# US 12,761,391 B2 · EM logging tool employing wire tube interference mitigation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,761,391 B2 - Document ID: US12761391B2 - Status: Granted - Kind: B2 - Application number: 18/819,094 - Filed: 2024-08-29 - Published: 2026-03-05 - Granted: 2026-10-13 - Earliest claimed: 2024-08-29 - Assignees: Schlumberger Technology Corporation - Applicants: Schlumberger Technology Corporation - Inventors: Michael Du; Anatoly Dementyev; Mark Frey; Rachel Belleville; Daniel Fernandez - Web page: https://patentgrep.com/patent/US12761391B2 ## CPC - G01V 3/28: using induction coils - E21B 47/12: Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling - E21B 47/138: {Devices entrained in the flow of well-bore fluid for transmitting data, control or actuation signals} - G01V 3/34: Transmitting data to recording or processing apparatus; Recording data - G01V 3/30: operating with electromagnetic waves - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract An electromagnetic logging tool includes at least one electromagnetic receiving antenna deployed on a logging while drilling tool body. The receiving antenna is configured to receive a complex voltage signal and thereby make electromagnetic logging measurements. An electrically conductive tube is deployed in the tool body and within an inner diameter of the receiving antenna such that a longitudinal axis of the tube is coincident with a longitudinal axis of the tool body. An insulated electrical conductor is deployed in the tube and is configured to transmit electronic data and/or electrical power from one axial end of the tool body to an opposing axial end of the tool body. ## Claims ### Claim 1 An electromagnetic logging tool comprising: a tool body having a body longitudinal axis, a flow channel extending through the tool body, and an outer surface; at least one electromagnetic receiving antenna deployed on the outer surface of the tool body, the at least one electromagnetic receiving antenna configured to receive a complex voltage signal and thereby make electromagnetic logging measurements; an electrically conductive tube deployed in the flow channel of the tool body and within an inner diameter of the at least one electromagnetic receiving antenna, a tube longitudinal axis of the electrically conductive tube coincident with the body longitudinal axis of the tool body, wherein the electrically conductive tube includes a tube bore extending through the electrically conductive tube; and an insulated electrical conductor deployed in the tube bore of the electrically conductive tube and within the inner diameter of the at least one electromagnetic receiving antenna, the insulated electrical conductor configured to transmit at least one of electronic data or electrical power from a first axial end of the tool body to a second axial end of the tool body, wherein the insulated electrical conductor is substantially coincident with the electrically conductive tube and the body longitudinal axis of the tool body. ### Claim 2 (depends on 1) The logging tool of claim 1, wherein the at least one electromagnetic receiving antenna comprises first and second collocated transverse receiving antennas or first and second rotationally offset tilted antennas. ### Claim 3 (depends on 1) The logging tool of claim 1, wherein the electromagnetic logging tool is a receiver sub and the at least one electromagnetic receiving antenna is configured to make deep reading electromagnetic logging measurements via electromagnetically coupling with a transmitting antenna deployed on a transmitter sub that is distinct from the receiver sub. ### Claim 4 (depends on 1) The logging tool of claim 1, wherein the first axial end of the tool body is coupled with a flow diverter that is configured to divert drilling fluid flow from a central flow channel to an annular flow channel and the second axial end of the tool body is coupled with a centralizer that is deployed in the tool body. ### Claim 5 (depends on 1) The logging tool of claim 1, wherein the electrically conductive tube is integrally formed with a flow diverter that is configured to divert drilling fluid flow from a central flow channel to an annular flow channel. ### Claim 6 (depends on 1) The logging tool of claim 1, wherein the electrically conductive tube comprises an inner tube and an outer tube, wherein the inner tube and the outer tube are electrically conductive and nonmagnetic. ### Claim 7 (depends on 6) The logging tool of claim 6, wherein the inner tube has an inner tube electrical conductivity that is at least 10 times greater than a body electrical conductivity of the tool body. ### Claim 8 (depends on 6) The logging tool of claim 6, wherein the outer tube is integrally formed with a flow diverter that is configured to divert drilling fluid flow from the flow channel to an annular flow channel between the tool body and the electrically conductive tube. ### Claim 9 (depends on 6) The logging tool of claim 6, further comprising a plurality of electrical contact rings that provide electrical contact between the inner tube, the outer tube, and the tool body. ### Claim 10 (depends on 1) The logging tool of claim 1, wherein an electromagnetic coupling between the insulated electrical conductor and the at least one electromagnetic receiving antenna is less than 100 micro volts per amp of alternating electrical current in the insulated electrical conductor at frequencies 500 Hz and above. ### Claim 11 (depends on 1) The logging tool