Expandable reamer apparatus and related methods

  • US 8,215,418 B2
  • Filed: 08/19/2011
  • Issued: 07/10/2012
  • Est. Priority Date: 07/30/2002
  • Status: Active Grant
First Claim
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1. A method of operating an expandable reamer, the method comprising:

  • increasing a flow rate of drilling fluid through the expandable reamer to cause at least one blade of the expandable reamer to move from a retracted position to an expanded position while the expandable reamer is positioned downhole;

    decreasing the flow rate of drilling fluid through the expandable reamer to cause the at least one blade of the expandable reamer to move from the expanded position to the retracted position while the expandable reamer is positioned downhole; and

    increasing the flow rate of the drilling fluid through the expandable reamer and maintaining the at least one blade of the expandable reamer in the retracted position while the expandable reamer is positioned downhole.

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