Valve controlled well packer apparatus

Claim 1

A WELL PACKER APPARATUS ADAPTED TO BE LOWERED AND SET IN PACKET-OFF CONDITION IN A WELL BORE, INCLUDING A BODY HAVING A FLUID PASSAGE, A VALVE MEMBER MOVABLE UPWARDLY AND DOWNWARDLY IN SAID BODY PASSAGE BETWEEN POSITIONS OPENING AND CLOSING SAID PASSAGE, SHIFTING MEANS CONNECTIBLE TO A RUNNING-IN STRING EXTENDING TO THE TOP OF THE WELL BORE AND MOVABLE UPWARDL AND DOWNWARDLY IN SAID PASSAGE BY THE RUNNING-IN STRING, MEANS RELEASABLY COUPLING SAID SHIFTING MEANS TO SAID VALVE MEMBER FOR TRANSMITTING THE UPWARD AND DOWNWARD MOVEMENT OF SAID SHIFTING MEANS TO SAID VALVE MEMBER AND SHIFT SAID VALVE MEMBER TO PASSAGE OPENING AND CLOSING POSITIONS, MEANS ENGAGEABLE WITH SAID COUPLING MEANS FOR LOCKING SAID COUPLING MEANS TO SAID SHIFTING MEANS DURING UPWARD MOVEMENT OF SAID SHIFTING MEANS AND VALVE MEMBER IN SAID PASSAGE, SAID VALVE MEMBER HAVING A LONGITUDINAL PASSAGE THERETHROUGH TO PERMIT FLUID PRESSURE IN SAID BODY, WHEN SAID VALVE MEMBER IS IN CLOSED POSITION, TO PASS FROM ONE END OF SAID VALVE MEMBER TO ITS OPPOSITE END AND ACT WITH EQUAL FORCE IN OPPOSITE LONGITUDINAL DIRECTIONS ON SAID VALVE MEMBER, PRECLUDING SUCH FLUID PRESSURE FROM EXERTING A SHIFTING FORCE ON SAID VALVE MEMBER.