Patent ID: 8893806

Claim:
An exercise tool assembly for operating a downhole tool auxiliary to a primary actuator system of the downhole tool, the exercise tool assembly comprising: a cylinder mandrel configured to be received in a central bore of the downhole tool; and a piston mandrel in and sealed with the cylinder mandrel, the exercise tool assembly configured to couple to an actuator sleeve of the downhole tool and to couple to the downhole tool at a location apart from the actuator sleeve, the piston mandrel responsive to an increase or decrease in pressure in the central bore to translate relative to the cylinder mandrel and translate the coupling with the actuator sleeve relative to the coupling at the location apart from the actuator sleeve, where the piston mandrel is responsive to an increase in pressure to translate from a first position to a second position, and the exercise tool assembly comprises a return spring configured to return the piston mandrel to the first position in response to a decrease in pressure; and where the primary actuator system of the downhole tool is operated by a hydraulic signal and has a first hydraulic area on which the hydraulic signal acts, and where the piston mandrel has a second hydraulic area that is larger than the first hydraulic area.