Patent ID: 7188677

Claim:
A device for tensioning and relieving production tubing, the production tubing extending from a subsea well up through a riser to a floating installation, wherein an extension of production tubing passes through a telescopic unit in an upper section of the riser, the device comprising: a tubing tensioner disposed below and in the proximity of the lower end of the telescopic unit, the tubing tensioner comprising a cylinder section and a housing that is integrated in the riser, wherein the cylinder section comprises a piston and cylinder that are telescopically received by the housing; the cylinder having plurality of ratchets adapted to engage an annular internal recess formed in a lower inner face of the housing; the piston having an open inner diameter that forms a conduit between the production tubing and the production tubing extension and an outer diameter that is greater than the outer diameter of the production tubing; and an inlet for supply of pressurized fluid to a lower chamber of the cylinder.