Combination hydraulic and weight-set dual string well packers

Claim 1

A DUAL PIPE STRING WELL PACKER, COMPRISING UPPER AND LOWER BODY SECTIONS HAVING PARALLEL FIRST AND SECOND LONGITUDINAL PASSAGES THERETHROUGH, FIRST AND SECOND TUBULAR MANDRELS SLIDABLY RECEIVED IN THE RESPECTIVE PASSAGES AND ADAPTED FOR CONNECTION RESPECTIVELY TO A FIRST PIPE STRING AND TO SAID UPPER BODY SECTION, A RESILIENT SEAL PORTION DISPOSED ABOUT THE MANDRELS BETWEEN THE BODY SECTIONS AND ADAPTED TO BE RADIALLY EXPANDED BY END-WISE COMPRESSION THEREBETWEEN TO SEAL WITH A SURROUNDING WELL WALL, SAID LOWER BODY SECTION INCLUDING A DOWNWARDLY AND INWARDLY TAPERING EXPANDER MEANS SLIDABLY MOUNTED ON THE MANDRELS BENEATH THE SEAL PORTION AND MOVABLE DOWNWARDLY THEREWITH, ANCHOR ELEMENTS INCLUDING RADIALLY MOVABLE SLIPS MOUNTED ON THE MANDRELS BELOW THE EXPANDER MEANS EXPANSIBLY ENGAGEABLE BY THE EXPANDER MEANS IN RESPONSE TO RELATIVE DOWNWARD MOVEMENT OF THE UPPER BODY SECTION TO ENGAGE THE WELL WALL WHEREBY FURTHER DOWNWARD MOVEMENT OF THE UPPER BODY SECTION WILL PRODUCE SAID END-WISE COMPRESSION OF SAID SEAL PORTION, SAID UPPER BODY SECTION COMPRISING A PISTON MEMBER SLIDABLY DISPOSED ON THE MANDRELS IN ABUTTING ENGAGEMENT WITH THE UPPER END OF SAID SEAL PORTION, A CYLINDER MOUNTED ON THE MANDRELS SLIDABLY ENCLOSING THE PISTON MEMBER AND COOPERATING THEREWITH TO DEFINE AN EXPANSIBLE PRESSURE CHAMBER, COOPERATING CONDUIT MEANS DISPOSED IN THE PISTON MEMBER AND IN SAID SECOND MANDREL TO PROVIDE FLUID PRESSURE COMMUNICATION BETWEEN SAID PRESSURE CHAMBER AND THE BORE OF SAID SECOND MANDREL FOR DIRECTING FLUID PRESSURE FROM SAID SECOND MANDREL INTO SAID PRESSURE CHAMBER TO MOVE SAID PISTON MEMBER DOWNWARDLY WHEREBY TO SET THE PACKER, AND RELEASABLE MEANS INITIALLY CONNECTING SAID ANCHOR ELEMENTS TO SAID FIRST MANDREL RELEASABLE BY STRAIGHT UPWARD PULL APPLIED TO THE FIRST MANDREL TO RELEASE THE PACKER.