1. Calculate the allowable mud weight at 5,000 ft, given the following data: • Cake thickness = 1 /8 in. • Diameter of the hole = 121 /4 in. • Pipe diameter = 61 /4 in. • Coefficient of friction =...

1. Calculate the allowable mud weight at 5,000 ft, given the following data: • Cake thickness = 1 /8 in. • Diameter of the hole = 121 /4 in. • Pipe diameter = 61 /4 in. • Coefficient of friction = 0.25 • Pore pressure at 5,000 ft = 2,340 psi • MOP = 75 kips 2. Calculate the optimum fishing time, given the following data: • Well depth = 3,000 m • Estimated stuck depth = 2,500 m • Daily operating rate of the rig = $1,500/day • Value of drill string below stuck point = $100,000 • Time taken to drill original hole below stuck point = 30 h