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Offshore universal riser system

  • US 9,376,870 B2
  • Filed: 09/19/2014
  • Issued: 06/28/2016
  • Est. Priority Date: 11/07/2006
  • Status: Active Grant
First Claim
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1. A riser system for use with a tubular string, comprising:

  • a riser string comprising opposite end connections;

    multiple seals longitudinally spaced apart along and within the riser string between the opposite end connections, each seal comprising an engagement surface configured to sealingly engage the tubular string when positioned in the riser string while the tubular string rotates; and

    wherein the tubular string is rotatable relative to the engagement surfaces of the seals.

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