A Novel Installation Method Deepwater Conductors Miller...Marine Construction & Engineering...
Transcript of A Novel Installation Method Deepwater Conductors Miller...Marine Construction & Engineering...
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A Novel Installation Methodfor Deepwater Conductors
1Tuesday, April 8th, 201417:00‐17:20
Marine Construction & Engineering Deepwater DevelopmentsMadrid, Spain
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TLP, Offshore
• Field layout and target spec• Jetted conductors – review• Driven conductors – review • Installation methodology• Obstacles and solutions• As installed condition• Conclusions
Overview
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24 m36 m
9% Grade
Field layout & target spec
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15 @ 60 m x 914mm x 38mm WT – 60T5 Templates
±10cm1 deg
Horizontal
Inclination Tolerance
Stick‐up Tolerance
1182m Water Depth
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Jetted conductors ‐ review
+ Very mature method+ Very long conductors address capacity uncertainty
– Reduced soil cohesion– Reconsolidation time varies– Susceptible to shallow flow (Ursa)– Long rig‐time hold – costly– Settles if hold period is too short– Imprecise AS‐BUILT well coordinates
ADVANTAGES / CHALLENGESADVANTAGES / CHALLENGES
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Driven conductors ‐ review
+ Mature driving technology (pre‐1900)+ Batch‐set cost benefits+ Affordable installation vessels+ Precise control of final position+ Short installation time+ Use shorter conductor for same soils– Experienced installers are few– Specialized equipment (Hammer, STS, shuttle system)
ADVANTAGES / CHALLENGESADVANTAGES / CHALLENGES
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Installation methodology
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Installation methodology
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Project resources
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Equipment onboardTP‐1
TP‐2
TP‐3
TP‐4TP‐5
TP‐6
TP‐7Working Zone
Acoustic Positioning SystemAcoustic Positioning System
Deepwater Subsea HammerDeepwater Subsea Hammer
• MENCK 270kJ• Up to 3000m WD
• LBL Array• 7 Compatts
Shuttle SystemShuttle System
STS HeadSTS Head
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Installation procedureTripod
with
Com
patt x7
Logistics
Installatio
n
1. Deploy LBL array1. Deploy LBL array 2. Deploy 5 templates2. Deploy 5 templates
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Installation procedure3. Deploy Conductor3. Deploy Conductor
4. Self‐weight penetration4. Self‐weight penetration
Verticality
Che
ck
Guide
Con
e
5. ROV Suction Penetration5. ROV Suction Penetration
Suction at STS Head
Pressure gau
ge
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Installation procedureDetache
d STS Head
Ope
n guide cone
s
6. STS & template recovery6. STS & template recovery
Driv
ing complete
Land
ham
mer
7. Batch hammering7. Batch hammering
Spider Too
l and
Com
patt
8. Final as‐laid survey8. Final as‐laid survey
Self‐weight• Avg: 14.4m (~26%)• Min: 13.0m• Max: 15.4m
Suction• Avg: 16.3m (~29%)• Add: +2.0m (~3.6%)• Min: +1.5m• Max: +2.8m
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As‐installed condition
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• Any subsea installation• Immediate capacities known•Meet strict location spec• Precise stick‐up control
Conclusions• Time savings
• Work begins immediately• Off Rig critical path
• Less soil disturbance
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Novel Installation Method for Deepwater ConductorsPresenting Author:
Jonathon Miller([email protected])
Co‐Authors:Michael O’Driscoll
João Ruiz Ariel de Silvio
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