A proposal for placing a complete offshore oil field production system underwater is being developed by Sir Robert McAlpine and Sons. Known as Subseamac One, the towers of a traditional gravity platform are eliminated by placing deck equipment inside a series of massive, dry, one-atmosphere, concrete modules set directly on top of the base caisson. The principal structures in the system are:--(1) Cellular base caisson for seabed oil storage (500,000 barrels). (2) Four Cylindrical-shell containment vessels--for separation, water injection gas treatment, and habitats mounted on top of the base. (3) Surface support buoy 2,000 m away (with 300,000 barrels storage capacity). (4) Articulated flare tower with capacity to dispose of full gas production--needed to keep primary production going if gas re-injection has to be shut down. (5) Risers and flowlines are all flexible, with no diver requirement. Connections are either autolock type or one-atmosphere chamber. (6) Seabed dry wellhead module. Habitat and water-injection modules provide dry, one-atmosphere breathable conditions. Other modules normally have inert atmospheres. Dispositions of the various structures are shown in an annotated diagram. Order from: BSRA as No. 47,052.

  • Corporate Authors:

    Institution of Civil Engineers

    One Great George Street, Westminster
    London,   United Kingdom  SW1P 3AA
  • Publication Date: 1977-7

Media Info

  • Pagination: 3 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00170177
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: No. 7
  • Files: TRIS
  • Created Date: Mar 7 1978 12:00AM