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Tow and installation

Hebron

The Hebron oil field is located approximately 93 meters of water, in the Jeanne d'Arc Basin offshore Newfoundland and Labrador, Canada, 340 kilometres southeast of St. John's.  Aker Solutions supported the construction, integration and offshore installation of the Hebron GBS platform, including deepwater mooring, topside mating, marine logistics and offshore installation.
Image of Hebron GBS in the ice offshore Canada
1
The challenge

The scope combined marine operations, installation of a nine-leg deepwater mooring system, topside mating and the tow and installation of an approximately 750,000-tonne platform. 

All operations had to be executed safely and reliably, supported by robust marine procedures, logistics and contingency planning for a manned tow and offshore campaign.

2
Our solution

Our solution comprised six elements:

  1. Float-up, mooring and float-out from dock of the gravity-based structure
  2. Installation of the nine-leg deepwater mooring system
  3. Construction support using barges, cranes, a batch plant, power solutions and crew transportation
  4. Topside deck mating
  5. Towing and offshore installation of the platform
  6. Offshore completion support

Integrated marine procedures and emergency-response planning supported the manned tow and offshore execution.

Aker Solutions also worked with partners to enable cutting of mooring chains without divers, using an ROV-operated subsea guillotine tool.

3
Outcomes

The integrated delivery model reduced interfaces and execution risk across the project phases, while improving operational reliability and schedule certainty in deepwater offshore conditions. 

The ROV-operated chain-cutting solution eliminated the need for divers during that part of the operation, reducing personnel exposure. The coordinated approach brought engineering, marine operations, logistics and offshore execution together to support the platform’s safe tow and installation.