Subsea Containment Toolkit | Controlled Flow Response System

Controlled flow solutions - subsea containment toolkit for complex well incidents

When a capping stack alone cannot shut in a well, OSRL’s containment toolkit offers a critical solution. Designed to redirect hydrocarbons from the wellhead to a capture vessel, it forms part of a subsea containment system that enables safe, controlled flow to the surface for processing, storage, or disposal.

Hydrocarbons flow from the capping stack through a flexible jumper to a flowline end termination (FLET), continue via a flexible flowline and flow-spool assembly into a standard well testing riser, and ascend to a mobile offshore drilling unit (MODU). Here, well fluids are processed through standard surface well testing equipment. Selected transfer pumps, incinerator pumps, and coolers form part of the toolkit and help stabilise the flow prior to offloading to a tanker stationed at a safe distance.

To maintain flow assurance, hydrate inhibitors can be injected via coiled tubing deployed from a marine vessel. This chemical is delivered to the chemical distribution assembly (CDA), then onto the FLET and capping stack via a coiled tubing termination head (CTTH).

All components are stored at strategic global locations for rapid deployment. Three sets of flexible subsea jumpers and flowlines - non-airfreightable - are located in the UK, Brazil, and Singapore. The remaining sea and air-transportable components are stored in the UK, Norway, and the USA, maintained in a response-ready state.

Global deployment capability

Strategically stored in key international hubs, allowing swift mobilisation anywhere in the world.

Industry-standard compatibility

Interfaces with widely available well test equipment and a variety of MODUs to simplify operational readiness.

Designed for complex subsea scenarios

Supports operations up to 3,000m depth with high tolerance to temperature, H₂S, and CO₂ content.

Interactive 3D equipment models

Select the equipment below to find out more and explore the interactive 3D models of its set-up.

Subsea Well Containment Toolkit

The Subsea Well Containment method safely diverts flow when a well cap can't shut in, using specialised equipment to create a temporary subsea production system.

Key facts

Usable with a wide range of Mobile Offshore Drilling Units (MODUs) as capture vessels
Compatible with standard available well test equipment
Stored in strategic locations around the world to facilitate timely response

Containment FAQs

: It enables the controlled capture and redirection of hydrocarbons from a subsea well to a MODU when the well cannot be shut in by a capping stack alone.
: Flexible flowlines and jumpers are stored in the UK, Brazil, and Singapore. All other components are stored in the UK, Norway, and the USA, ready for air or sea freight.
: The system is designed to integrate with a wide range of Mobile Offshore Drilling Units (MODUs) and standard well testing equipment.
: Hydrate inhibitors can be injected into the system using a coiled tubing spread, ensuring continuous and stable flow in deepwater environments.
: Access to the containment toolkit is available through OSRL’s subsea capping (and OIE) and containment service, offered as part of our enhanced membership coverage.

With decades of subsea spill response experience, we offer the technical assurance and logistical reliability needed in the most demanding environments.

Our Containment Toolkit, developed in collaboration with industry partners, reflects our commitment to operational excellence and environmental protection.

We’ve proven its readiness through extensive integration testing and deployment exercises in multiple regions. As a member-driven organisation, our solutions are aligned with real-world challenges. Our regional storage model ensures that wherever a subsea incident occurs, the right equipment can be deployed quickly - minimising downtime and maximising control. With OSRL, you're not just getting equipment - you’re gaining a trusted partner in crisis.

Get In Touch For More Information About Containment

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Containment