Rolling cutter with improved rolling efficiency
First Claim
Patent Images
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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Accused Products
Abstract
A cutting structure may include an outer support element; and an inner rotatable cutting element comprising a cutting surface at its upper end; wherein the inner rotatable cutting element comprises at least one line contact along a circumferential side surface thereof and/or at least one point contact at a bottom face thereof.
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Citations
24 Claims
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1. A cutting structure, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A downhole cutting tool, comprising:
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a cutting element support structure on a blade having at least one cutter pocket formed therein; at least one rotatable cutting element disposed within the at least one cutter pocket, where in the at least one rotatable cutting element comprises a cutting surface at its upper end, the cutting surface comprising an ultrahard material, the cutting surface being rotatable about the at least one rotatable cutting element axis; at least one pin disposed in a groove in the cutting element support structure adjacent a circumferential side surface of the at least one rotatable cutting element, the at least one pin extending parallel to the axis of the at least one rotatable cutting element; and at least one retaining element configured to retain the rotatable cutting element in the cutter pocket. - View Dependent Claims (21, 22)
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23. A downhole cutting tool, comprising:
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a cutting element support structure having at least one cutter pocket formed therein; at least one rotatable cutting element disposed within the at least one cutter pocket, where in the at least one rotatable cutting element comprises a cutting surface at its upper end; at least one ball disposed adjacent a planar bottom face of the at least one rotatable cutting element; at least one retaining element configured to retain the rotatable cutting element in the cutter pocket; and a sleeve at least partially surrounding the at least one rotatable cutting element, wherein the at least one ball is disposed between the sleeve and the at least one rotatable cutting element. - View Dependent Claims (24)
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Specification