Hydraulic packer with safety joint release

Claim 1

A WELL PACKER APPARATUS FOR LOWERABLE WITHIN A WELL BORE INCLUDING: A WELL PACKER ASSEMBLY COMPRISING A SUPPORT, A PACKING ELEMENT MOUNTED ON THE SUPPORT, AND AN ANCHORING MEANS, ALSO MOUNTED ON THE SUPPORT, FOR ANCHORING SAID ASSEMBLY WITHIN SAID BORE, SAID PACKER ASSEMBLY HAVING A LONGITUDINAL PASSAGE EXTENDING THERETHROUGH, AN UPPER SECTION OF A TUBING STRING HAVING ITS LOWER PORTION EXTENDING INTO THE PASSAGE AND ROTATABLY ATTACHED TO THE UPPER END OF THE PACKER ASSEMBLY, A LOWER SECTION OF SAID TUBING STRING HAVING ITS UPPER PORTION PROJECTING INTO SAID PASSAGE WITH ITS LOWER PORTION EXTENDING DOWNWARDLY BELOW THE PACKER ASSEMBLY, A THREADED CONNECTION BETWEEN SAID UPPER AND LOWER SECTIONS OF SAID TUBING STRING TO FORM A CONTINUOUS TUBING STRING EXTENDING THROUGH THE PACKER ASSEMBLY, MEANS FOR SETTING THE PACKING ELEMENT AND ANCHORING MEANS OF THE PACKER ASSEMBLY TO SET THE SAME WITHIN THE BORE, THE THREADED CONNECTION BEING OPERABLE BY ROTATION OF THE UPPER TUBING SECTION OF TUBING RELATIVE TO THE LOWER TUBING SECTION TO CAUSE MOVEMENT OF THE SECTIONS WITH RESPECT TO EACH OTHER, CO-ACTING MEANS ON SAID UPPER SECTION AND ON THE PACKER ASSEMBLY TO UNSET AND RELEASE THE LATTER UPON A PREDETERMINED RELATIVE MOVEMENT OF THE TUBING SECTIONS WITH RESPECT TO EACH OTHER, SAID ROTATION OF THE UPPER TUBING SECTION RELATIVE TO THE LOWER TUBING SECTION COMPLETELY SEPARATING SAID SECTIONS, WHEREBY THE UPPER SECTION AND PACKER ASSEMBLY MAY BE REMOVED FROM THE BORE SEPARATELY FROM THE LOWER TUBING STRING SECTION.