Hydraulically-actuated well packers

Claim 1

A WELL PACKER ASSEMBLY INCLUDING, A MANDREL, AN ENLARGEMENT CONNECTED TO THE UPPER END OF THE MANDREL, A PACKING ELEMENT SURROUNDING THE MANDREL AND HAVING ITS UPPER END ADJACENT THE ENLARGEMENT WHEREBY THE PACKING ELEMENT IS CONFINED AGAINST UPWARD MOVEMENT WITH RESPECT TO THE MANDREL, ANCHORING MEANS ALSO SURROUNDING THE MANDREL BELOW THE PACKING ELEMENT, HYDRAULICALLYACTUATED MEANS COMPRISING TWO ELEMENTS MOVABLE RELATIVE TO ONE ANOTHER, THE FIRST OF SAID TWO ELEMENTS HAVING CONNECTION WITH THE ANCHORING MEANS SO THAT SAID ANCHORING MEANS IS SET UPON MOVEMENT OF SAID FIRST ELEMENT, THE SECOND OF SAID ELEMENTS HAVING CONNECTION WITH THE MANDREL SO THAT SAID MANDREL IS MOVED WHEN SAID SECOND ELEMENT IS MOVED RELATIVE TO SAID FIRST ELEMENT TO MOVE THE ENLARGEMENT AT THE UPPER END OF THE MANDREL AND THEREBY APPLY AN ENDWISE FORCE TO THE PACKING ELEMENT TO DEFORM THE SAME INTO SEALING POSITION, A TUBULAR CONDUCTOR EXTENDING ENTIRELY THROUGH THE PACKER ASSEMBLY, COUPLING MEANS CONNECTING SAID CONDUCTOR TO SAID SECOND ELEMENT, AND MEANS ESTABLISHING COMMUNICATION BETWEEN THE BORE OF THE CONDUCTOR AND SAID HYDRAULICALLY-ACTUATED MEANS TO OPERATE THE LATTER AND THEREBY SET THE ANCHORING MEANS AND PACKING ELEMENT, THE ENLARGEMENT ON SAID MANDREL BEING EXPOSED TO THE PRESSURE IN THE AREA ABOVE THE SET PACKER WHICH PRESSURE ACTS DOWNWARDLY UPON THE ENLARGEMENT TO URGE AND MAINTAIN THE PACKING ELEMENT IN ITS SET POSITION.