EP0119620A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved tooth design using cylindrical diamond cutting elements
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1984-03-19
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Granted: —
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Expires: 2004-03-19
Abstract
Abstract The cutting performance of cylindrical polycrystalline synthetic diamond elements (12) is improved by segmenting such cylindrically shaped elements (12) along a plane or planes parallel to the longitudinal axis (16) of the cylindrically shaped elements (12). In the prefered embodiments half cylinder or quarter cylinder shaped segments are incorporated as the diamond cutting elements (12) within teeth (10) disposed on a rotating bit. The planar surface or surfaces (12) characterizing the cylindrical segments are oriented within the tooth (10) to provide the leading and cutting face of the diamond cutting element (12). Typically, such planar surfaces (22) are entirely exposed and disposed adjacent to and form one wall of an adjacent and preceding fluid channel (24) whereby cleaning and cooling efficiency is also improved.
Inventors
- 👤 Alexander K. Meskin
- 👤 Clifford R. Pay
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 09:43
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
66 words
In a rotating bit having a bit face, an improvement comprising: a plurality of teeth disposed on said bit wherein each said tooth includes a diamond cutting element having a longitudinal axis, said diamond cutting element being characterized in shape as a segment of a cylinder including at least one planar surface, said planar surface forming at least in part a leading surface of said tooth.
Claim 2
Dependent Claim
66 words
In a rotating bit having a bit face, an improvement comprising: a plurality of teeth disposed on said bit wherein each said tooth includes a diamond cutting element having a longitudinal axis, said diamond cutting element being characterized in shape as a segment of a cylinder including at least one planar surface, said planar surface forming at least in part a leading surface of said tooth.
Claim 3
Dependent Claim
18 words
The improvement of Claim 1 wherein said cylindrical shape of said diamond cutting element is a circular cylinder.
Claim 4
Dependent Claim
32 words
The improvement of Claim 1 wherein said segment of said cylindrical shape is a half cylinder shape, said planar surface being a planar surface lying along a diameter of said cylindrical shape.
Claim 5
Dependent Claim
21 words
The improvement of Claim 3 wherein said planar surface is oriented and exposed to form said leading surface of said tooth.
Claim 6
Dependent Claim
32 words
The improvement of Claim 1 wherein said segment of said cylindrical shape of said diamond cutting element is characterized by an apical edge defining a dihedral angle of less than 180 degrees.
Claim 7
Dependent Claim
32 words
The improvement of Claim 5 wherein said segment of cylindrically shaped diamond cutting element is a quarter segment of a full cylinder and wherein said apical edge lies along said longitudinal axis.
Claim 8
Dependent Claim
29 words
The improvement of Claim 6 wherein said diamond cutting element is disposed within each tooth so that each apical edge provides the leading portion of said diamond cutting element.
Claim 9
Dependent Claim
27 words
'The improvement of Claim 7 wherein the tangential direction of movement of said tooth lies approximately along the bisector of said dihedral angle defining said apical edge.
Claim 10
Dependent Claim
52 words
The improvement of Claim 1 wherein said tooth further includes a trailing support disposed behind said diamond cutting element is contiguous thereto and is substantially congruous with a trailing surface of said diamond cutting element, said trailing support tapering from said trailing surface of said diamond cutting element to said bit face.
Claim 11
Dependent Claim
28 words
The improvement of Claim 1 wherein said diamond cutting element forms one wall of an adjacent fluid channel defined into said bit face in front of said tooth.
Claim 12
Dependent Claim
160 words
The improvement of Claim 1 wherein said bit includes a gage and a sloping shoulder, said teeth being disposed on said shoulder near said gage and extending above said bit face by a first predetermined distance, said gage including cutting elements disposed above said bit face of said gage by a second predetermined distance and said bit further being characterized by a longitudinal axis of rotation, the radial distance from ssaid longitudinal axis of rotation of said cutting elements disposed and extending above said gage being approximately equal to the radial distance from said longitudinal axis of rotation of an uppermost one of said diamond cutting elements disposed on said shoulder, said uppermost diamond cutting element on said shoulder being positioned on said shoulder next to said gage at a location such that said radial distances from said longitudinal axis of rotation of said cutting elements on said gage and of said uppermost diamond cutting element are set approximately equal.
