Your company want to complete a well at 12000 ft using a 6.625-in. production casing. The pore pressure and fracture gradient data are given in below Table. Design surface and intermediate casing programs for this well. Use the same design factors and other safety margins used in Example 7.9 from reference book (Applied Drilling Engineering. Bourgoyne et. al 1991). Assume operating pressure in surface equipment is 5000 psi. Depth (ft) Pore pressure gradient Fracture pressure gradient (lbm/gal) (lbm/gal) 1000 9.0 12.0 2000 9.0 12.9 3000 9.0 13.6 4000 9.0 14.2 5000 9.0 14.8 6000 9.0 15.2 7000 9.0 15.6 8000 9.0 15.9 9000 12.0 16.8 10000 14.0 17.4 11000 15.0 17.8 12000 16.0 18.1