Multiple tubing hanger and seal assembly

Claim 1

A HANGER ASSEMBLY FOR SUSPENDING A PLURALITY OF TUBING STRINGS FROM THE BORE OF A WELL HEAD HAVING UPWARDLY FACING SEAT MEANS, IN SIDE-BY-SIDE RELATION COMPRISING: A PLURALITY OF HANGER UNITS EACH HAVING MEANS FOR RECEIVING AND SUSPENDING A TUBING STRING THEREFROM, ONE OF SAID UNITS HAVING AN ANNULAR PART OF A SIZE TO FIT WITHIN THE WELL HEAD BORE, AND INCLUDING DOWNWARDLY FACING SEAT MEANS FOR ENGAGING SAID WELL HEAD SEAT MEANS THROUGHOUT THE INNER PERIPHERY THEREOF TO PROVIDE INDEPENDENT SUPPORT FOR SAID ONE UNIT THEREIN, THE TUBING STRING RECEIVING AND SUSPENDING MEANS OF SAID ONE UNIT BEING SPACED RADIALLY FROM THE AXIS OF SAID ANNULAR PART, SAID ONE UNIT ALSO INCLUDING A SECTOR-SHAPED PART OF SUBSTANTIALLY 360* ---X EXTENT WHERE X EQUALS THE NUMBER OF UNITS WHICH PART EXTENDS ABOVE A PORTION OF SAID ANNULAR PART, THE REMAINDER OF SAID ANNULAR PART DEFINING UPWARDLY FACING SECTORSHAPED SURFACE MEANS AND HAVING AN OPENING EXTENDING THROUGH AT LEAST THE CENTRAL PORTION OF EACH 360* ---X EXTENT THEREOF, THE REMAINDER OF SAID UNITS EACH COMPRISING A SECTOR-SHAPED PART OF SUBSTANTIALLY 360* ---X EXTENT SUPPORTABLE ON SAID ANNULAR PART IN OPERATIVE COEXTENSIVE RELATIONSHIP WITH SAID SECTOR-SHAPED SURFACE MEANS OF SAID ONE UNIT WITH ITS ASSOCIATED TUBING STRING RECEIVING AND SUSPENDING MEANS VERTICALLY ALIGNED WITH AN ASSOCIATED OPENING FORMED IN THE REMAINING PORTION OF THE ANNULAR PART OF SAID ONE UNIT, THE TUBING STRING RECEIVING AND SUSPENDING MEANS FOR AT LEAST ONE OF THE REMAINDER OF SAID UNITS INCLUDING A HANGER BUSHING AND MEANS FOR MOUNTING SAID HANGER BUSHING WITHIN ITS CORRESPONDING SECTOR-SHAPED PART FOR ROTATION ABOUT ITS AXIS, THE TOP SURFACE OF THE AXIALLY EXTENDING PART OF SAID ONE UNIT DEFINING WITH THE TOP SURFACE OF SAID REMAINING UNITS A SUBSTANTIALLY CONTINUOUS TOP SURFACE AXIALLY DISPLACED FROM SAID SURFACE MEANS DEFINED BY SAID REMAINDER OF THE ONE UNIT, AND HOLD-DOWN SCREW ACTUATED SEALING MEANS CARRIED ON THE TOP SURFACE AND ENGAGEABLE WITH SAID BORE THROUGHOUT ITS PERIPHERY AND THE TUBING STRING RECEIVING SAID SUSPENDING MEANS FOR EFFECTING A SEAL BETWEEN SAID BORE AND ALL OF SAID HANGER UNITS WHEN THE LATTER ARE DISPOSED IN SAID POSITION.