Subterranean tool with multiple release capabilities

A tool for subterranean use, comprising:

• a mandrel;
• a final controlled element selectively movable between a first and a second position;
• a movable member on said mandrel said movable member selectively holding said final controlled element in said first position;
• a lock to selectively prevent movement of said mandrel with respect to said final controlled element;
• said movable member selectively defeating said lock in a first movement and enabling said final controlled element to be moved from said first position to said second position in a subsequent movement;
• said movable member is driven by a hydraulic system;
• said movements of said movable member are in the same direction;
• said movable member is driven by a plurality of pistons;
• said plurality of pistons move in tandem for one of said movements while another of said movements is driven by one of said plurality of pistons;
• said plurality of pistons comprise a primary and a secondary annular piston;
• said primary piston comprises a travel stop;
• said lock is defeated when said primary piston travel stop engages said mandrel;
• said primary piston drives said secondary piston against said movable member in a first direction when said hydraulic system is pressurized until said stop is engaged by said mandrel.

A tool for subterranean use, comprising:

• a mandrel;
• a final controlled element selectively movable between a first and a second position;
• a movable member on said mandrel said movable member selectively holding said final controlled element in said first position;
• a lock to selectively prevent movement of said mandrel with respect to said final controlled element;
• said movable member selectively defeating said lock in a first movement and enabling said final controlled element to be moved from said first position to said second position in a subsequent movement;
• said movable member is driven by a plurality of pistons;
• said lock selectively protects a shear member mounted to said mandrel from stress applied to said mandrel;
• said movable member comprises an inner sleeve;
• said lock selectively securing said mandrel to an outer sleeve overlapping said inner sleeve, whereupon initial movement of said inner sleeve allows a dog to exit a groove in said outer sleeve to expose said shear member to stress applied to said mandrel.

A tool for subterranean use, comprising:

• a mandrel;
• a final controlled element selectively movable between a first and a second position;
• a movable member on said mandrel said movable member selectively holding said final controlled element in said first position;
• a lock to selectively prevent movement of said mandrel with respect to said final controlled element;
• said movable member selectively defeating said lock in a first movement and enabling said final controlled element to be moved from said first position to said second position in a subsequent movement;
• said movable member is driven by a plurality of pistons;
• said final controlled element comprises a plurality of gripping collets that engage a packer polished bore receptacle in said first position and release from the polished bore receptacle in said second position.