A 10,000-ft drilIstring is composed of 8,500 ft of 5-in., drilIpipe (ID = 4.276 in.), 1000 ft
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A 10,000-ft drilIstring is composed of 8,500 ft of 5-in., drilIpipe (ID = 4.276 in.), 1000 ft of 5 x 3 in. heavy weight drill pipe and 500 ft of 8 x 3 in. drilI colIar.
The previous casing shoe is at the depth of 7500 ft and has an ID of 10 ¾”. The bit diameter is 9 1/2” and has two #12 nozzles and one #13 nozzle.
An 11 ppg mud is circulated at 450 gpm, calculate the mud average velocity in the drillpipe, heavy weight drill pipe, drill collar, and bit nozzles. In addition, calculate the average mud velocity in the annulus apposite to each drillstring section.
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