EPRD of Ten Platforms Out of the

Greater Ekofisk Area

Jan Gravekamp, Heerema Marine Contractors

Ekofisk I Cessation Project Engineering, Preparation, Removal and Disposal

(EPRD) of Platforms

Decommissioning Conference St.

Andrews

08 October 2014

3

Presentation topics

Schedule & Execution Principle

Scope of Work EPRD

HSE

Newly Developed and Implemented Technologies

Disposal

Success Criteria/Lessons Learnt

Lessons Learnt

SSCV Optimization Solutions

4

Schedule & Execution Principle (Ekofisk EPRD)

Offshore Execution in 4 phases

1 Platform Visits (helicopter)

2 Make Safe

3 Topsides Removal

4 Jacket Removal

Subsea

inspections

by ROV’s

Topsides

hook down

and removal

One Vessel approach

Flexible Removal Schedule - Defined Milestones

Schedule & Execution Principle Topside Removal

Reversed Installation

Transportation on SSCV Deck avoiding barges and minimising weather

risk

5

6

Schedule & Execution Principle Jacket Removal

Jackets (Launch Jackets)

Two Pieces, Horizontal Split

Single Piece

7 7

EPRD Contract Scope of Work 2007-2014

Albuskjell

1/6A

Albuskjell

2/4F

COD 7/11A West Ekofisk

2/4D

Ekofisk 2/4R

EDDA 2/7C

Norpipe

37/4A

Norpipe

36/22A

Ekofisk 2/4P Total removed 120.000 mT

Ekofisk 2/4W

Ekofisk

2/4Q

8

Main Parties Involved

Client :

Main Contractor EPRD :

Subcontractors :

London Marine

Consultants

HSE

Safety Records 2008-2014:

- ~ 3.200.000 Offshore manhours involved

- 11 Medical Treatment Cases

- 24 First Aid Cases

- ZERO LTI’s!

All work has been executed with the highest focus

on Safety

9

HSE Focus Areas throughout EPRD Project

Onshore Preparations:

Focus on Working conditions

Safety Booklets

Incident Injury Free Trainings

Organization

Safety Roadshow with subcontractors

Risk sessions

Lessons learned after each campaign and implementing

of Lessons Learnt

Offshore:

Quantitative HSE Measurements

Crew Information sessions

Permit to Work

Barrier Management

Use of the right PPE

Health monitoring program

10

Newly Developed and Implemented Technologies

Single Piece Jacket Lift

«To pin or not to Pin»

- Subsea pinning of main piles to jacket legs

- Subsea Drilling tool

11

Disposal

AF Offshore Decom Yard Vats:

Deepwater Quay

Drainage Control System

Equipment development

Dust Control

Hot Cutting Control

Marine growth Issues

Environmental Monitoring Program

Hazardous Waste management

Recovery Rate 97%

12

13

Success Criteria/Lessons Learnt

Smooth offloading operations at Vats:

- Site moves – schedule flexibility – quay availability

Motivated & dedicated project teams

- Organisation split Hookdown/disposal and R&T

- Platform Construction manager offshore

- Good cooperation and open communication

- three main parties; COPSAS, HMC, AFD

Safe and efficient execution within schedule

Expect the unexpected

Long term relationship subcontractors – “good

building block”

Continuous HSE focus is a must

Lessons Learnt

14

4 Phase execution Philosophy - successful and efficient

- Robust basis for “expecting the unexpected”

Innovative Solutions :

- Single piece jacket lift

- Pinning operation

- Cutting tools very reliable

“One-Vessel” approach

- Multitasking: Hook-Down – Removal – Subsea

- Accommodation

Reverse Installation - proven efficient

- Ample crane capacity

- Minimizes offshore construction

- Limits environmental risks

- Increased workability - transported on board the crane vessel

SSCV Optimization Solutions

Use of existing platform facilities from which

Hookdown can be carried out

Accommodation

Cranes

Make use of existing Platform utilities where

possible e.g. firewater, Power supply, compressed

air etc.

OSV for Jacket inspection work and Jacket

preparation work

15

16

Decommissioning is challenging and ground

breaking

Thank you for your

attention