Retrievable hydraulic set well packers

Claim 1

A WELL PACKER INCLUDING: A TUBULAR MANDREL; ANCHORING MEANS ON SAID MANDREL MOVABLE RELATIVE TO SAID MANDREL BETWEEN RETRACTED POSITION WHERIEN THE ANCHORING MEANS IS ADJACENT THE MANDREL AND EXPANDED POSITION WHEREIN SAID ANCHORING MEANS IS REMOTE FROM THE MANDREL AND ENGAGEABLE WITH THE INTERNAL SURFACES OF A WELL CASING TO HOLD THE MANDREL AGAINST MOVEMENT RELATIVE TO THE WELL CASING; EXPANDER MEANS ON SAID MANDREL AND MOVABLE LONGITUDINALLY RELATIVE TO SAID MANDREL BETWEEN AN INITIAL INTERMEDIATE POSITION ON SAID MANDREL RELATIVE TO SAID ANCHORING MEANS WHEREIN SAID ANCHORING MEANS IS HELD IN RETRACTED POSITION BY SAID EXPANDER MEANS, A LOWER POSITION IN ENGAGEMENT WITH SAID ANCHORING MEANS HOLDING SAID ANCHORING MEANS IN ENGAGEMENT WITH SAID WELL CASING TO ANCHOR SAID MANDREL THEREIN AND AN UPPER POSITION LONGITUDINALLY RELATIVE TO SAID MANDREL AND SAID ANCHORING MEANS, SAID EXPANDER MEANS MOVING SAID ANCHORING MEANS TOWARD EXPANDED POSITION UPON MOVEMENT OF SAID EXPANDER MEANS TOWARD SAID LOWER POSITION SAID EXPANDER MEANS MOVING SAID ANCHORING MEANS TO RETRACTED POSITION UPON UPWARD MOVEMENT OF SAID EXPANDER MEANS FROM SAID LOWER POSITION TO SAID UPPER POSITION; MEANS FOR CONDUCTING FLUID UNDER PRESSURE FROM WITHIN THE MANDREL TO THE EXTERIOR THEREOF FOR MOVING SAID EXPANDER MEANS TOWARD SAID ANCHORING MEANS TO EXPAND THE SAME INTO ANCHORING ENGAGEMENT WITH THE WELL CASING; FIRST LOCK MEANS ENGAGEABLE WITH SAID EXPANDER MEANS AND SAID MANDREL FOR LOCKING SAID EXPANDER MEANS IN SAID LOWER POSITION; NORLALLY RETRACTED EXPANSIBLE SEAL MEANS DISPOSED ON SAID MANDREL BELOW SAID ANCHORING MEANS DISPOSED ON SAID MANDREL BELOW SAID MOVEMENT OF SAID SEAL MEANS ON SAID MANDREL; EXPANDING MEANS ON AID MANDREL BELOW SAID SEAL MEANS MOVABLE UPWARDLY ON SAID MANDREL TO AN UPPER POSITION FOR MOVING SAID SELA MEANS INTO EXPANDED SEALING ENGAGEMENT