# US 9,752,385 B2 · Pipe in pipe BHA electric drive motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,385 B2 - Document ID: US9752385B2 - Status: Granted - Kind: B2 - Application number: 14/371,061 - Filed: 2012-01-11 - Published: 2014-11-06 - Granted: 2017-09-05 - Earliest claimed: 2012-01-11 - Assignees: Halliburton Energy Services, Inc. - Applicants: Richard Thomas Hay; Keith E. Holtzman - Inventors: Richard Thomas Hay; Keith E. Holtzman - Web page: https://patentgrep.com/patent/US9752385B2 ## CPC - E21B 4/04: Electric drives (E21B4/12 takes precedence) - E21B 17/003: {with electrically conducting or insulating means (E21B17/028 and E21B17/023 take precedence)} - E21B 17/0285: {characterised by electrically insulating elements} - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A pipe in pipe electric motor assembly comprising: a drilling string comprising an inner pipe and an outer pipe and an electric motor; wherein the electric motor is provided with power supplied by the inner pipe and the outer pipe acting at least as conductors and associated methods. ## Claims ### Claim 1 A pipe in pipe electric motor assembly comprising: a drilling string comprising an inner pipe and an outer pipe, wherein the inner pipe and the outer pipe transmit a direct current power along the drilling string; an electric motor controller electrically coupled to the inner pipe and the outer pipe, wherein the electric motor controller is positioned downhole, wherein the electric motor controller converts the direct current power to an alternating current; an electric motor coupled to the electric motor controller, wherein the electric motor is provided with the alternating current of the at least one phase by the electric motor controller; and wherein the electric motor controller alters any two phases of the alternating current to change the direction of rotation of a rotor of the electric motor. ### Claim 2 (depends on 1) The pipe in pipe electric motor assembly of claim 1, wherein at least one of the inner pipe or the outer pipe is coated with an insulating material. ### Claim 3 (depends on 2) The pipe in pipe electric motor assembly of claim 2, wherein the insulating material comprises a dielectric material. ### Claim 4 (depends on 3) The pipe in pipe electric motor assembly of claim 3, wherein the dielectric material comprises at least one material selected from the group consisting of a polyimide, a high strength toughened fluoropolymer, nylon, teflon, and a ceramic coating. ### Claim 5 (depends on 1) The pipe in pipe electric motor assembly of claim 1, further comprising a drive shaft. ### Claim 6 (depends on 5) The pipe in pipe electric motor assembly of claim 5, wherein the drive shaft comprises a drive shaft magnet. ### Claim 7 (depends on 1) The pipe in pipe electric motor assembly of claim 1, wherein the electric motor is coupled to a drill bit. ### Claim 8 A method of providing power to an electric motor comprising: providing a pipe in pipe electric motor assembly comprising: a drilling string comprising an inner pipe and an outer pipe, wherein the inner pipe and the outer pipe transmit a direct current power along the drilling string; an electric motor controller electrically coupled to the inner pipe and the outer pipe, wherein the electric motor controller is positioned downhole, wherein the electric motor controller converts the direct current power to an alternating current, and an electric motor coupled to the electric motor controller; and providing the alternating current of the at least one phase to the electric motor by the electric motor controller, wherein the electric motor controller alters any two phases of the alternating current to change the direction of rotation of a rotor of the electric motor. ### Claim 9 (depends on 8) The method of claim 8, wherein at least one of the inner pipe or the outer pipe is coated with an insulating material. ### Claim 10 (depends on 9) The method of claim 9, wherein the insulating material comprises a dielectric material. ### Claim 11 (depends on 10) The method of claim 10, wherein the dielectric material comprises at least one material selected from the group consisting of a polyimide, a high strength toughened fluoropolymer, nylon, teflon, and a ceramic coating. ### Claim 12 (depends on 8) The method of claim 8, wherein the pipe in pipe electric motor assembly further comprises a drive shaft. ### Claim 13 (depends on 12) The method of claim 12, wherein the drive shaft comprises a drive shaft magnet. ### Claim 14 (depends on 8) The method of claim 8, wherein the electric motor is coupled to a drill bit. ### Claim 15 A method of drilling a wellbore in a subterranean formation comprising: providing a pipe in pipe electric motor assembly comprising: a drilling string comprising an inner pipe and an outer pipe, wherein the inner pipe and the outer pipe transmit a direct current power along the drilling string; an electric motor controller electrically coupled to the inner pipe and the outer pipe, wherein the electric motor controller is positioned downhole, wherein the electric motor controller converts the direct current power to an alternating current; an electric motor coupled to the electric motor controller; and a drill bit, wherein the electric motor is provided with the alternating current by the electric motor controller; providing the alternating current of the at least one phase to the electric motor to generate rotational power, wherein the electric motor controller alters any two phases of the alternating current to change the direction of rotation of a rotor of the electric motor; and applying the rotational power to the drill bit. ### Claim 16 (depends on 15) The method of claim 15, wherein at least one of the inner pipe or the outer pipe is coated with an insulating material. ### Claim 17 (depends on 16) The method of claim 16, wherein the insulating material comprises a dielectric material. ### Claim 18 (depends on 17) The method of claim 17, wherein the dielectric material comprises at least one material selected from the group consisting of a polyimide, a high strength toughened fluoropolymer, nylon, teflon, and a ceramic coating. ### Claim 19 (depends on 15) The method of claim 15, wherein the pipe in pipe electric motor assembly further comprises a drive shaft. ### Claim 20 (depends on 19) The method of claim 19, wherein the drive shaft comprises a drive shaft magnet.