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Apparatus and method of drilling with casing

  • US 6,899,186 B2
  • Filed: 12/13/2002
  • Issued: 05/31/2005
  • Est. Priority Date: 12/13/2002
  • Status: Expired due to Term
First Claim
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1. A method of drilling a subsea wellbore with casing, comprising:

  • placing a string of casing with a drill bit at the lower end thereof in a riser system;

    urging the string of casing axially downward; and

    reducing the axial length of the string of casing through telescopic movement between a larger diameter portion and a smaller diameter portion of the string of casing to land a wellbore component in a subsea wellhead.

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