4. (30 points) 6,000 ft of 7-in C-75 grade of casing string will be run in a borehole having a diameter of 8.5-in. The casing has a unit weight of 38 lbm/ft and a wall thickness of 0.540-in. Mud weight used to run the casing into the borehole is 10 lbm/gal (ppg). a) Calculate the weight of casing string in the air. b) Calculate the hook load when the casing is in the borehole. c) Calculate the borehole capacity in terms of bbl/ft. d) Calculate the borehole capacity in terms of bbl. e) Calculate the displacement of the casing in terms of bbl/ft. Class G cement will be used for cementing the string given in Problem 4. The cement slurry will be prepared by mixing the cement with 10% of bentonite and 5% of sodium chloride by weight of cement (BWOC). a) Calculate the yield of slurry in terms of cu ft/sack of cement. b) Calculate the density of the slurry in terms of lbm/gal. c) Calculate the number of sacks of cement that is required for the cement job.