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Drilling subsurface wellbores with cutting structures

  • US 7,841,425 B2
  • Filed: 04/18/2008
  • Issued: 11/30/2010
  • Est. Priority Date: 04/20/2007
  • Status: Expired due to Fees
First Claim
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1. A system for forming a wellbore in a heated formation, comprising:

  • a drill tubular;

    a drill bit coupled to the drill tubular; and

    one or more cutting structures coupled to the drill tubular above the drill bit, wherein the cutting structures are configured to remove at least a portion of the heated formation that extends into the wellbore formed by the drill bit;

    wherein the wellbore is configured to be formed by the drill bit in the heated formation, the heated formation having been heated by one or more heat sources located in the formation prior to the wellbore being formed.

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