Flexible riser system

Details Flexible riser system Flexible riser system

E - Fixed Constructions

21

B

166/51.4

E21B 43/013 (2006.01) E21B 17/01 (2006.01) E21B 43/017 (2006.01) F16L 37/00 (2006.01)

Patent

CA 1287568

FLEXIBLE RISER SYSTEM ABSTRACT OF THE DISCLOSURE A flexible riser 10 has a lower connector 11 which is moved laterally over the seabed by a pull-in sled 7 under a mid-water support buoy 3 to connect it to a connection point 17 on subsea equipment 1. The riser 10 is attached at a point part way along its length to buoy 3. This is done at one side of the buoy prior to construction vessel 13 laying the riser over the buoy and connecting the upper connector 24 to a production vessel 2 positioned over the subsea equipment. Attachment is done by guiding the riser pipe into a channel 36, a projection 20 on the riser engaging the channel against lowering of the pipe. An upper connector of the riser may include a single pivotal arm and a single offset guide post to maintain its orientation while it is being pulled into engagement with a mating part on the production vessel.

538445

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