Liner top packer for liner drilling

摘要

A liner top packer is configured to be secured in a liner string, such as in a liner drilling operation. The packer is actuated from within the liner or packer body. An actuator assembly includes an inner piston, an actuator housing, and an outer piston. A tubular setting tool is moved upwardly through the inner piston, and dogs on the setting tool allow for force to be applied to the inner piston, pressurizing fluid and forcing it to the outer piston to compress a pack off element. The actuator assembly is removed by upward force applied by a foot of the setting tool on the inner piston, the actuator housing, or any other component of the actuator assembly.

主权项

1. A liner top packer system comprising:
a packer body configured to be secured in a liner string; a pack off element secured to an outer periphery of the packer body; an actuator assembly having an inner piston and an actuator housing disposed in the packer body, and an outer piston, the inner piston being disposed within the actuator housing; at least one dog selectively coupling the actuator housing to the packer body; and a packer setting tool disposed at least partially within the packer body and configured to move relative to the inner piston, the actuator housing, and the outer piston and to cause movement of the inner piston relative to the actuator housing and the packer body to:
transmit fluid to the outer piston through the actuator housing to cause compression of the pack off element to set the pack off element in a casing; andengage the at least one dog to couple the inner piston to the actuator housing.