SemiSub Drilling Rigs

What is a semisub drilling rig?

A semi-submersible drilling rig or a semisub is a type of floating drilling rig that is partly submerged to provide station keeping and stability. It comprises a submerged hull typically pontoon-type columns joint together with the drilling platform by large tubulars. The main purpose of the semisub is to avoid large surge movements from wave by having the slender tubulars in the splash zone.

Semi-sub
Semisub Drilling Rig courtesy of Transocean

Semi-sub is a floating installation used for drilling, completion and well service on the Norwegian and international shelf. The lower structure of the rig consists of floating elements (pontoons). The pontoons have tanks that can be filled with water (ballast) so that the center of gravity of the rig becomes lower when operating on the well. This makes the rig stable in the sea. When the rig is to be moved, the ballast tanks are emptied so that it is easier to sail. This type of rig can be used on both shallow and deep water.

List of SemiSub Drilling Rigs

  • Viking Producer Rig owned by Viking Drilling ASA The Viking Producer drilling rig is owned by Viking Drilling ASA which can be contacted for jobs and careers on the Viking Producer. The Semisub is a Semisub type of rig and is designed as a CFEM Pentagone and built by at the Cfem LE Havre France shipyard. The rig can be operated in water ...
  • Transocean John Shaw Rig owned by Transocean Inc. The Transocean John Shaw drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean John Shaw. The Semisub is a Semisub type of rig and is designed as a Friede & Goldman 9500 Enhanced Pacesetter and built by Mitsui at the Japan shipyard. The rig can ...
  • Transocean Leader Rig owned by Transocean Inc. The Transocean Leader drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Leader. The Semisub is a Semisub type of rig and is designed as a Aker H-4.2 and built by Hyundai Heavy Ind. at the Hyundai Ulsan Korea shipyard. The rig can be operated ...
  • Transocean Legend Rig owned by Transocean Inc. The Transocean Legend drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Legend. The Semisub is a Semisub type of rig and is designed as a Trosvik Bingo 3000 modified and built by Nippon Kokan at the Japan shipyard. The rig can be operated in ...
  • Transocean Marianas Rig owned by Transocean Inc. The Transocean Marianas drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Marianas. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 700 Series Enhanced and built by AMFELS at the Brownsville, TX shipyard. The rig can be ...
  • Transocean Polar Pioneer Rig owned by Transocean Inc. The Transocean Polar Pioneer drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Polar Pioneer. The Semisub is a Semisub type of rig and is designed as a Hitachi Zosen HITACHI ARCTIC and built by Hitachi Zosen at the Japan shipyard. The rig can be ...
  • Transocean Prospect Rig owned by Transocean Inc. The Transocean Prospect drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Prospect. The Semisub is a Semisub type of rig and is designed as a Trosvik Bingo 3000 modified and built by Nippon Kokan at the Japan shipyard. The rig can be operated in ...
  • Transocean Rather Rig owned by Transocean Inc. The Transocean Rather drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Rather. The Semisub is a Semisub type of rig and is designed as a Gotaverken GVA 4500 Enhanced and built by Daewoo Shipbuilding at the Okpo Korea shipyard. The rig can be operated ...
  • Transocean Richardson Rig owned by Transocean Inc. The Transocean Richardson drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Richardson. The Semisub is a Semisub type of rig and is designed as a Gotaverken GVA 4500 Enhanced and built by Daewoo Shipbuilding at the Okpo Korea shipyard. The rig can be operated ...
  • Transocean Searcher Rig owned by Transocean Inc. The Transocean Searcher drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Searcher. The Semisub is a Semisub type of rig and is designed as a Trosvik Bingo 3000 and built by Kaldnes Mek Verkstad at the Tonsberg Norway shipyard. The rig can be operated ...
  • Transocean Winner Rig owned by Transocean Inc. The Transocean Winner drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Winner. The Semisub is a Semisub type of rig and is designed as a Gotaverken GVA 4000 and built by Gotaverken Arendal at the Sweden shipyard. The rig can be operated in water ...
  • Sovereign Explorer Rig owned by Transocean Inc. The Sovereign Explorer drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sovereign Explorer. The Semisub is a Semisub type of rig and is designed as a Gotaverken GVA 4000 Enhanced and built by Cammell Laird at the UK shipyard. The rig can be operated in ...
  • Transocean Amirante Rig owned by Transocean Inc. The Transocean Amirante drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Amirante. The Semisub is a Semisub type of rig and is designed as a Aker H-3 Modified and built by Framnaes Mek Verkstad. The rig can be operated in water depths of 3,500 ft ...
  • Sedco 700 Rig owned by Transocean Inc. The Sedco 700 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 700. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 700 Series and built by Levingston Shipbuilding at the Levingston Orange TX shipyard. The rig can ...
  • Transocean Arctic Rig owned by Transocean Inc. The Transocean Arctic drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Arctic. The Semisub is a Semisub type of rig and is designed as a Marotec AS Marosso 56 design and built by Mitsubishi at the Hiroshama, Japan shipyard. The rig can be operated ...
  • Sedco 702 Rig owned by Transocean Inc. The Sedco 702 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 702. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 700 Series and built by Avondale Shipyards at the Avondale New Orleans LA shipyard. The rig ...
  • Transocean Driller Rig owned by Transocean Inc. The Transocean Driller drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Transocean Driller. The Semisub is a Semisub type of rig and is designed as a Friede & Goldman L-1033 Enhanced Pacesetter and built by Astano Shipyard at the Ferrolspain shipyard. The rig can be ...
  • Sedco 703 Rig owned by Transocean Inc. The Sedco 703 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 703. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 700 Series and built by Avondale Shipyards at the Avondale New Orleans LA shipyard. The rig ...
  • Sedco 704 Rig owned by Transocean Inc. The Sedco 704 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 704. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 700 Series and built by Hawker Siddley at the Halifax Nova Scotia shipyard. The rig can ...
  • Sedco 706 Rig owned by Transocean Inc. The Sedco 706 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 706. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 700 Series and built by Kaiser Steel at the Kaiser, San FRanCISCO, CA shipyard. The rig ...