Patent ID: 7673693

Claim:
A zonal isolation device comprising: a packer assembly comprising opposable slips; an internal setting mechanism operable to actuate the packer assembly from an unset position to a set position, the internal setting mechanism comprising: a piston case; and a piston selectively at least partially carried within the piston case; wherein the piston case and the piston are configured to selectively move in opposing longitudinal directions in response to a differential pressure applied to the internal setting mechanism; and a locking mechanism selectively operable to maintain the packer assembly in the set position and to release the packer assembly from the set position, wherein the locking mechanism is configured for actuation in response to the differential pressure applied to the internal setting mechanism, the locking mechanism comprising a biased locking arm configured to selectively restrict longitudinal movement of a mandrel relative to the piston case and wherein the biased locking arm is selectively restricted from movement in response to a location of the piston; wherein the zonal isolation device is resettable and retrievable; and wherein the piston is connected to a pin that is selectively carried within a continuous J-slot and wherein movement of the piston is selectively restricted in response to where within the continuous J-slot the pin is located.