q13a-a foundation installation o.j. dijkstra – engineering ... · • jacket/foundation...
TRANSCRIPT
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Q13a-A Foundation InstallationO.J. Dijkstra – Engineering Manager
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Q13a-A platform installation
Contents
• Q13a-A Amstel field history
• Project History
• Foundation Design
• Jacket/Foundation Installation
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Q13a-A location
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Q13a-A – Amstel field history
• Discovered in 1962
• 1984 – 1998 NAM
• 2000 – 2003 various licensees
• 2008: Delta Hydrocarbons / EBN B.V. becomes government
participant in the activities
• 2010: GDF SUEZ E&P Nederland B.V. becomes joint licensee
of Q13a
• 2011: exploration drilling by GDF SUEZ E&P Nederland
• 2013: installation of the platform
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Project history
• Suction Pile Foundation was part of the original license of Delta
Hydrocarbons
• License was taken over by GDF-Suez
• From well-head platform + production platform (SIP-2 concept) to
one full size oil production facility
• Jacket designer: Iv oil & gas
• Foundation designer: SPT Offshore
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How do Suction Pile installations work?
dischargedischargeof waterof water
• Lower SP to seabed• Self penetration• Discharge of water by pumping, causes
difference in water column inside and outside
• Driving force on the top-plate (10 tonne / m2 / bar)
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Suction Pile Design (geotechnical)
Design Aspects• Shallow/intermediate foundation• Capacity skin friction, moment &
torsion• Installation by differential pressure• API & DNV codes• Scour protection needed in non-
cohesive soils• Software 3D
• Plaxis FE
Suitable soils• Loose to dense sands• Soft to very stiff clays• Layered soils
zlow
R
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Suction Pile Design (structural)
Design Aspects• Installation Pressure differential• Shell buckling• Lifting design loads / lifting
equipment• Transport & Installation loads• In-place design loads• Corrosion protection• API, ISO & DNV codes• Selection of steel types• Software
• FEMAP/NX Nastran• SACS
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Design Process
Initial Substructure
Structural Model
Initial Foundation
Loads[Loop 0]
Suction Pile Sizes
Structural Integrity of Suction Pile
Soil Stiffness Matrix
Suction Pile Top-plate Stiffness
Detailed Substructure
Structural Model
Foundation Loads
[Loop 1…n]
ENDYES
NO
Suction pile sizes meet
requirements?
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Q13a-A platform foundation design (1)
Loads: Operational Boat Impact
Compression [MN] 16 20
Tension [MN] 0.3 4.3
Lateral [MN] 2.9 7.8
Moment [MNm] 6.8 23.2
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Q13a-A platform foundation design (2)
Description Depth ' Friction
angle,
Cohesion,
c'
E50,ref
(best est.)
Cone
resistance, qc
[m] BML [kN/m3] [°] [kPa] [MPa] [MPa]
Dense to very
dense SAND
0.0 - 2.0
10.5 35 0
80 0.0 - 13.0
2.0 - 5.5 70 13.0
5.5 - 8.0 90 25.0
> 8.0 55 Assumed 25.0
Note:
1. E50,ref is a reference stiffness modulus at a reference stress of 100kPa.
2. Young’s Modulus derived according to correlation Eoed = 3·qc ; E50 = 0.67·Eoed
Geotechnical parameters
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Q13a-A platform foundation design (3)
Geotechnical Design
Dimensions:- Diameter: 7.0m- Penetration: 6.9m
Vertical capacity by:- Shaft friction- End bearing
Under base grouting applied because of settlements requirements
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Q13a-A platform foundation design (3)
Installationcondition
In-Placecondition
Structural Design- Installation condition - Static In-Place condition- Fatigue life design
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Overall design result
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Gaz de France, Q13a-A, Platform Installation
• Operator/Client:
• Offshore installation contractor:
• Suction installation Sub-contractor:
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SPT Scope: Typical layout of the system
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Suction Pump Skid parameters
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Jacket on fabrication-yard NAMI
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Installation of Suction Pump Units and Umbilicals
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Commuting to your work
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Arrival of the Jacket and Topside on the barge
Suction Pump Unit
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Offshore Lift of the Jacket
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Suction Installation
It’s Nighttime
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Top side lift
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Foundation Job Done!