Suppose $00ft.$ of $93$ inch drill collars are left to be pulled when flow is detected. The bore is shut$-$in and the annular preventer is closed with packing element and collar friction of $2000lbf.$

At what shut$-$in pressure will the string be ejected from the hole if:

Steel specific weight $=490lb\frac{f}{c}u.ft,$ Mud density $=12lb\frac{m}{g}al.$

Drill collar OD $=9$ in

Drill collar ID $=3$ in