Patent ID: 7219738

Claim:
An inner riser adjustable hanger and seal assembly for applying tension to a casing string secured at a lower end at a well and supported at an upper end by a wellhead housing, the hanger and seal assembly comprising: the wellhead housing having a housing locking member on an inner surface thereof; a tensioning mechanism for tensioning the casing string and securing the upper end of the tensioned casing string to the wellhead housing, the tensioning mechanism including a plurality of axially spaced tension members on an inner surface of a tensioning sleeve fixed to the wellhead housing, the tensioning mechanism axially connecting in tension the casing string to a selected one or more of the plurality of axially spaced tension members such that a desired tension is exerted on the casing string; a seal body for positioning within the wellhead housing and radially within the tensioning mechanism; a seal body locking member radially movable into engagement with the housing locking member to fix the axial position of the seal body relative to the wellhead housing; an upper seal assembly for sealing between the seal body and the wellhead housing; and a lower seal assembly for sealing between the seal body and the casing string, such that the casing string is tensioned without appreciable rotation of the hanger body, and the seal body being fluid impermeable from the upper seal assembly to the lower seal assembly.