Sea-Quester cutting edge technology

Using the Pivotree in combination with a compressed gas transport vessel, modified to store CO₂ (the Carbon Harvester), Sea-Quester solves the transport problem for offshore carbon sequestration by eliminating costly pipelines and permanent offshore facilities with a highly functional, minimal footprint, technology solution.

The system consists of:

  • The Pivotree
    a subsea mooring and production tree that simultaneously provides well access for injection and flow control with a structural mooring for 360-degree vessel station-keeping.

  • The Carbon Harvester
    a Handysize vessel providing a floating facility featuring gas treatment, compression, storage, and propulsion.

Sea-Quester has secured the worldwide exclusive rights to intellectual property in the Pivotree technology, underpinning the value proposition set out below.

Value proposition

Safe and reliable operation

The system is designed in accordance with all relevant international codes and standards, and has all the safety features and operational functionality of larger systems.

Flexibility in choice of reservoir

Nimble and unconstrained by location and the huge capital expense of pipelines, the system facilitates a broad reach to reservoirs with optimal geological characteristics for carbon storage.

Reduces time to deployment

The system takes less than half the time to procure, construct, and deploy compared to conventional offshore CCS development concepts.

Redefines “minimal facilities”

Conventional field development elements, such as pipelines, platforms, moorings, flowlines, umbilicals, or manifolds are no longer required to dispose of the captured CO₂. This vastly reduces the capital required for offshore sequestration.

Designed for reuse

The equipment is designed for a 15-year service life, with all subcomponents that are designed for wear or are subject to high failure rates being replaceable in field. Estimated operating costs are in the lowest quartile for offshore production operations.

Increased Societal Acceptance

Community objection to onshore CCS projects has resulted in some onshore CCS projects in Europe being blocked. Offshore sequestration allows for the selection of the optimal reservoir and minimises the interference with other stakeholders.

Lowest physical footprint

The Pivotree’s physical footprint is less than 16m2 – when the injection well is plugged and abandoned, there is nothing left on the seabed. Abandonment cost and risk are the lowest of any competing system.

Problems we solved

Using the Pivotree in combination with a compressed gas transport vessel modified to store CO (the Carbon Harvester), Sea-Quester solves

many issues that can inhibit the development of large scale offshore carbon sequestration using conventional pipeline technology.

Such issues include:

  • Elimination of expensive and technically challenging shore crossings (HDD or trenched),

  • Elimination of secondary stabilisation for pipelines in nearshore areas (such as trenching or rock dumping),

  • Reduction of environmental impact (reef, seagrass, sea life),

  • Elimination of pipeline crossings over other existing infrastructure,

  • Elimination oflicenses, land access agreements, or other permissions required for pipelines to traverse over areas used by other stakeholders. others permits

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