Page 38: of Offshore Engineer Magazine (Jun/Jul 2013)

37 39

ESP power umbilical Main umbilical

Subsea

Each power umbilical has three, 3-phase power circuits to drive The main umbilical was optimized for hydraulic control system

ESPs and provides a spare circuit. Source: JDR Cable Systems. response and chemical injection. Source: JDR Cable Systems.

vide the necessary power and controls The contract included dynamic riser arc-length, buoyancy module distribu- for the new wells. The LH 4-1 feld design; modeling FPS movements dur- tion, riser tension across the umbilical uses a high-power changeover switch ing workovers of the existing LH 11-1 length, and minimum-maximum, sag/ to control the ESPs, so that manual wells directly below the semisubmers- bend clearance.

switching via ROV is unnecessary. ible.  The main and power umbilical Hardware delivered included fex-

This feld is the frst subsea develop- risers were optimized to provide fa- ible pull-in heads, hang-off bodies and ment to use this technology, according tigue resistance for the system’s design split clamps, dynamic bend stiffeners, to CNOOC. life.Riser engineering had several com- buoyancy modules, riser base clamps, ponents requiring tension/angle plots and subsea termination units.

for bend stiffener design, FPS hang-off The Hartlepool, UK facility was

Umbilicals

JDR was contracted by CNOOC to loads, touch-down point location and chosen for the LH 4-1 project so that all develop and manufacture more than the umbilicals could be manufactured

Updated umbilical 42km of subsea production umbilicals concurrently. To ship the umbilicals glossary available and ESP power umbilicals for LH 4-1. to China, JDR had a heavy-lift vessel

With umbilical system complexity con-

The oil feld includes one manifold for ftted with a temporary, 2,000-tonne stantly increasing, the Umbilical Manu- the eight production wells, jumpers, carousel to carry the load. The single facturers’ Federation (UMF) has acted to and an 18in.-diameter subsea pipeline.  carousel held all four umbilicals along standardize terminology by publishing

JDR supplied three, 14km ESP power with topside hardware, dynamic bend umbilicals, one 14km main produc- stiffeners, and subsea terminations. a “Glossary of Terms and Abbreviated tion control umbilical, and a bridging Upon arrival, the umbilicals were

Terms for use with Umbilical Systems” manifold control umbilical. transferred to another vessel for instal- in a guidance note, UMF – GN02.

Each ESP power umbilical included lation. LH 4-1 feld produced frst oil in

UMF’s goal for the reference is to three, 3-phase power circuits to electri- July 2012. remove ambiguity. The glossary will fy the eight wells and provide a redun- aid communication at all stages of dant spare circuit.  This nine-core-style the manufacturing process: design,

FURTHER READING power umbilical reduces the number of procurement, and supply, so that design

Energy’s new era risers needed, lowers complexity, and requirements are clear. The text will be

OE March 2013 - OE exclusive minimizes project cost. The umbilical updated periodically and the current bundles were built on JDR’s vertical version (issue 3) can be accessed and

Beibu in production lay-up machine; thee 60 tonne/bobbin downloaded from the UMF website,

OTC January 2013 - online only capacity reduced the number of core www.umf.as. splices required.

Chevron scores Chinese PSCs

The organization provides additional

The main thermoplastic umbili- OE January 2013 - online only guidance notes on umbilical interfaces, cal was selected to maximize system free span analysis, comparisons of

China deepens its resolve reliability and minimize project cost. steel tubes and thermoplastic hoses, on energy security

It was optimized for hydraulic control

OE July 2010 and data sheets for super duplex tub- system response and for delivery of ing. UMF was established in 2001 and injection chemicals.  The cross-section

Rolling in the deep includes manufacturer’s: Aker Solutions, was designed with the drag diameter-

Annual survey of key deep water

Duco, JDR Umbilical Systems, Nexens, to-weight ratio necessary to meet developments worldwide, OE April

Oceaneering , and Parker Scanrope.

2012, pp. 42-70.

dynamic mode requirements.

OE | June 2013 oedigital.com 40 039OE_0613_Subsea-Umbil.indd 40 5/27/13 4:02 PM