US Patent 9476272 Pressure setting tool and method of use

A non-explosive, down hole, setting tool, system method includes a hydraulic fluid reservoir, a first compressible fluid for applying a first force against hydraulic fluid in contact with one side of a setting piston that is movable in the tool, and a second compressible fluid for applying a second force greater than the first force against the other side of the setting piston. Hydraulic fluid is pumped against one end of the setting piston to overcome the second force and move the setting piston. A reset valve is located in a hydraulic fluid return passageway that is connected between other end of the setting piston and the source of hydraulic fluid. The reset valve can move to selectively block the flow of the hydraulic fluid or allow hydraulic fluid to flow through the fluid return passageway, so that the setting piston can move the setting piston back to its start position.