# US 2014/0196959 A1 · Downhole drill bit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196959 A1 - Document ID: US20140196959A1 - Status: Published application - Kind: A1 - Application number: 14/089,385 - Filed: 2013-11-25 - Published: 2014-07-17 - Earliest claimed: 2006-08-11 - Assignees: Schlumberger Technology Corporation - Applicants: Schlumberger Technology Corporation - Inventors: David R. Hall; John D. Bailey; Ronald B. Crockett - Web page: https://patentgrep.com/patent/US20140196959A1 ## CPC - E21B 10/55: with preformed cutting elements - E21B 10/43: characterised by the arrangement of teeth or other cutting elements - E21B 10/5735: {Interface between the substrate and the cutting element} - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A downhole cutting tool may include a tool body; a plurality of blades extending from the tool body; a first blade comprising at least one pointed cutting element thereon, the at least one pointed cutting element comprising a first polycrystalline diamond material on a first carbide substrate, the first polycrystalline diamond material extending away from the first carbide substrate to terminate in a substantially pointed geometry opposite the first carbide substrate; a second blade comprising at least one shear cutting element, the at least one shear cutting element comprising a second polycrystalline diamond material on a second carbide substrate, the second polycrystalline diamond material forming a planar cutting surface opposite the substrate; wherein, when the first blade and the second blade are superimposed on each other, a central axis of the at least one pointed cutting element is offset from a central axis of the at least one shear cutting element. ## Claims ### Claim 1 A downhole cutting tool, comprising: a tool body; a plurality of blades extending from the tool body; a first blade comprising at least one pointed cutting element thereon, the at least one pointed cutting element comprising a first polycrystalline diamond material on a first carbide substrate, the first polycrystalline diamond material extending away from the first carbide substrate to terminate in a substantially pointed geometry opposite the first carbide substrate; a second blade comprising at least one shear cutting element, the at least one shear cutting element comprising a second polycrystalline diamond material on a second carbide substrate, the second polycrystalline diamond material forming a planar cutting surface opposite the substrate; wherein, when the first blade and the second blade are superimposed on each other, a central axis of the at least one pointed cutting element is offset from a central axis of the at least one shear cutting element. ### Claim 2 (depends on 1) The downhole cutting tool of claim 1, wherein the first polycrystalline diamond material has a thickness measured from an outer surface of the pointed cutting element to an interface with first carbide substrate, the thickness being greatest at an apex of the pointed cutting element. ### Claim 3 (depends on 1) The downhole cutting element of claim 1, wherein the first blade is positioned adjacent to the second blade. ### Claim 4 (depends on 1) The downhole cutting element of claim 1, wherein the central axis of the at least one pointed cutting element is radially offset from a central axis of the at least one shear cutting element. ### Claim 5 (depends on 1) The downhole cutting element of claim 1, wherein the central axis of the at least one pointed cutting element is angled relative to the central axis of the at least one shear cutting element. ### Claim 6 (depends on 1) The downhole cutting tool of claim 1, wherein the substantially pointed geometry comprises a side wall that tangentially joins an apex having a radius of curvature. ### Claim 7 (depends on 1) The downhole cutting tool of claim 1, wherein the pointed cutting element and the shear cutting element comprise different rake angles. ### Claim 8 (depends on 1) The downhole cutting tool of claim 1, wherein the downhole cutting tool is a fixed cutter drill bit having the plurality of blades extending from a bit body. ### Claim 9 A downhole cutting tool, comprising: a tool body; a plurality of blades extending from the tool body; and a plurality of cutting elements on the plurality of blades, the plurality of cutting elements including at least one pointed cutting element and at least one shear cutting element, the at least one pointed cutting element thereon, the at least one pointed cutting element comprising a first polycrystalline diamond material on a first carbide substrate, the first polycrystalline diamond material extending away from the first carbide substrate to terminate in a substantially pointed geometry opposite the first carbide substrate; the at least one shear cutting element, the at least one shear cutting element comprising a second polycrystalline diamond material on a second carbide substrate, the second polycrystalline diamond material forming a planar cutting surface opposite the substrate; wherein, when the plurality of blades are superimposed on each other, a central axis of at least one pointed cutting element is radially between from a central axis of least two shear cutting elements. ### Claim 10 (depends on 9) The downhole cutting tool of claim 9, wherein the first polycrystalline diamond material