Consider a well 12 inches in diameter. There are 1000 feet of 10x4 inch collars and 9000 feet of 5x4.26 inch drill pipe. The bit has 3 nozzles of diameter 13/32 inch. The surface piping has a pressure drop of 100 psi. The drilling mud is 12 lmb/gal with a viscosity of 10 cp. The circulating rate is 400 gal/min.
a)Calculate the v(ft/s), NRe, Turb/Laminar, ?P/?L(psi/ft) for inside the drillpipe, inside collar, outside drillpipe, outside collar
b)Calculate the drill bit pressure drop
c)Calculate the pressure at the bottom of the annulus and bottom of drillpipe.