Shut-off valve for dual completion upper packer

Claim 1

A WELL PACKER APPARATUS ADAPTED TO BE SET IN A FLUID TIGHT MANNER IN A WELL CASING TO CLOSE OFF THE SPACE AROUND A PAIR OF TUBING STRINGS, SAID WELL PACKER COMPRISING A BODY MEMBER PROVIDED WITH OUTWARDLY EXPANSIBLE SEALING MEANS CARRIED THEREON AND HAVING FIRST AND SECOND LONGITUDINAL PASSAGES THERETHOUGH, A FIRST TUBING STRING ADAPTED TO EXTEND THROUGH SAID FIRST LONGITUDINAL PASSAGE, A SLIDABLE SLEEVE VALVE MEMBER POSITIONED IN SAID SECOND LONGITUDINAL PASSAGE FOR LIMITED AXIAL MOVEMENT THEREIN, SAID VALVE MEMBER IN ITS OPEN POSITION BETWEEN THE SPACES IN COMMUNICATION IN ITS OPEN POSITION BETWEEN THE SPACES ABOVE AND BELOW SAID BODY MEMBER AND OUT OF COMMUNICATION IN ITS CLOSED POSITION, COOPERATING STOP AND VALVE POSITIONING MEANS CARRIED BY SAID SLEEVE VALVE MEMBER AND SAID PACKER FOR LIMITING THE MOVEMENT OF SAID SLEEVE VALVE MEMBER IN BOTH DIRECTIONS, A SECOND TUBING STRING HAVING A LOWER END OF A SIZE ADAPTED TO BE POSITIONED IN THE UPPER END OF SAID SECOND LONGITUDINAL PASSAGE AND SEATED IN THE UPPER END OF THE SLEEVE VALVE MEMBER, AND COOPERATING LATCH MEANS CARRIED BY THE LOWER END OF SAID SECOND TUBING STRING AND THE UPPER END OF SAID SLEEVE VALVE MEMBER.