Marine Platform and Pipeline Decommissioning
Integrated Engineering, Equipment & Execution for End-of-Life Offshore Assets
With years of hands-on offshore construction experience, OCS is uniquely positioned to deliver turnkey decommissioning solutions for marine platforms and subsea pipelines. Unlike traditional equipment rental companies or purely engineering consultancies, OCS is uniquely positioned to provide the full spectrum of services: engineering, construction management, strategic tooling, and offshore execution.
Our decommissioning services are built on the foundation of OCS’s proven marine construction DNA. From concept studies and regulatory compliance to safe and efficient field execution, we combine in-house tools, technical expertise, and project experience to offer constructible, cost-effective solutions to operators and contractors.
In-House Strategic Decommissioning Equipment
OCS owns and operates a wide range of specialized subsea decommissioning tools that enable us to respond rapidly and perform with precision across complex decommissioning scopes:
Cutting Systems
- Internal High-Pressure Abrasive Suspension Cutters
- 16” to 42” Pipe Cutting Head (PCH)
- Multistring: 7” DCH-1 (expandable to DCH-2 and DCH-4)
- 30” to 72” Dual Cutting Head DCH-3
- External Cutting Tools
- Chain Manipulator System for piles, conductors, jacket legs, and braces
- Diamond Wire Cutters (DWC) – 14” to 38” with extendable capacity up to 60”
Lifting & Extraction Tools
- Internal Lifting Tools (ILTs)
- 24” – 42”ILT – used for smaller diameter piles and conductors. This can also be used in pipeline recovery. Weight = 3mT. Working load limit = 330mT
- 30”– 54” ILT – used for larger diameter piles and conductors. Weight = 4.4mT. Working load limit = 500mT
- 4.0 meter ILT – this is used for monopile and wind tower foundation lifting. Weight = 40mT. Working load limit = 850mT.
Pile Soil Plug Removal Tools
- Jet Airlift Systems
- This is used for sandy and soft soil conditions.
- Equipped with high-pressure jetting pumps and compressors for efficient soil plug evacuation and pile cleaning prior to cutting or removal
- Drilling Off The Boom
- This is used for very dense soil or rocky conditions.
- The spread consists of drill string, bottom hole assembly, roller cutters, power swivel, hydraulic power pack, tongs and make up assembly.
Drilling & Preparation Equipment
- Dual Drilling Unit (DDU)
- Covers 16” to 36” pile drilling and is extendable to 43” to 60”
- Used for pile severance in high-resistance or damaged structures
Recent Decommissioning Projects
| Year | Client | Project/Location | Scope of Work |
|---|---|---|---|
|
2025 |
Algihaz (Awarded) |
CRPO 135 Zuluf Field / Saudi Arabia |
Provision of internal and external pile cutting tools – 30-60” DWS & DCH-3 for 4 nos. x 48” OD and 2 nos. x 42”OD |
|
2024 |
McDermott |
KGD98/2 CPP T&I |
External Pile Cutting of CPP Jacket – 12 nos. x 96” OD. x 60mm WT. Piles; LQUP Jacket – 8 nos. x 96” OD. x 60mm WT. Piles; Flare Jacket – 6 nos. x 96” OD. x 60mm WT. Piles and Buoyancy Tank – 6 nos. x 1500mm OD. x 35mm WT. Stubs |
|
2024 |
McDermott |
SFNY 242 Jacket Removal |
Soil Plug Removal and Internal Pile Cutting of 4 nos. x 30” OD. x 2” WT. Piles of SFNY-242 Jacket |
|
2023 |
InterMoor |
Pattani FSO, SPM1 & SPM2 Disconnection / Thailand |
Soil Plug Removal and Internal Pile Cutting of 6 nos. x 48” OD. x 0.75” WT. Mooring Piles of Single Point Mooring 1 |
|
2023 |
Esso Australia |
Bass Strait Small Diameter Pipelines and Umbilical Removal / Australia |
Provision of Conceptual Study for Decommissioning of Small Diameter Pipelines and Umbilical |
|
2023 |
Sapura Offshore Sdn Bhd |
SBM Pipeline Rejuvenation Phase II / Singapore |
Removal of Nearshore Section of 48” Pipeline |
|
2023 |
Timas Suplindo |
Bronang Project Development / Indonesia |
Provision of Diamond Wire Cutter for Rectification of Bawal Pipeline and Hang Tuah Spool |
|
2022 |
PTTEP |
B6/27 Nangnuan Offshore Asset Decommissioning |
Provision of FEED Decommissioning study |
|
2022 |
Santos |
KPS Rationalisation FSO |
Provision of FEED Decommissioning study |
Why OCS for Decommissioning?
OCS is not simply a service provider—we are an engineering-powered marine contractor with an operational mindset. Every project is supported by our multi-disciplinary engineering team, our strategic equipment spread and our project execution managers—most of whom have deep-field experience in oil & gas and marine operations.
Our value proposition lies in our ability to:
- Integrate fit-for-purpose engineering with constructability reviews
- Mobilize rapidly with owned, tested, and certified subsea tools
- Offer clients a single-source solution from feasibility to field execution
- Reduce interface risks and enhance HSE compliance through end-to-end control
OCS is committed to helping clients retire offshore assets safely, efficiently, and responsibly—with minimal environmental impact and maximum value recovery.
Ready to discuss your next decommissioning campaign?
Talk to our experts to find a tailored solution.
