Marginal satellite study Noordzee

PROJECT MANAGEMENT ● ENGINEERING ● CONTRACTING

Iv-Oil & Gas

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DEVELOPMENT OF A MARGINAL SATTELITE FIELD


INTRODUCTION

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INTRODUCTION

… is investigating the feasibility to utilize a low cost option to develop satellite fields located in the Dutch Sector of the North Sea where the water depth ranging from 20 to 35 meters.

PHILOSOPHY:

• The design shall allow for re-use after field depletion

• Lifecycle cost shall always be considered

• Simple installation/de-installation methodology

• An ergonomic acceptable lay out

• Free water knock out

• Renewable energy

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INTRODUCTIONSTUDY OBJECTIVES

• Define a concept,

• Define a generic topside,

• Estimate topside weight and space requirements,

• Recommend a transport, assembly and installation method,

• Cover implementation aspects of project execution,

• Estimate capital expenditure.

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INTRODUCTIONSTUDY PARAMETERS

• Site data (20 to 35m water depth)

• Base process data (2 producing wells, 1.8 mln m3/d)

• Materials of construction (Duplex stainless steel)

• Utilities (Emergency diesel, solar cells and wind turbines)

• Emergency overnight shelter (4 persons)

• Design and fatigue life (20 years, Fatigue: x5, x10)

• Other (wire line operations, no crane)Iv-Oil & Gas

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SUBSTRUCTURES

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SUBSTRUCTURESINSTALLATION OPTIONS

• Crane barge installed with driven piles

• Installed by jack-up rig or construction barge

• Self installing

SUBSTRUCTURES

• Conventional multi-legged jacket

• Minimal braced tower jacket

• Conductor supported modular structure

• Monotower

• Self installing platformsIv-Oil & Gas

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SUBSTRUCTURESCRANE/BARGE INSTALLED - MULTILEGGED JACKET

Advantages

• Proven concept

• Supports all marginal topsides

• Can support work-over units

Disadvantages

• Requires heavy lift vessel

• Main pile jackets require field welds

• High installation costsIv-Oil & Gas

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SUBSTRUCTURESCRANE/BARGE INSTALLED – MINIMAL BRACED

Advantages

• Low weight

Disadvantages

• Requires heavy lift vessel

• Limited future expansion

• Jack-up rig required for work-over

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SUBSTRUCTURESRIG/BARGE INSTALLED – CONDUCTOR SUPPORTED

Advantages

• Cost effective

Disadvantages

• Topsides limited to 200 tonnes

• Permitting

Not to be pursued

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SUBSTRUCTURESRIG/BARGE INSTALLED – MONOTOWER

Advantages

• Low weight

• Protected conductors and risers

Disadvantages

• Cannot pre-drill wells

• Work-over requires drilling rig

• Limited topside weight

• Sensitive to dynamic motions fatigue additional bracingsIv-Oil & Gas

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SUBSTRUCTURESSELF INSTALLING – SIP I

Advantages

• Transport floating on suction piles

Disadvantages

• Separately installed topsides

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SUBSTRUCTURESSELF INSTALLING – SIP II

Advantages

• No lifting required at location• Docking over pre-drilled wells• Re-usable• Maximized onshore commissioning

Disadvantages

• Too large to be considered marginal• Larger deck width

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SUBSTRUCTURESSELF INSTALLING – SIP III

Advantages

• No heavy lift vessel• Docking over pre-drilled wells• Re-usable• Maximized onshore commissioning

Disadvantages

• Topside weight limited• Temporary frame required on barge

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SUBSTRUCTURESSELF INSTALLING – SIP IV

Advantages

• No heavy lift vessel• Docking over pre-drilled wells• Re-usable• Maximized onshore commissioning

Disadvantages

• Deck and substructure weight too high for a marginal concept

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SUBSTRUCTURESCONCEPT SELECTION

Installable without a heavy lift vessel

• Ability to support a 3-well 400 tonnes topside

• Low weight

• Minimum decommissioning costs

The SIP 3 concept satisfies the criteria of the study and therefore it is selected as the preferred substructure for this study.