Claim 13
Dependent Claim
136 words
In a rotating bit having a bit face and a plurality of teeth disposed thereon, an improvement comprising a cylindrically shaped polycrystalline diamond element incorporated within each said tooth, said diamond cutting element characterized by a shape assumed in the form of a segment of a cylinder and further characterized by having one end of said cylindrical shape formed into a conical segment, said segment of said cylindrical shape of said diamond cutting element providing at least one planar surface, said planar surface of said diamond cutting element oriented within said tooth to provide at least in part a leading surface of said tooth as defined by the direction of movement of said tooth during normal cutting operation when said bit rotates, whereby said cylindrically shaped diamond cutting element provides improved cutting efficiency and bit lifetime.
Claim 14
Dependent Claim
136 words
In a rotating bit having a bit face and a plurality of teeth disposed thereon, an improvement comprising a cylindrically shaped polycrystalline diamond element incorporated within each said tooth, said diamond cutting element characterized by a shape assumed in the form of a segment of a cylinder and further characterized by having one end of said cylindrical shape formed into a conical segment, said segment of said cylindrical shape of said diamond cutting element providing at least one planar surface, said planar surface of said diamond cutting element oriented within said tooth to provide at least in part a leading surface of said tooth as defined by the direction of movement of said tooth during normal cutting operation when said bit rotates, whereby said cylindrically shaped diamond cutting element provides improved cutting efficiency and bit lifetime.
Claim 15
Dependent Claim
34 words
The improvement of Claim 12 wherein said segment of said cylindrically shaped diamond cutting element is a half cylindrical segment, thereby defining a planar leading surface lying along a diameter of said cylindrical shape.
Claim 16
Dependent Claim
42 words
The improvement of Claim 12 wheren said segment of said cylindrically shaped diamond cutting element is a quarter segment, thereby defining an apical edge and two leading surfaces forming a dihedral angle behind said edge, said dihedral angle being approximately 90 degrees.
Claim 17
Dependent Claim
46 words
The improvement of Claim 14 wherein said cylindrically shaped diamond cutting element is characterized by a longitudinal axis lying along said apical edge and wherein said diamond cutting element is oriented with respect to said bit face so that said longitudinal axis is approximately perpendicular thereto.
Claim 18
Dependent Claim
44 words
The improvement of Claim 15 wherein a channel is defined into said bit face immediately in front of said diamond cutting element and wherein said apical edge is disposed on and serves at least as part of an adjacent wall of said fluid channel.
Claim 19
Dependent Claim
35 words
The improvement of Claim 16, further including a trailing support integrally formed with said bit face and extending in a tapered fashion from said bit face to a trailing surface of said diamond cutting element.
Claim 20
Dependent Claim
44 words
The improvement of Claim 17 wherein an end of said diamond cutting element exposed above said bit face is formed in the shape of a segment of a cone, the slope of said cone shaped segment approximately matching the slope of said trailing support.
Claim 21
Dependent Claim
158 words
The improvement of Claim 12 wherein a plurality of rows of said teeth are disposed on said bit and wherein said rows are paired to form a first and second related row, the distance of spacing between teeth within said first and second row being substantially constant, said teeth of said second row being disposed behind said teeth of said first row as defined by tangential motion of said teeth during rotation of said bit during normal cutting operations, said teeth of said second row being readily disposed halfway between said teeth of said first row, whereby said teeth of said first and second rows cut a uniform annular swath as said bit rotates of a higher effective tooth density than achievable by tooth density within said first or second row alone, said teeth of said second row following behind said teeth of said first row in the gaps between and behind said teeth of said first row.
References Cited (Backward Citations)
No citation records indexed.
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