# US 9,605,487 B2 · Methods for forming instrumented cutting elements of an earth-boring drilling tool > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,605,487 B2 - Document ID: US9605487B2 - Status: Granted - Kind: B2 - Application number: 13/586,650 - Filed: 2012-08-15 - Published: 2014-02-20 - Granted: 2017-03-28 - Earliest claimed: 2012-08-15 - Assignees: Baker Hughes Incorporated; Element Six Limited - Applicants: Danny E. Scott; Timothy Peter Mollart; John Robert Brandon - Inventors: Danny E. Scott; Timothy Peter Mollart; John Robert Brandon - Web page: https://patentgrep.com/patent/US9605487B2 ## CPC - E21B 10/567: with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts - B23P 15/32: twist-drills - B24D 18/0009: {using moulds or presses} - B24D 99/005: {Segments of abrasive wheels} - E21B 47/013: Devices specially adapted for supporting measuring instruments on drill bits - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS - B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q) - B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11) ## Abstract A method of forming an instrumented cutting element comprises forming a free-standing sintered diamond table having at least one chamber in the free-standing sintered diamond table, providing a doped diamond material within the at least one chamber, and attaching a substrate to the free-standing sintered diamond table to form an instrumented cutting element. The instrumented cutting element includes the doped diamond material disposed within the sintered diamond table on the substrate. A method of forming an earth-boring tool comprises attaching at least one instrumented cutting element to a body of an earth-boring tool. The at least one instrumented cutting element has a diamond table bonded to a substrate. The diamond table has at least one sensing element disposed at least partially within the diamond table. The at least one sensing element comprises a doped diamond material. ## Claims ### Claim 1 A method of forming an instrumented cutting element, the method comprising: forming a free-standing sintered diamond table by performing a first high temperature, high pressure (HTHP) sintering process, the free-standing sintered diamond table having at least one chamber extending from a surface thereof only partially into the free-standing sintered diamond table; providing an electrically conductive doped diamond material within the at least one chamber after formation of the free-standing sintered diamond table and performing a second HTHP sintering process; and attaching a substrate to the free-standing sintered diamond table such that the electrically conductive doped diamond material in the at least one chamber is electrically coupled with a conductive material at an interface of the free-standing sintered diamond table and the substrate. ### Claim 2 (depends on 1) The method of claim 1, wherein forming the free-standing sintered diamond table by performing the first HTHP sintering process includes: forming the sintered diamond table on an initial substrate; and removing the initial substrate to form the free-standing sintered diamond table. ### Claim 3 (depends on 2) The method of claim 2, wherein removing the initial substrate comprises dissolving the initial substrate. ### Claim 4 (depends on 2) The method of claim 2, wherein forming the free-standing sintered diamond table comprises selecting an initial substrate to comprise at least one protrusion; forming the sintered diamond table at least partially around the at least one protrusion; and removing the at least one protrusion from within the diamond table to form the at least one chamber in the free-standing sintered diamond table. ### Claim 5 (depends on 1) The method of claim 1, further comprising removing a portion of the free-standing sintered diamond table to form the at least one chamber in the free-standing sintered diamond table. ### Claim 6 (depends on 5) The method of claim 5, wherein removing a portion of the free-standing sintered diamond table comprises at least one of grinding, electric discharge machining, laser cutting, spark eroding, and applying a hot metal solvent to the free-standing sintered diamond table. ### Claim 7 (depends on 1) The method of claim 1, further comprising: providing at least one metal insert within the free-standing diamond table; and dissolving the at least one metal insert to form the at least one chamber within the free-standing sintered diamond table. ### Claim 8 (depends on 1) The method of claim 1, wherein attaching the substrate to the sintered diamond table occurs while subjecting both the substrate and the free-standing sintered diamond table with the electrically conductive doped diamond material within the at least one chamber to the second HTHP process. ### Claim 9 (depends on 8) The method of claim 8, further comprising forming at least one conduit in the substrate of the instrumented cutting element, the at least one conduit coupled with the doped diamond material within the at least one chamber of the sintered diamond table. ### Claim 10 (depends on 9) The method of claim 9, wherein forming the at least one conduit further comprises forming the at least one conduit to extend through at least a portion of the sintered diamond table. ### Claim 11 (depends on 10) The method of claim 10, wherein forming the at least one conduit comprises forming the at least one conduit to extend across a to the doped diamond material within the at least one chamber located at a face of the sintered diamond table. ### Claim 12 (depends on 1) The method of claim 1, further comprising disposing a dielectric material within the at least one chamber within the diamond table such that the dielectric material is between the doped diamond material and the diamond table after the doped diamond material is provided within the at least one chamber. ### Claim 13 (depends on 1) The method of claim 1, further comprising removing a metal solvent catalyst material from within interstitial spaces between inter-bonded diamond grains of the diamond table. ### Claim 14 A method of forming an earth-boring tool, the method comprising: forming at least one instrumented cutting element by: performing a first high temperature, high pressure (HTHP) sintering process to form a free-standing sintered diamond table having at least one chamber at least substantially entirely enclosed by the free-standing sintered diamond table; providing a doped diamond material within the at least one chamber after formation of the free-standing sintered diamond table to form at least one sensing element; performing a second HTHP sintering process on the doped diamond material and the sintered diamond table; and attaching a substrate to the free-standing sintered diamond table with the doped diamond material within the at least one chamber to form the at least one instrumented cutting element such that the doped diamond material is at least substantially entirely embedded within the sintered diamond table on the substrate; and attaching at least one instrumented cutting element to a body of an earth-boring tool. ### Claim 15 (depends on 14) The method of claim 14, wherein forming the free-standing sintered diamond table comprises: selecting an initial substrate to comprise at least one protrusion; forming a sintered diamond table at least partially around the at least one protrusion; and removing the at least one protrusion from within the diamond table to form the at least one chamber in the free-standing sintered diamond table. ### Claim 16 (depends on 14) The method of claim 14, further comprising removing a portion of the free-standing sintered diamond table to form the at least one chamber in the free-standing sintered diamond table. ### Claim 17 (depends on 14) The method of claim 14, further comprising forming at least one conduit in the substrate of the instrumented cutting element, the at least one conduit coupled with the doped diamond material. ### Claim 18 (depends on 17) The method of claim 17, further comprising disposing a dielectric material and a conductive element in the at least one conduit, the dielectric material electrically isolating the conductive element from the substrate. ### Claim 19 (depends on 14) The method of claim 14, further comprising leaching at least a portion of the diamond table proximate the at least one sensing element. ### Claim 20 (depends on 14) The method of claim 14, wherein attaching the substrate to the free-standing sintered diamond table with the doped diamond material within the at least one chamber occurs while performing the second HTHP sintering process on the doped diamond material and the sintered diamond table.