1 Calculate the hydrostatic pressure at the bottom of the fluid column for each case shown. 11,000ft 10ppg mud t ID 10in 4,000 ID 3in (a) 40- (b) psi (c) psi psi Gravel Sp.gr -2.68 Porosity 25% 2,000ft A well has the following profile: Casing Drill string: Total depth 16,400' (vertical well) 16" Open Hole, Surface casing 13 3/8" OD and 12 3/7" ID of 68.00 lb/ft set at 2000'. 12.5" Open Hole, Intermediate Casing 9 5/8"OD and ID of 8 2/3", 47 lb/ft, set at 8,458" 8.5" Open Hole, Drilling liner 7" (6" ID) (Grade N-80) interval between 8,400 to 14,200' Open Hole, Bit diameter 5.5" 5" drill pipe 19.50 lb/ft nominal weight, (4.276" ID) surface to 8300'. 3 1/2 drill pipe 13.30 lb/ft nominal weight between 8,300 to 15,200'. (For the ID on the 3 1/2" drill pipe remember that density of steel is 65.5 lb/gal) Drill collars, 4 3/4" OD, x 2 1/4" ID, 46.70 ppf, 15200' to TD. Surface mud system: 3 mud tanks, each 9' high, 7' wide, 36' long. With the entire drill string out of the hole: Mud level in tanks No. 1 & 2 is 72" of mud and tank No. 3 has 60" of mud (M.W: 11 ppg) For the following questions 2 to 9, do calculation by hand using equations from the lectures.