Circumferential and longitudinal cutter coverage in continuation of a first bit diameter to a second expandable reamer diameter

  • US 9,593,538 B2
  • Filed: 06/04/2014
  • Issued: 03/14/2017
  • Est. Priority Date: 06/27/2008
  • Status: Expired due to Fees
First Claim
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1. A bottom hole assembly for use in a wellbore comprising a fixed diameter bit wherein a plurality of cutters extend from a central location to the outer ends of the bit to form a first diameter;

  • and an expandable reamer wherein a further plurality of cutters are placed on an extendable cutter block in at least two substantially parallel substantially helical rows, each substantially helical row having at least tour cutters, wherein at least three of the cutters on one of the substantially helical rows align with three of the cutters on the other of the substantially helical rows along the longitudinal axis to form at least three longitudinal rows of cutters extending along the longitudinal axis of the expandable reamer.

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