has a thickness measured from an outer surface of the pointed cutting element to an interface with first carbide substrate, the thickness being greatest at an apex of the pointed cutting element. ### Claim 11 (depends on 9) The downhole cutting element of claim 9, wherein the central axis of the at least one pointed cutting element is angled relative to the central axis of the at least one shear cutting element. ### Claim 12 (depends on 9) The downhole cutting tool of claim 9, wherein the substantially pointed geometry comprises a side wall that tangentially joins an apex having a radius of curvature. ### Claim 13 (depends on 9) The downhole cutting tool of claim 9, wherein the pointed cutting element and the shear cutting element comprise different rake angles. ### Claim 14 (depends on 9) The downhole cutting tool of claim 9, wherein the downhole cutting tool is a fixed cutter drill bit having the plurality of blades extending from a bit body. ### Claim 15 A downhole cutting tool, comprising: a tool body; a plurality of blades extending from the tool body; and a plurality of cutting elements on the plurality of blades, the plurality of cutting elements including at least one pointed cutting element and at least one shear cutting element, the at least one pointed cutting element thereon, the at least one pointed cutting element comprising a first polycrystalline diamond material on a first carbide substrate, the first polycrystalline diamond material extending away from the first carbide substrate to terminate in a substantially pointed geometry opposite the first carbide substrate; the at least one shear cutting element, the at least one shear cutting element comprising a second polycrystalline diamond material on a second carbide substrate, the second polycrystalline diamond material forming a planar cutting surface opposite the substrate; wherein, when the plurality of blades are superimposed on each other, a central axis of at least one pointed cutting element is radially between from a central axis of least two shear cutting elements. ### Claim 16 (depends on 15) The downhole cutting tool of claim 15, wherein the first polycrystalline diamond material has a thickness measured from an outer surface of the pointed cutting element to an interface with first carbide substrate, the thickness being greatest at an apex of the pointed cutting element. ### Claim 17 (depends on 15) The downhole cutting element of claim 15, wherein the central axis of the at least one pointed cutting element is angled relative to the central axis of the at least one shear cutting element. ### Claim 18 (depends on 15) The downhole cutting tool of claim 15, wherein the substantially pointed geometry comprises a side wall that tangentially joins an apex having a radius of curvature. ### Claim 19 (depends on 15) The downhole cutting tool of claim 15, wherein the pointed cutting element and the shear cutting element comprise different rake angles. ### Claim 20 (depends on 15) The downhole cutting tool of claim 15, wherein the downhole cutting tool is a fixed cutter drill bit having the plurality of blades extending from a bit body. ### Claim 21 A downhole cutting tool, comprising: a tool body; a plurality of blades extending from the tool body; a first blade comprising at least one pointed cutting element thereon, the at least one pointed cutting element comprising a first polycrystalline diamond material on a first carbide substrate, the first polycrystalline diamond material extending away from the first carbide substrate to terminate in a substantially pointed geometry opposite the first carbide substrate; a second blade comprising at least one shear cutting element, the at least one shear cutting element comprising a second polycrystalline diamond material on a second carbide substrate, the second polycrystalline diamond material forming a planar cutting surface opposite the substrate; wherein a central axis of a first pointed cutting element is oriented at a different angle from a central axis of a second pointed cutting element. ### Claim 22 (depends on 21) The downhole cutting tool, of claim 21, wherein the first pointed cutting element and the second pointed cutting element are on the same blade. ### Claim 23 (depends on 21) The downhole cutting tool of claim 21, wherein the central axis of the first pointed cutting element is tangent to its intended cutting path, and the central axis of the second pointed cutting element is angled relative to its intended cutting path. ### Claim 24 (depends on 21) The downhole cutting tool of claim 21, wherein the first polycrystalline diamond material has a thickness measured from an outer surface of the pointed cutting element to an interface with first carbide substrate, the thickness being greatest at an apex of the pointed cutting element. ### Claim 25 (depends on 21) The downhole cutting tool of claim 21, wherein the substantially pointed geometry comprises a side wall that tangentially joins an apex having a radius of curvature. ### Claim 26 (depends on 21) The downhole cutting tool of claim 21, wherein the pointed cutting element and the shear cutting element comprise different rake angles. ### Claim 27 (depends on 21) The downhole cutting tool of claim 21, wherein the downhole cutting tool is a fixed cutter drill bit having the plurality of blades extending from a bit body.