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Method of drilling a bore hole

  • US 7,284,623 B2
  • Filed: 07/10/2002
  • Issued: 10/23/2007
  • Est. Priority Date: 08/01/2001
  • Status: Active Grant
First Claim
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1. A method for drilling a borehole through a production zone underlying an overburden of various earth formations, the method comprising:

  • drilling the borehole through the overburden with at least one drill bit selected to optimize at least one drilling performance parameter; and

    drilling the borehole through at least part of the production zone with at least one other drill bit selected to optimize at least one production performance parameter.

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