe and collars?