PRESTRESSED LINK WITH A TENSION TUBE BUSHING FOR A FLOATING OFFSHORE PLATFORM Russian patent published in 2014 - IPC E21B19/09 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to risers and associated fixing structure used during production of hydrocarbons from subsea strata. The system for fixation of a chain riser coupled to the floating offshore platform includes a tension pipe. The tension pipe has the upper section connected to the floating offshore platform in the first position, the middle section of the prestressed link and the lower section. A bushing is inserted around length of the middle section of the prestressed link. Inner diameter of the bushing and outer diameter of the middle section form an annular gap between them. The system comprises a guide coupled to the floating offshore platform in the second position different from the first one. The guide is located so that it surrounds the bushing at least partially.

EFFECT: the invention ensures durability of the tension tube durability for chain risers.

19 cl, 10 dwg