J-tube method and apparatus

Details J-tube method and apparatus J-tube method and apparatus

E - Fixed Constructions

21

B

61/5.8

E21B 17/01 (2006.01) E21B 33/038 (2006.01) F16L 1/19 (2006.01)

Patent

CA 1189708

A B S T R A C T A method and apparatus for installing a pipeline riser through a J-tube at a spud can-founded, compliant, offshore platform are disclosed. The J-tube is mounted on the platform above the maximum expected mudline. An upper longitudinal section of the J-tube passes through guide rings on the platform while a lower longitudinal section is maintained free of the platform. After platform settlement, the J-tube is lowered to an elevation near the actual mudline. During riser installation through the J-tube, a lower end of the J-tube is restrained from lateral movement by a latch attached to the platform. Before production operations, the lower end is released from the latch so that flexibility of the J-tube accommodates movement of the platform.

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