4.54 Calculate the equivalent density below the bottom joint of 10,000 ft of 7-in. casing being...

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4.54 Calculate the equivalent density below the bottom joint of 10,000 ft of 7-in. casing being lowered at a rate of 3 ft/s in an 8.5-in. hole. Assume that the bottom of the casing string is closed and that the mud has a density of 13 lbm/gal, a plastic viscosity of 28 cp, and a yield point of 9 lbf/100 sq fi. 4.54 Calculate the equivalent density below the bottom joint of 10,000 ft of 7-in. casing being lowered at a rate of 3 ft/s in an 8.5-in. hole. Assume that the bottom of the casing string is closed and that the mud has a density of 13 lbm/gal, a plastic viscosity of 28 cp, and a yield point of 9 lbf/100 sq fi.