American Oil and Gas Reporter - June 2016 - 89

SpecialReport: Offshore Technology
initial upending phase. An important function of the soft tank was containing the solid ballast needed to stabilize the platform
once the hull was up-righted on location.
The center well inside the hard tank is
sized for 10 flowline risers, 10 umbilicals
and two flexible flowlines, as well as import and export flowlines. The total hull
weight is 22,300 short tons, excluding the
solid ballast (12,400 tons). The hull also
stores 2,900 barrels of methanol in a cofferdam area above the waterline.
The mooring system consists of nine
legs, laid out in three groups of three.
From bottom to top, each mooring line is
composed of a 112-foot long suction anchor (18 feet in diameter) fitted with 92
feet of pile chain and 300-350 feet of
ground chain, two 5,000-foot polyester
rope sections (10 inches in diameter), two
45-foot long polyester rope test inserts,
and a 1,000-foot long spar chain segment.
Subsea connectors allowed the piles to be
preinstalled.
Lucius uses four umbilical slots while
Hadrian South uses one. All risers are
8.625-inch outside dimeter risers with a
9,300-psig design pressure. The Lucius
risers are insulated with a glass flake syntactic polyurethane wet system for flow
assurance. The Hadrian risers did not require insulation, but were built identically to make them suitable for oil service,
with a view that they might one day be
reused.
The production lines run through pull
tubes and guides from the bottom and outside of the truss to the top of the hard tank
inside the center well. The umbilical and
future tieback lines run through the soft
tank, and up the truss and hard tank
through guides.
Each Lucius riser pair has one control/chemical umbilical and one gas lift
umbilical running to the base of the riser
for enhanced recovery and flow assurance.
The chemical umbilical can deliver lowdosage hydrate inhibitors, methanol, corrosion inhibitor, asphaltene inhibitor, xylene, and paraffin inhibitor to each well.
The pipeline end manifolds have spare connections for future wells, and removable
pigging loops to allow additional tiebacks.
The spar is designed to support two additional subsea tiebacks, each consisting
of two flowlines and two umbilicals. One
umbilical is assumed for controls/chemical injection, and the other for artificial lift.
The pull tube design for future risers was
intended to accommodate an insulated
15,000-psig, 8.0-inch riser, but sensitivi-

ties also were done to check for a 10,000psig, 6.0-inch gas riser to make the design
flexible enough to accommodate a range
of options. Guides above the keel were designed to accommodate SCRs or flexible
pipe.
In addition, the spar accommodates
two, 10-inch flexible flowlines for future
waterflooding. The flexibles are intended
to come in through the center section on
the keel and go through guides to the spar

deck, similar to the umbilicals. These
slots can be used for additional umbilicals
also.
The top of the soft tank is fitted with
porches to receive the fitting on the titanium stress joint (TSJ) for each of the two
16-inch gas and oil export SCRs. Installing the SCRs after setting the topsides
required using an installation beam, turning sheaves, and a chain jack on the main
deck.

JUNE 2016 89



American Oil and Gas Reporter - June 2016

Table of Contents for the Digital Edition of American Oil and Gas Reporter - June 2016

Contents
American Oil and Gas Reporter - June 2016 - Cover1
American Oil and Gas Reporter - June 2016 - Cover2
American Oil and Gas Reporter - June 2016 - Contents
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