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

  • US 7,234,542 B2
  • Filed: 02/09/2006
  • Issued: 06/26/2007
  • Est. Priority Date: 10/14/1994
  • Status: Expired due to Fees
First Claim
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1. A drilling apparatus to drill a borehole, comprising:

  • a tubular drill string attached to a rotary drill bit, the drill bit having at least one mud passage for passing drilling mud from within the drill string to the borehole,a source of drilling mud,a source of cement, andat least one latching float collar valve installed within the drill string above the drill bit that is used to cement the drill string and the drill bit into the earth.

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