Self installable

400 tonnes topside

Pre-drilling Relative weight in

35 m water

Low cost removal

Jacket No Yes Yes High No Braced tower No Yes Yes Low No Conductor sup No No Yes Low No Monotower No Perhaps No 30 m max No SIP 1 Yes No No Low Yes SIP 2 Yes Yes Perhaps High Yes SIP 3 Yes Yes Yes Low Yes SIP 4 Yes Yes Perhaps High Yes

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SIP 3

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SIP 3SIP 3 CONCEPT

• SPT patent

• Barge installed, fully pre-installed and commissioned

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SIP 3SIP 3 SUBSTRUCTURE

• 3.5 m OD mono column, 3 suction piles

• Horizontal mono column orientation for fabrication

• Upending of the mono column from horizontal to vertical

• Vertical (lifted) load out with the suction piles attached

• Installation of topside (substructure at quay / harbour floor)

• Vertical transportation of the total platform

• Suitable transportation barge

• Docking over existing pre-drilled wells

• Future abandonment and re-installationIv-Oil & Gas

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TOPSIDES

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TOPSIDESSIP 3 TOPSIDES

• Main deck

• Intermediate deck

• Top deck (helideck)

PROCESS

• 1.8 mln Nm3/d capacity

• MOC: 900# Duplex

• Free water Knockout (3 phase separation)

• Oil skimmer tank

• Clean water (<30 ppmv oil) overboard

• 10” pipelineIv-Oil & Gas

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TOPSIDESCONTROL, SAFETY AND SHUT DOWN

• Unmanned autonomous operating classification

• Control via fibre optics by means of a DCS extension of the host platform

• Gas detection and intruder alarm

• Rig connected deluge system (dry)

• H60 wall (E/I facilities and refuge)

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TOPSIDESENERGY

• 2400 watt energy consumption (unmanned mode)

• Renewable energy sources (wind turbines and solar)

WEIGHT

• Topsides : 340 tonnes

• Substructure : 860 tonnes

• Total : 1200 tonnes

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FABRICATION, TRANSPORT AND INSTALLATION

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FABRICATION

Fabrication at a facility which has unrestricted access to the North Sea.

• Delivery of mono column (rolled and pre-welded)

• Delivery of suction piles

• Fabrication substructure

• Integration of suction piles with the substructure

• Installation of sacrificial anodes

• Installation of SW pump, J-tube and riser inside columnIv-Oil & Gas

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TRANSPORT AND INSTALLATION

• Marine spread :

• Main tow tug 60-80 TBP• Assisting tug 40 TBP• Barge 300 – 400 ft

• Strand jacks (4 x 600 ton)

• Suction pumps (3 x)

• Hang-off frame (at stern of barge)

• Mooring winches (4 x allows for accurate manoeuvring)

• ROV spread (seabed survey and wellhead inspection)

• Survey & positioning spread (platform position monitoring)

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INSTALLATION OPTIONS

• Topside pre-installed at top of column, transport with barge SIP3, offshore lowered with strand jacks (1x jacking),

• Topside pre-installed at lower section of column, transport with barge SIP3, substructure lowered offshore using strand jacks, deck lifted with strand jacks (2x jacking),

• Topside installed at top of column, transport on barge, offshore single lift HLV/SSCV (1x lifting),

• Topside on barge, substructure on barge, offshore installation deck with sheerleg/HLV/SSCV (2x lifting),

• Transport topside on barge, substructure in hooks sheerleg (1x lowering, 1x lifting).Iv-Oil & Gas

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INSTALLATION

The installation of the platform consists of the following phases:

• Preparation phase

• Barge mooring

• Platform lowering

• Foundation installation

• Completion activities

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INSTALLATION

• Sea fastening of substructure to the barge using hydraulic pins for swift release of the substructure from the barge after mooring,

• Tow to the field using tugs,

• Transport positive range of stability more than 50 degrees (criterion > 36 degrees),

• Lowering stability (hydrostatic and hydrodynamic) provided by ballast on the suction piles,

• Lowering and lifting systems using strand jacks,

• Suction pumps for the installation and future removal of the suction pile foundation,

• No divers required for installation and removal of installation equipment.

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SCHEDULE

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SCHEDULEDEFINITION OF PROJECT PHASES

• Conceptual design

• Detail design

• Procurement

• Construction

• Onshore test/commissioning

• Transportation and installation

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SCHEDULECONCEPT PLANNING

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COST ESTIMATE

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COST ESTIMATEOVERVIEW

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Description FoB Fabrication Other Total

costs costs

(€·103) (€·103) (€·103) (€·103)

Substructure --- --- ---

Topsides structual steel --- --- ---

Helideck --- --- ---

Equipment (incl commisioning) --- --- --- ---

Design & Procurement --- ---

Fabrication and installation --- ---

Insurance --- ---

Certification --- ---

Overall contingency ~15% --- ---

Grand Total --- --- --- ---


END OF PRESENTATION

QUESTIONS?

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Marginal satellite study Noordzee