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Method for using a multipurpose unit with multipurpose tower and a surface blow out preventer

  • US 7,021,402 B2
  • Filed: 12/14/2004
  • Issued: 04/04/2006
  • Est. Priority Date: 12/15/2003
  • Status: Active Grant
First Claim
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1. A method of drilling and completing an underwater well, wherein the method comprises the steps of:

  • a. installing conductor casing from a floating vessel into a seabed and wherein the floating vessel has a mooring system that can limit excursions to a point that there is no risk of damage to a casing riser;

    b. drilling a bore through the conductor casing to a defined depth in the seabed;

    c. installing surface casing through the conductor casing, wherein the surface casing comprises a first end and a second end,d. disposing on a first end of the surface casing, a wellhead and a mudline suspension system;

    e. connecting the wellhead to a connector which is then connected to a lower stress joint;

    f. connecting the lower stress joint to a lower end of a tubular riser;

    g. connecting the tubular riser to an upper stress joint;

    h. connecting the upper stress joint to a surface wellhead in fluid communication with a surface blow out preventer;

    i. connecting the surface blow out preventer and the surface wellhead to a tensioning system on the floating vessel; and

    j. using a telescoping joint comprising a first joint end and a second joint end, wherein the first joint end connects to the surface blow out perventer and the second joint end connects to the floating vessel.

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