of claim 1, further comprising: a power source; and a processor utilizing power and configured to receive and transmit electronic communications, wherein the insulated electrical conductor extends from the power source, to the electrically conductive tube at the first axial end, through the tube bore to the second axial end, and to the processor, and wherein the insulated electrical conductor provides the power to the processor from the power source. ### Claim 12 (depends on 11) The logging tool of claim 11, wherein the processor and the power source are in electrical communication with the electrically conductive tube, and a return current is provided at the electrically conductive tube. ### Claim 13 A deep reading electromagnetic logging tool comprising: a transmitter sub configured for deployment in a drill string, the transmitter sub including at least one electromagnetic transmitting antenna deployed on a transmitter sub body, the at least one electromagnetic transmitting antenna configured to transmit electromagnetic energy into a surrounding environment; a receiver sub configured for deployment in the drill string, the receiver sub including a receiver sub body and at least one electromagnetic receiving antenna deployed on an outer surface of the receiver sub body, the at least one electromagnetic receiving antenna configured to receive a complex voltage signal induced by the electromagnetic energy and thereby make electromagnetic logging measurements; an electrically conductive tube deployed in a flow channel in the receiver sub body and within an inner diameter of the at least one electromagnetic receiving antenna, a tube longitudinal axis of the electrically conductive tube coincident with a body longitudinal axis of the receiver sub body, wherein the electrically conductive tube includes a tube bore extending through the electrically conductive tube; and an insulated electrical conductor deployed in the tube bore of the electrically conductive tube and within the inner diameter of the at least one electromagnetic receiving antenna, the insulated electrical conductor configured to transmit at least one of electronic data or electrical power from a first axial end of the receiver sub body to a second axial end of the receiver sub body, wherein the insulated electrical conductor is substantially coincident with the electrically conductive tube and the body longitudinal axis of the receiver sub body. ### Claim 14 (depends on 13) The logging tool of claim 13, wherein: the at least one electromagnetic transmitting antenna comprises a triaxial set of transmitting antennas; and the at least one electromagnetic receiving antenna comprises a triaxial set of receiving antennas. ### Claim 15 (depends on 13) The logging tool of claim 13, wherein the electrically conductive tube comprises an inner tube and an outer tube, wherein the inner tube and the outer tube are electrically conductive and nonmagnetic. ### Claim 16 (depends on 15) The logging tool of claim 15, wherein the inner tube has an inner tube electrical conductivity that is at least 10 times greater than a body electrical conductivity of the receiver sub body. ### Claim 17 (depends on 15) The logging tool of claim 15, wherein an electromagnetic coupling between the insulated electrical conductor and the at least one electromagnetic receiving antenna is less than 100 micro volts per amp of alternating electrical current in the insulated electrical conductor at frequencies 500 Hz and above. ### Claim 18 An electromagnetic logging tool comprising: a tool body; a power source in the tool body; a processor in the tool body; at least one electromagnetic receiving antenna deployed on the tool body, the at least one electromagnetic receiving antenna configured to receive a complex voltage signal and thereby make electromagnetic logging measurements; an inner tube and an outer tube deployed in the tool body and within an inner diameter of the at least one electromagnetic receiving antenna, an inner tube longitudinal axis of the inner tube coincident with a body longitudinal axis of the tool body, wherein the inner tube and the outer tube are electrically conductive and nonmagnetic; and an insulated electrical conductor deployed in the inner tube and within the inner diameter of the at least one electromagnetic receiving antenna, the insulated electrical conductor configured to transmit at least one of electronic data or electrical power from a first axial end of the tool body to a second axial end of the tool body, wherein the insulated electrical conductor is substantially coincident with the inner tube, the outer tube, and the body longitudinal axis of the tool body, and wherein the insulated electrical conductor extends from the power source, to the inner tube at the first axial end, through the inner tube to the second axial end, and to the processor, and wherein the insulated electrical conductor provides power to the processor from the power source. ### Claim 19 (depends on 18) The logging tool of claim 18, wherein the inner tube has an inner tube electrical conductivity that is at least 10 times greater than a body electrical conductivity of the tool body. ### Claim 20 (depends on 18) The logging tool of claim 18, wherein an electromagnetic coupling between the insulated electrical conductor and the at least one electromagnetic receiving antenna is less than 100 micro volts per amp of alternating electrical current in the insulated electrical conductor at frequencies 500 Hz and above.