.

Decommissioning Yard, Esbjerg. Site visit photo. 17.01.2007

DECOMMISSIONING OF OFFSHORE PLATFORMS IN THE DANISH NORTH SEA REGION.

- RAVI SHANKAR

.

Decommissioning of offshore platformsEsbjerg, Denmark.

Anders Schmidth Kristensen

Allan Christensen

Gitte Moestrup

Mogens Møller Hansen

.

Contents

• Introduction• Management• Platform description• Decommissioning yard description• Transport• Scrapping• Recommendations

.

Given Task

To design an onshore yard at Esbjerg harbour location for recycling of abandoned oil and gas offshore platforms at North sea.

The project shall minimum focus on the following:1. Platform decommissioning activities in North sea oil and gas sector.2. Study, design and discuss about the possibilities to transport the abandoned

offshore platforms to shore for recycling. 1. Onshore scrap yard design for decommissioned structures.2. Handling of oil and gas structures at decommissioning yard.3. Environmental concern.

Given Data

1. Decommissioning of offshore platforms located at Danish North sea waters.2. Regional convention: OSPAR 98/3.3. Esbjerg demolition yard plan.4. Handouts of conferences held by Offshore Center Denmark on Decommissioning

of offshore structures in Esbjerg, Denmark.5. Company contact sources – Offshore Center Denmark, Rambøll and Uniscrap.

.

Decommissioning yard, Esbjerg.

.

Contents

• Introduction• Management• Platform description• Decommissioning yard description• Transport• Scrapping• Recommendations

.

Management

What to be done at

Onshore? 3

How to Transport?

2

What to be done at

Offshore? 1

BPEO

BPSO

BPFO

BPPO

Management Options

Documents

Client/

Contractors

Funds

MMM

Resource Options

OSPAR 1998/3 DEPA IMO

Planning Supply Forecasts

Perm

itting a

nd R

egula

tory

fra

mew

ork

Conven

tions a

nd S

tandard

s

Platform Decommissioning

Technical, Managerial issues

Engineering and construction

Site clearance and Restoration

Initia

l Phas

e Financial, Managerial issues

Track 2

1. Pre-planning, Post-planning 2. Supply chain, Stock 3. Forecast, Revisions

Track 1

1. What to be done at offshore? 2. How to transport? 3. What to be done at onshore?

Final

Phas

e

Management

What to be done at

Onshore? 3

How to Transport?

2

What to be done at

Offshore? 1

BPEO

BPSO

BPFO

BPPO

Management Options

Documents

Client/

Contractors

Funds

MMM

Resource Options

OSPAR 1998/3 DEPA IMO

Planning Supply Forecasts

Perm

itting a

nd R

egula

tory

fra

mew

ork

Conven

tions a

nd S

tandard

s

Platform Decommissioning

Technical, Managerial issues

Engineering and construction

Site clearance and Restoration

Initia

l Phas

e Financial, Managerial issues

Track 2

1. Pre-planning, Post-planning 2. Supply chain, Stock 3. Forecast, Revisions

Track 1

1. What to be done at offshore? 2. How to transport? 3. What to be done at onshore?

Final

Phas

e

Management

What to be done at

Onshore? 3

How to Transport?

2

What to be done at

Offshore? 1

BPEO

BPSO

BPFO

BPPO

Management Options

Documents

Client/

Contractors

Funds

MMM

Resource Options

OSPAR 1998/3 DEPA IMO

Planning Supply Forecasts

Perm

itting a

nd R

egula

tory

fra

mew

ork

Conven

tions a

nd S

tandard

s

Platform Decommissioning

Technical, Managerial issues

Engineering and construction

Site clearance and Restoration

Initia

l Phas

e Financial, Managerial issues

Track 2

1. Pre-planning, Post-planning 2. Supply chain, Stock 3. Forecast, Revisions

Track 1

1. What to be done at offshore? 2. How to transport? 3. What to be done at onshore?

Final

Phas

e

.

Decommissioning Stages, Start – End

BPEO

BPSO

BPEO

BPSO

BPMO

Develop Decommissioning Options

Govt. Approval

Proceed to Decommissioning

Options

Yes

No

Reject/ Wait

Ready for offshore

operations

Remove structures

Transport ashore

Ready with setup at

shore yard

No

Reject/ Wait

Dismantle, Re-use or burry onland

Yes

Reject/ Wait

Yes

No

STOP

START

Collect information

Put to

database

Approve

Deliver

Process

Standards Specification Documents

.

