In: Mechanical Engineering
Calculate the pressure losses across the different sections of drill pipe and annulus by using the Bingham plastic fluid model (You must draw the wellbore structure chart: without the chart, 50% points will be deducted) PROBLEM: MD/TVD: 12,031 ft Surface casing: 2,135 ft of 133⁄8-in. 61 lb/ft Intermediate casing: 10,786 ft of 95⁄8-in. 40 lb/ft Bit: 85⁄8 in. Nozzles (32nds in.): 11, 11, 11 Surface connections: Case 3 Drill pipe: 41⁄2 in., 16.6 lb/ft Drill collars: 390 ft of 7 in. x 21⁄4 in. Surface pressure: 3,000 psi Mud weight: 12.8 lb/gal Funnel viscosity: 42 sec/qt Plastic viscosity: 19 cP Yield point: 15 lb/100 ft2 Initial gel: 8 lb/100 ft2 Flow rate: 335 gpm