FAQ

CAN has been proven to benefit:

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• Cost optimisation:

  • Reduces costs through reduced rig time for top-hole drilling and conductor installation

  • Creates a cost effective single/dual well template

• Risk mitigation:

  • Reduces risks on mobilisation, lifting and handling of heavy conductor pipe

  • Improves fatigue management and increased load carrying capacity

• Environmental footprint reduction:

  • Eliminates cuttings and cement disposal from conductor installation

  • Reduces CO2 and NOX emissions due to rig time reduction

• Technical enabler:

  • Enables shallow kick offs for shallow reservoirs

  • Solves the challenge of wellhead support in soft seabed conditions

Whether you are developing an exploration or production well, CAN has proven to save costs in the following ways:

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• Exploration

  • Removes 2-4 rig days from the schedule resulting in saved rig time

  • Simplified and more rig-efficient P&A

• Production

  • Reduced rig time / drilling scope

  • Onshore pre-mounting of SPS-equipment

  • Reduced project execution time

  • Accelerated first oil

  • Non-productive time risk reduction

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More about how CAN optimises drilling operations to save costs >

• Pre-installed conductors result in:

  • No risk of conductor equipment or cementing failure issues

  • Better control of inclination issues => (WOC / re-spud)

  • Better control of fatigue issues and related reduced operability

• Less equipment and services means:

  • No mobilisation or handling of spud bottom hole assembly & conductor equipment

  • No conductor cementing operations

  • No cementing crew for conductor, less bulk/equipment handling on the rig or supply vessel

  • Simplified and reduced rig time for P&A

• Reduction of ‘Open Water operations’ (= spud to running Riser/BOP)

  • Reduces risks of WOW, ROV and other NPT during spud

• Risk management according to the ALARP principle

• Reduced mobilisation and lifting/handling of heavy equipment (supply base, vessel & rig)

• Reduced environmental footprint

  • Reduced volume of cuttings requiring disposal

  • No cement or mud for conductor

• Proven functionality with Riserless Mud Recovery equipment

Exploration wells: 6-8 weeks

Production wells: 16-24 weeks (this is based on the assumption of 1-3 units, delivery time for more units available on request

To date CAN's have been manufactured in Norway and Indonesia, however the CAN is suitable for local content, if fit for purpose fabrication is available.

Projects to date have been carried out in water depths between 100 - 1500 m. Any depth limitations are set by the crane capacity. For more information about projects carried out to date, visit our track record.

Kick-off started at 10 m below the mudline for The Wisting Central II well, which is the first horizontal appraisal well in the Barents Sea. This well set a new drilling record as the shallowest horizontal offshore well drilled from a floating drilling facility.

You can find more information on the use of a CAN for the The Wisting Central II well on the track record page.

It is possible to install a CAN in a variety of seabed conditions and we use NGI (Norwegian Geotechnical Institute) for all geotechnical engineering to determine the suitability of the seabed for a CAN. NGI has performed geotechnical design and installation of more than 700 suction anchors globally, both for the oil and gas industry as well as for offshore wind.

To date most CAN installations have been performed in clay type formations:

• Clay 25 installations

• Soft calcareous limestone 1 installation

• Mixed layers of sand and clay 1 installation

• Sand 1 installation