Retrievable well packer

Claim 1

IN A WELL PACKER, A TUBULAR MANDREL CONNECTIBLE TO AN OPERATING PIPE STRING, A TUBULAR PACKER BODY SLIDABLY MOUNTED ABOUT THE MANDREL, AN ANNULAR RADIALLY EXPANSIBLE SEAL ELEMENT MOUNTED ABOUT THE PACKER BODY HAVING ITS UPPER END FIXEDLY SECURED TO THE BODY AND ITS LOWER END FREE FOR RELATIVE LONGITUDINAL MOVEMENT, A SLIP CONE CARRIED BY SAID LOWER END OF SAID SEAL ELEMENT FOR SAID MOVEMENT THEREWITH, A SLIP CAGE SLIDABLY MOUNTED ON THE MANDREL BELOW THE PACKER BODY AND CARRYING MEANS FOR FRICTIONALLY ENGAGING A SURROUNDING WELL WALL, RADIALLY MOVABLE WALL-GRIPPING SLIPS MOUNTED ON THE SLIP CAGE BELOW AND SLIP CONE, COOPERATING RELEASABLE LATCH ELEMENTS ARRANGED ON THE MANDREL AGAINST DOWNWARD MOVEINITIALLY SECURING SAID MANDREL AGAINST DOWNWARD MOVEMENT RELATIVE TO SAID SLIP CAGE AND RELEASABLE FOR SAID DOWNWARD MOVEMENT BY MOVEMENT OF THE MANDREL RELATIVE TO THE SLIP CAGE WHEREBY TO MOVE SAID SLIP CONE INTO EXPANSIVE ENGAGEMENT WITH SAID SLIPS, ADDITIONAL COOPERATING LATCH ELEMENTS ARRANGED BETWEEN THE MANDREL AND THE PACKER BODY TO INITIALLY SECURE THE MANDREL AGAINST DOWNWARD MOVEMENT RELATIVE TO THE PACKER BODY AND RELEASABLE BY RELATIVE LONGITUDINAL MOVEMENT BETWEEN THE PACKER BODY AND SAID SLIP CONE PRODUCED BY ENGAGEMENT OF THE LATTER WITH THE SLIPS WHEREBY TO FREE SAID MANDREL FOR DOWNWARD MOVEMENT RELATIVE TO THE PACKER BODY, AND SEAL PACKING POSITIONED ON THE MANDREL TO SEAL BETWEEN THE LATTER AND THE PACKER BODY UPON COMPLETION OF SAID DOWNWARD MOVEMENT.