Multiple string well packer

Claim 1

A MULTI-STRING WELL PACKER ASSEMBLY FOR CONNECTION IN A WELL TUBING STRING WITHIN A WELL BORE INCLUDING, A HEAD MEMBER, A FIRST MANDREL, A SECOND MANDREL SECURED TO SAID HEAD MEMBER IN SIDE-BY-SIDE PARALLEL RELATIONSHIP TO SAID FIRST MANDREL, A PISTON SECURED TO SAID FIRST MANDREL, A CYLINDER SECURED TO SAID HEAD MEMBER, SAID PISTON AND SAID CYLINDER BEING CONNECTED FOR LIMITED LONGITUDINAL MOVEMENT RELATIVE TO EACH OTHER, AN EXTERNAL ABUTMENT ON THE LOWER END OF SAID FIRST MANDREL, MEANS LOCKING SAID PISTON AND SAID CYLINDER IN A PREDETERMINED POSITION RELATIVE TO EACH OTHER WITH SAID EXTERNAL ABUTMENT SPACED FROM SAID CYLINDER, AN UPPER PACKING ELEMENT AND ANCHORING UNIT FOR SUPPORTING THE ASSEMBLY AGAINST DOWNWARD MOVEMENT IN THE WELL BORE MOUNTED ON SAID MANDRELS AND LOCATED ADJACENT SAID CYLINDER, A LOWER PACKING ELEMENT AND ANCHORING UNIT FOR SUPPORTING THE ASSEMBLY AGAINST UPWARD MOVEMENT IN THE WELL BORE AND LOCATED ADJACENT SAID EXTERNAL ABUTMENT, HYDRAULICALLY-ACTUATED MEANS ON SAID FIRST AND SECOND MANDRELS BETWEEN SAID UPPER PACKING ELEMENT AND ANCHORING UNIT AND SAID LOWER PACKING ELEMENT AND ANCHORING UNIT FOR MOVING THE ELEMENTS AND UNITS INTO SET POSITION CONFINED BY SAID CYLINDER AND SAID EXTERNAL ABUTMENT, AND MEANS CO-ACTING WITH SAID LOCKING MEANS AND SAID PISTON AND CYLINDER FOR RELEASING THE LOCKING MEANS TO PERMIT MOVEMENT OF SAID PISTON AND SAID FIRST MANDREL RELATIVE TO SAID CYLINDER AND SAID HEAD MEMBER TO THEREBY MOVE SAID EXTERNAL ABUTMENT AWAY FROM SAID LOWER PACKING ELEMENT AND ANCHORING UNIT WHEREBY SAID PACKING ELEMENTS AND ANCHORING UNITS ARE MOVED TO AN UNSET POSITION.