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 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 ...
  • 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 ...
  • Sedco 709 Rig owned by Transocean Inc.
    The Sedco 709 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 709. 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 710 Rig owned by Transocean Inc.
    The Sedco 710 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 710. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 700 Series and built by Mitsui at the Tamano Japan shipyard. The rig can be operated ...
  • Sedco 711 Rig owned by Transocean Inc.
    The Sedco 711 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 711. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 711 Series and built by Hyundai Heavy Ind. at the Hyundai, Ulsan, Korea shipyard. The rig ...
  • Sedco 712 Rig owned by Transocean Inc.
    The Sedco 712 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 712. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 711 Series and built by Hyundai Heavy Ind. at the Hyundai Seoul Korea shipyard. The rig ...
  • Sedco 714 Rig owned by Transocean Inc.
    The Sedco 714 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco 714. The Semisub is a Semisub type of rig and is designed as a Earl & Wright/Sedco 711 Series and built by Hyundai Heavy Ind. at the Hyundai Seoul Koreal shipyard. The rig ...
  • Sedco Energy Rig owned by Transocean Inc.
    The Sedco Energy drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco Energy. The Semisub is a Semisub type of rig and is designed as a Sedco Forex Express 2000 and built by Dir des Constructions Navales at the Dcn Brest, France shipyard. The rig ...
  • Sedco Express Rig owned by Transocean Inc.
    The Sedco Express drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedco Express. The Semisub is a Semisub type of rig and is designed as a Sedco Forex SFXpress 2000 and built by DCN at the Brestfrance shipyard. The rig can be operated in water ...
  • Sedneth 701 Rig owned by Transocean Inc.
    The Sedneth 701 drilling rig is owned by Transocean Inc. which can be contacted for jobs and careers on the Sedneth 701. 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 ...
  • 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 ...