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Self-supported drilling riser

  • US 3,999,617 A
  • Filed: 09/29/1975
  • Issued: 12/28/1976
  • Est. Priority Date: 09/29/1975
  • Status: Expired due to Term
First Claim
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1. A riser pipe assembly for use in drilling a well into a submerged bottom from a floating vessel, comprising:

  • a riser pipe extending between said vessel and said well, said riser pipe having an upper section and a lower section;

    connector means for releasably connecting the lower section of said riser to the upper section of said riser;

    buoyancy means attached to the lower section of said riser having sufficient buoyancy to make the lower section of said riser positively buoyant;

    cable means extending between said submerged bottom and the upper end of said lower section of said riser pipe;

    means for fastening said cable means to said riser pipe near the upper end of the lower section thereof to restrain vertical movement of said riser pipe relative to said cable means;

    lateral restraint means attached to the lower section of said riser pipe at spaced intervals along the length thereof and coupling said riser pipe to said cable means to restrain lateral movement of said riser pipe relative to said cable means.

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