CompRiser® is a hybrid riser system created by Ocyan in partnership with Magma Global for use in ultradeep water. The riser pipes used in CompRiser® are Magma’s m-pipe. m-pipe provides high corrosion resistance, high strength, and flexibility. Additionally, m-pipe’s flexibility allows the design of a new concept for the lower riser termination (patent pending) that allows the riser to be connected directly to rigid and flexible flowlines.
CompRiser® offers multiple benefits which tackle many of the traditional challenges for operators. Today’s FPSOs are challenged to be more efficient and cost-effective; reducing weight and loadings enable more efficient designs at lower cost. As a decoupled solution, CompRiser® applies less than 20% of the loads compared with other solutions and can reduce the load on the FPSO by up to 7000 tonnes (considering a single tower with 8 risers).
CompRiser® has been designed to meet the needs of the pre-salt areas in Brazil. It is particularly suited to deepwater locations of 2000-3000m depths and sour service conditions. CompRiser® inherits the attributes and capabilities of m-pipe with its low gas permeability and high corrosion resistance.
A compact and modular manufacturing method allows high local content. m-pipe is delivered to the yard on reels. The simplified bundle assembly can be completed in less than 30 days. The offshore installation takes another 45 days, without the need for special vessels and with high tolerance to bad weather conditions.
BrasFELS, the Brazilian shipyard of Keppel Offshore & Marine, is the latest to join the partnership initiated by Ocyan and Magma, due to its installed manufacturing capacity and reputation in the Brazilian market, which further reduces the risk assessment of the project.
Jumpers attach the CompRiser® to the FPSO, decoupling the tower from the vessel.
The upper Riser Termination Assembly transitions the risers to the jumpers
The Lower Riser Termination Assembly (patent pending) gives a direct connection to steel or flexible flowlines with no change to the CompRiser® design.
Marcelo Nunes, Subsea Director at Ocyan said: “We have worked closely with Magma to design this incredibly simple yet robust riser system. It is a perfect match on the technical side as CompRiser® provides a discrete support so that the riser works very much like a spool, in a quasi-static application. Furthermore, the concept takes advantage of the mechanical properties of m-pipe. The final result of the project has superseded our expectations.”