Abstract: The combination of a subsurface well safety valve which is controlled through a hydraulic fluid line extending from the well surface to the safety valve of a hydraulic strainer including a chamber positioned above the actuating hydraulic piston and cylinder assembly of the safety valve. A fluid passageway adapted to be connected to receive hydraulic control fluid from the well surface extends into the chamber and an outlet fluid passageway adapted to be connected to the hydraulic piston and cylinder assembly of the safety valve extends into the chamber. The lower end of the inlet fluid passageway is positioned between the upper end of the outlet fluid passageway for protecting the piston and cylinder assembly from debris. A filter may be provided in the chamber between the lower end of the inlet fluid passageway and the upper end of the outlet fluid passageway.

Abstract: A well packer adapted to be set in a well conduit and includes a mandrel, a packing seal surrounding the mandrel and slips positioned above the packing seal against an abutment. The abutment is connected to a latching head and to the mandrel. A connection is positioned adjacent the lower end of the latching head which can be broken for releasing the latching head and preferably the abutment from the mandrel for allowing the milling out of the packer without the necessity of milling the latching head. The packer is released by an upward jar on the latching head for retrieving the latching head in some embodiments and by chemical cutting in another embodiment. The packer slips are then milled out for releasing the packer for upward movement.