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Rolling cutter with improved rolling efficiency

  • US 9,291,000 B2
  • Filed: 11/14/2012
  • Issued: 03/22/2016
  • Est. Priority Date: 11/14/2011
  • Status: Expired due to Fees
First Claim
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1. A cutting structure, comprising:

  • an outer support element located on a blade of a downhole tool; and

    an inner rotatable cutting element comprising a cutting surface at its upper end, the cutting surface comprising an ultrahard material, the cutting surface being rotatable about the inner rotatable cutting element axis;

    wherein the inner rotatable cutting element comprises at least one line contact along a circumferential side surface thereof or a combination of at least one line contact along a circumferential side surface thereof and at least one point contact at a bottom face thereof, wherein the at least one line contact is between the inner rotatable cutting element and at least one pin that extends axially, and wherein the at least one pin is disposed in a groove in the outer support element.

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