Flowlines and risers

Flowlines & Risers Chris Braithwaite, COO Wellstream International Limited

© Wellstream International International Limited. Duplication in full or in part is prohibited. prohibited.

Wellstream Snapshot •

Manufacturer of unbonded flexible flowlines & risers since 1989 – – – – – –

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Strong #2 in industry HQ in Newcastle since 1996 Bespoke technology for deepwater Key enabler in floating production and subsea developments Fast developing onshore capability - FlexSteel™ Developing installation capability

Major exporter – More than 90% of all output

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New plant in Niteroi, Brazil opened May 2007 Significant R&D investment

© Wellstream International Limited. Duplication in full or in part is prohibited.

History in North East •

Headquartered in the North East since 1996 – Corporate, technology and manufacturing global centre – First production Dec-97

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Site selected from > 20 potential locations in Europe Attracted by: – Dee water access and heav lift load-out ca abilit – Strong engineering & manufacturing base of North East – Local & government support


Global Locations

Calgary Newcastle upon Tyne Denver Houston

Panama City

Niterói, Rio de Janeiro Perth

Offshore Systems Manufacturing Sales and Customer Support Project Management & Engineering FlexSteelTM – Onshore Systems Manufacturing


Terminology – Flowlines & Risers

Transfer Lines

Jumpers

Risers

Flowlines


In-Field or Flowlines • • • • • •

From wellhead or manifold to platform or FPSO Carry a mixture of oil, gas, water and sand Short lengths <30km Small diameter <12” Flexible or ri id or bundle Laid by reel, J-lay, S-lay or towed methods – Depends on cost – Water depth, vessel availability, diameter and coating – Many other factors


Riser Applications • Section of line from seabed to fixed or floating topsides • Many types and uses: – Drilling – – Water injection – Export/import – Workover – Control, power and chemicals


Flexible Production and Export Risers

FPSO Storage vessel

Turret with bend stiffeners Anchor cables

Tethered midwater arch buoy Flowline risers (lazy S) Clump weight Subsea manifold

Distributed buoyancy

Export risers (lazy wave)

Touchdown clamp and tether


Rigid Risers to Floating Vessels

FPSO vessel

Shuttle SPM

Turret W riser

Top- tensioned

Bare pipe

Lazy wave steel catenary riser

Buoyant sleeves

Buoyant sleeves

Compliant vertical axis riser

Steel catenary riser

Bare pipe


Hybrid Risers •

Rigid tower

Buoyancy

– Self-buoyant – Minimise transfer of load to FPSO

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Linking flexibles Fixed vessel

Flexible risers

Export lines from FPSO to SPM

– Benign conditions Rigid riser tower

Girassol field with hybrid risers and flowline bundles


Key Design Considerations • Gross structural integrity (tension, pressure) • Riser interaction (clashing, interference and entanglement) • Fatigue (curvature and tension ranges)

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Local analysis – – – –

Gap span Flexlok stress analysis Corrosion fatigue Material compatibility

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Collapse On-Bottom Stability Upheaval Buckling

• Touch down point – –

Abrasion Local armour buckling (bird-caging)


Flexible versus Rigid Solutions FPSO Fixed Structure TLP / SPAR Semi-Sub “Dynamic”

“Static”

Niche Application - Dynamic Ideal for fast-track (EPS) Tested prior to Delivery

FLEXIBLE SOLUTION

Lowest installed costs

Flexible Flowlines Economic Short Lengths

Material Cost Technically straight forward

Long Export Lines Subsea Steel Step Catenary Outs Risers

Known Product

RIGID SOLUTION

High Installation Costs

Riser Towers

Naturally Insulating

High Mob / De-Mob

Congested Field Infrastructure Corrosion Resistant Re-Use

Lower flexibility (not re-usable) © Wellstream International Limited. Duplication in full or in part is prohibited.

Flowlines and Risers – Services and Products

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PRODUCTS Rigid linepipe Pipe coating Flexibles & Bundles Raw Materials; End fittings Ancillaries PLETs & PLEMs Pumps & Compressors Subsea support structures

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SERVICES Pipe & Riser Installation Project Management Design Fabrication Inspection Repair & Maintenance Remote Intervention Decommissioning

Approx. 50% of SURF spend is associated with flowlines and risers


Flowlines and risers

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