# US 2019/0376345 A1 · Earth-boring tools and related methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376345 A1 - Document ID: US20190376345A1 - Status: Published application - Kind: A1 - Application number: 16/004,765 - Filed: 2018-06-11 - Published: 2019-12-12 - Earliest claimed: 2018-06-11 - Assignees: Baker Hughes, A Ge Company, LLC - Applicants: Baker Hughes, a GE company, LLC - Inventors: Steven Craig Russell; Stephen Duffy - Web page: https://patentgrep.com/patent/US20190376345A1 ## CPC - E21B 10/567: with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts - E21B 10/14: combined with non-rolling cutters other than of leading-portion type - E21B 10/55: with preformed cutting elements - E21B 7/064: {specially adapted drill bits therefor} - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract An earth-boring tool includes a body, at least one blade extending axially from the body, at least one cutting element mounted at a leading face of the at least one blade and at least one hybrid ovoid mounted at an axial end of the at least one blade and rotationally trailing the at least one cutting element. The at least one hybrid ovoid includes a cylindrical base portion, a domed upper portion extending from a top of the cylindrical base portion, and an at least substantially planar cutting surface formed in at least the domed upper portion and defining a cutting edge extending angularly through an angle of at least 180°, the at least substantially planar cutting surface is configured for a shear-type cutting action, oriented substantially in the direction of intended bit rotation, and exhibits a lesser aggressiveness than the aggressiveness of the at least one cutting element. ## Claims ### Claim 1 An earth-boring tool, comprising: a body having at least one blade extending axially from the body; at least one cutting element mounted at a leading face of the at least one blade; and at least one hybrid ovoid mounted at an axial end of the at least one blade and rotationally trailing the at least one cutting element, the at least one hybrid ovoid comprising: a cylindrical base portion; a domed upper portion extending from a top of the cylindrical base portion; and an at least substantially planar cutting surface formed in at least the domed upper portion and defining a cutting edge extending angularly through an angle of at least 180°, the at least substantially planar cutting surface configured for a shear-type cutting action, oriented substantially in the direction of intended bit rotation, and exhibiting a lesser aggressiveness than the aggressiveness of the at least one cutting element. ### Claim 2 (depends on 1) The earth-boring tool of claim 1, wherein an arcuate surface of domed upper portion has a radius of curvature within a range of about 0.24 inch and about 0.26 inch. ### Claim 3 (depends on 1) The earth-boring tool of claim 1, wherein cutting edge comprises an at least substantially circular cutting edge. ### Claim 4 (depends on 3) The earth-boring tool of claim 3, wherein the cutting surface has a diameter within a range of about 0.30 inch and about 0.40 inch. ### Claim 5 (depends on 1) The earth-boring tool of claim 1, wherein the cutting surface extends from an interface of the base portion and the domed upper portion to about an apex of the domed upper portion. ### Claim 6 (depends on 1) The earth-boring tool of claim 1, wherein a center longitudinal axis of the at least one hybrid ovoid is substantially parallel to a center longitudinal axis of the earth-boring tool. ### Claim 7 (depends on 1) The earth-boring tool of claim 1, wherein the at least one hybrid ovoid is disposed within a cone region of the at least one blade. ### Claim 8 (depends on 1) The earth-boring tool of claim 1, wherein the cutting surface of the at least one hybrid ovoid is oriented at an angle relative to a center longitudinal axis of the at least one hybrid ovoid within a range of about 30° and about 600. ### Claim 9 (depends on 1) The earth-boring tool of claim 1, wherein the cutting surface of the at least one hybrid ovoid has a back rake within a range of about 25° and about 60° and a side rake within a range of about −15° and about 15°. ### Claim 10 (depends on 1) The earth-boring tool of claim 1, wherein a height of exposure of the cutting element and a height of exposure of the at least one hybrid ovoid are substantially the same. ### Claim 11 A hybrid ovoid comprising: a cylindrical base portion; a domed upper portion extending from a top of the cylindrical base portion; and an at least substantially planar cutting surface formed in the domed upper portion and defining a cutting edge extending angularly through an angle of at least 180°, the at least substantially planar surface configured for a shear-type cutting action, oriented substantially in the direction of intend bit rotation, and exhibiting a lesser aggressiveness than the aggressiveness of the at least one cutting element. ### Claim 12 (depends on 11) The earth-boring tool of claim 11, wherein an arcuate surface of domed upper portion has a radius of curvature within a range of about 0.24 inch to about 0.26 inch. ### Claim 13 (depends on 11) The earth-boring tool of claim 11, wherein the base portion comprises a cemented carbide, and wherein the upper portion comprises a superabrasive material. ### Claim 14 (depends on 11) The earth-boring tool of claim 11, wherein the cutting surface has an at least substantially circular peripheral edge. ### Claim 15 (depends on 11) The earth-boring tool of claim 11, wherein the cutting surface extends from a region of the cylindrical base portion below an interface of the base portion and the upper portion and to about an apex of the upper portion of the hybrid ovoid. ### Claim 15 (canceled) ### Claim 16 (canceled) ### Claim 16 (canceled) ### Claim 17 A method of forming an earth-boring tool, the method comprising: forming a hybrid ovoid comprising: forming a domed upper portion on a cylindrical base portion of a hybrid ovoid; forming a cutting surface in at least the upper portion of the hybrid ovoid; forming the cutting surface to extend angularly through an angle of at least 180; and mounting the hybrid ovoid to an axial end of a blade of an earth-boring tool such a center longitudinal axis of the hybrid ovoid is substantially parallel to a center longitudinal axis of the earth-boring tool. ### Claim 18 (depends on 17) The earth-boring tool of claim 17, wherein forming the upper portion comprises pressing the upper portion within a mold. ### Claim 19 (depends on 17) The earth-boring tool of claim 17, wherein forming the cutting surface comprises defining the cutting surface with a laser. ### Claim 20 (depends on 17) The earth-boring tool of claim 17, wherein forming the cutting surface comprises forming an at least substantially circular cutting surface. ### Claim 21 (depends on 11) The earth-boring tool of claim 11, wherein the cutting surface extends from an interface of the base portion and the upper portion to an apex of the upper portion. ### Claim 22 (depends on 11) The earth-boring tool of claim 11, wherein a height of the domed upper portion is dependent on a diameter of the cutting surface.