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Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells

DC
  • US 7,048,050 B2
  • Filed: 10/02/2003
  • Issued: 05/23/2006
  • Est. Priority Date: 10/14/1994
  • Status: Expired due to Fees
First Claim
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1. An apparatus for drilling a wellbore comprising:

  • a drill string having a casing portion for lining the wellbore;

    a drilling assembly operatively connected to the drill string and having an earth removal member, a portion of the drilling assembly being selectively removable from the wellbore without removing the casing portion; and

    a one-way cement valve disposed within the casing portion.

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