Decommissioning Stages, Start – End

BPEO

BPSO

BPEO

BPSO

BPMO

Develop Decommissioning Options

Govt. Approval

Proceed to Decommissioning

Options

Yes

No

Reject/ Wait

Ready for offshore

operations

Remove structures

Transport ashore

Ready with setup at

shore yard

No

Reject/ Wait

Dismantle, Re-use or burry onland

Yes

Reject/ Wait

Yes

No

STOP

START

Collect information

Put to

database

Approve

Deliver

Process

Standards Specification Documents

.

Contents

• Introduction• Management• Platform description• Decommissioning yard description• Transport• Scrapping• Recommendations

.

Danish platforms

.

Platform decommissioning methodology

Footings / Roots to stand

Tower / Trunk to support

Topsides / Crown to rest

.

Platform description

Sign Name of ModuleConventional

platformTripod type

platform

M1 Wellhead module Yes Yes

M2 Process module Yes Yes

M3 Utility module Yes Yes

M4 Power generation Yes Yes

M5 Drilling module Yes No

M6 Control room Yes No

M7 Accommodation Yes No

M8 Helideck Yes Yes

M9 Flare boom Yes Yes

M10 Drilling derrick Yes No

M11 Cellar decks Yes No

.

Platform materials

Modules Example

Jacket structure Zn, Al anodes, steel, concrete

Process facility module Crude oil, methanol, Ba, St

Drilling module Drilling fluids, bentonite

Utility moduleSteel, oil products, H2S and O2

scavengers

Power generation module Transformer oil, lubricating oil

Control roomPCBs, electrical wiring cu,

plastics

Accommodation moduleRefrigerator, textiles, furniture,

floor

Helideck Jet fuel

Flare boom Dead weight, steel

OthersProtection walls, storage

chemicals

.

Contents

• Introduction• Management• Platform description• Decommissioning yard description• Transport• Scrapping• Recommendations

.

Esbjerg decommissioning yard, Denmark.Site visit photo: 17.01.2007

.

Contents

• Introduction• Management• Platform description• Decommissioning yard description• Transport• Scrapping• Recommendations

.

Transport options- OCD

1 2

.

Contents

• Introduction• Management• Platform description• Decommissioning yard description• Transport• Scrapping• Recommendations

Scrapping process

SCRAP WASTE

Ferrous Non Ferrous Non metals

Ex: Fe, others. Ex: Cu, Br, Al, Zn, Mg etc.

Ex: Plastic, PVC, Rexinetc.

Ex: WEEE, PCBs, etc.

FRAGMENTATION

RECOVERY OPERATION

- Uniscrap

.

Scrap materialsSteel, DKK/Kg

16.5

134

11

6

Rust free steelRust free Stainless steelElectric motorEl cable - 36 to 38% CuEl cable - 50 to 60% Al

Aluminium, DKK/Kg

12

9

10 7

12

Aluminium blanksAluminium roller, cylinderAluminium alloysAluminium chips, flakesOffset

Brass, DKK/Kg

29

21

27

19

17

New Brass cutsOld Brass polishedOld Red Brass, high Cu%Old Cu/Br CoolerOther Brass

Copper, Zinc and Brass, DKK/Kg

38

3131

16

61.5

Copper el. Wire, balnksCopper 95%Copper electrodeOld ZincOld LeadTruck batteries

- Dansk Genbrug

.

Contents

• Introduction• Management• Platform description• Decommissioning yard description• Transport• Scrapping• Recommendations

.

Standards and documentsStandards

• ISO• DNV• API• DS

Collect information

Put to

database

Approve

Deliver

Process

Standards Specification Documents

???

Conventions

• OSPAR• BASEL• LONDON• HELSINKI• SOLAS

Organizations

• DEPA• DMA• IMO• ILO

Acts

• SSA• MEA• DWEA

.

Decommissioning options

• Lift >= 2500 Tones.Jack up rig or Derrick barge or HLV.Hiring during idle conditions.

• Transport Floating Barge.Danish North sea region.Hiring during idle conditions.

• Re-use Standards and inspection.Initial approved officials.

- Ex. DNV, API.

• Recycling What Standards and procedures?Contrast to Ship and Car recycling experience.Vendors – Ex. Uniscrap A/s.

.

Decommissioning options

• Demolition Open air dismantling.Ex. H J Hansen A/s.

• Burry onshore Ex. Kommunikemi A/s.

• Greenpeace Avoid manual Recycling.Switch to Green Recycling.