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DRILLING RISER

  • US 3,601,187 A
  • Filed: 05/02/1969
  • Issued: 08/24/1971
  • Est. Priority Date: 05/02/1969
  • Status: Expired due to Term
First Claim
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1. Apparatus for use in an offshore well operation comprising:

  • a. a substantially vertical riser;

    b. an extensible joint attached to the upper end of the riser;

    c. a flexible joint in said riser positioned below and in close proximity to the extensible joint;

    d. means for flexibly connecting the lower end of the riser to a subsea wellhead;

    e. means for pivotally connecting the extensible joint to a floating vessel; and

    f. means for applying tension to the riser.

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