Packer mill.

摘要

A dual string packer (not shown) is milled by a mill having an annular milling shoe (16) for milling the periphery of the packer and freeing it from the well bore. An axial milling head (24) mills a central hole in the top of the packer before the annular shoe (16) reaches the locking segment of the packer. A grapple (50) above the milling head engages the walls of the axial hole drilled in the packer to support the remains of the packer in the well. The grapple (50) includes a release ring (44) that can be broken in tension to release the packer mill from a stuck packer if need be. The grapple comprises a gripper sleeve (50) with longitudinally extending fingers (54) and a camming sleeve (40) for camming the fingers (54) outwardly. An expandable ring (60) inside the camming sleeve provides means for withdrawing the camming sleeve (40) from the gripper sleeve (50) if it should stick.