Rosa - Total.com

fPso:
> Hull dimensions: 300 m x 60 m x 31 m
> storage capacity: 2 million barrels
> Weight of the topsides: 23,500 tonnes
+ 5,600 tonnes of additional equipment
dedicated to the rosa development
(including 300 tonnes of temporary
structures required during
the installation phase)
> Crude oil production: increased
to 270,000 barrels per day with rosa
> Liquids processing capacity: increased
to 450,000 barrels per day with rosa
> Water treatment capacity: increased
to 300,000 barrels per day with rosa
> Water injection capacity: increased
to 700,000 barrels per day with rosa
> gas injection: 8 million cubic meters
> Power generating capacity: 3 x 25 MW
> Capacity of living quarters: 180 people
sPs:
> 14 producing wells
> 11 water injection wells
> 4 production manifolds, 4 slots each
> Multiphase metering on each
producing well
sUrf:
> 2 Pipe in Pipe production loops
(8’’ x 12’’), for 64 kilometers
> 2 water injection lines (10’’),
for 40 kilometers
> 1 Bundled Hybrid offset riser (BHor)
tower, a concept developed by saipem,
1,200 meters high, anchored 140 meters
west of the fPso
> 4 umbilicals (54 kilometers),
for monitoring and control of manifolds
and producing wells
> 4 umbilicals (15 kilometers),
for monitoring and control of water
injection wells
> 4 service lines (3’’), (52 kilometers)
rEsErVoIrs:
> outflow temperature: 65° C
> Initial pressure: 270 bar
INNoVaTIVE soLUTIoNs
PrEVENTINg HyDraTE forMaTIoN
Given the significant distance between the reservoirs and the
FPSO, the low subsea temperatures (maximum 4°C), and the
high pressures involved, transporting the fluids from the subsea
installations to the topsides is a challenge that only compounds
the difficulties of the Rosa tie-back: the fluids must be kept at a
temperature sufficient to allow processing and prevent hydrate
formation. To cope with these stringent thermal constraints, the
Group relied on sophisticated numerical calculation models and
conducted full-scale tests to qualify the chosen technological
solutions. The purpose of this approach was to define the highly
insulated subsea production system and flowlines and guarantee
their thermal performance. In the event of a production shutdown,
the fluids can be maintained above 20°C for 21 hours in
the manifolds, for 8 hours in the Christmas trees and jumpers,
and for 21 hours in the flowlines and risers. From its outflow
temperature of 50°C, the crude must reach the FPSO process
modules nearly 20 kilometers away at no less than 35°C.
The choice of Pipe in Pipe technology for the production flowlines
and risers, the use of a riser tower, highly insulated manifolds
and wellheads and the installation of subsea multiphase metering
constitute a package of innovative solutions selected by Total that
make this gigantic industrial puzzle such an outstanding example
of offshore technology.