Henry Goodrich

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Henry Goodrich

The Henry Goodrich is a SONAT-Mitsu SES5000 semisubmersible drill rig currently owned by Transocean. It was built in 1985 by the Mitsu Tamano Engineering & Shipbuilding Co. shipyard, Tamano, Japan. The Henry Goodrich is named for the former CEO of SONAT's parent company (Southern Natural Resources), Henry Calvin Goodrich.



At the time of construction, the Henry Goodrich was the worlds largest semisubmersible drill rig. It was delivered in July 1985, with the option for a DP system to be later added. The large rig was noted for it's harsh weather capability: suitable for Alaskan, Norwegian or Canadian waters. Safety was a prime consideration, being finished only a few years after the Ocean Ranger loss in harsh weather conditions.


The Henry Goodrich was initially registered in the United States, and classed with DNV. It was also designed to meet the requirements of:

  • Canadian Coast Guard
  • Canadian Oil and Gas Lands Administration
  • Norwegian Maritime Directorate
  • Norwegian Petroleum Directorate
  • IMO
  • United Kingdom Department of Energy
  • United Kingdom Department of Trade
  • US Coast Guard


The Henry Goodrich is a four-column, twin-pontoon semi-submersible. The columns have horizontal trusses. The upper works are watertight, providing reserve bouyancy as a safety feature. The columns have been designed with ice considerations in mind. Column bracings are in redundant pairs, maintaining strength in event of damage to one. Use of high-strength, low-temperature steels, continuous structures, and faired connections have been extensively employed to reduce stress concentrations and fatigue. The rig made extensive use of FEA analysis (particularly for the early 1980's).


Accommodations are provided on two decks of the upper hull. Amenities include a gym, sauna and theatre. These decks are underslung, providing ample natural lighting and straight-forward access to the free fall lifeboats. Work areas are accessible by enclosed passageways. Rig motions were studied through model testing to reduce motions at sea.

Off Newfoundland

It has particular importance to the Newfoundland offshore industry, where it drills alongside the GSF Grand Banks. The Henry Goodrich is currently under contract with Husky to drill wells in both the Terra Nova Field and White Rose project[1].


Envionmental Conditions - Standby

  • Wind: 60 knots
  • Wave: 10.7 m significant (18.3 m max.)
  • Currents: 2 knots

Envionmental Conditions - Survival

  • Wind: 100 knots
  • Wave: 17.0m significant (33.5m max.)
  • Currents: 2.5 knots
  • Designed for a 100 year storm.

External Links

  • Current Location [2]
  • TransOcean Entry [3]
  • DNV Entry [4]
  • RigZone Entry [5]
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