# US 11,905,763 B2 · Downhole transmission system with perforated MCEI segments > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,905,763 B2 - Document ID: US11905763B2 - Status: Granted - Kind: B2 - Application number: 17/665,533 - Filed: 2022-02-05 - Published: 2022-06-02 - Granted: 2024-02-20 - Earliest claimed: 2022-02-05 - Applicants: Joe Fox - Inventors: Joe Fox - Web page: https://patentgrep.com/patent/US11905763B2 ## CPC - E21B 17/0285: {characterised by electrically insulating elements} - E21B 17/003: {with electrically conducting or insulating means (E21B17/028 and E21B17/023 take precedence)} - E21B 47/13: by electromagnetic energy, e.g. radio frequency - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A system for transmitting data and power downhole includes an annular groove in a downhole tool such as a drill pipe shoulder or other tool body. A housing for an inductive coupler being disposed within the annular groove. The housing may be a metal ring or a polymeric ring suitable for downhole conditions. An annular MCEI trough may be located within the housing. The MCEI trough may comprise segments. One of the segments may comprise one or more perforations. An electrically conductive coil may be placed in the MCEI trough. The coil may comprise a transmission end and a groundable end. The groundable end may be connected to the tool body by a ground post through the perforations in the MCEI segments and the housing. The transmission end may be connected to a cable within the downhole tool through the other perforation in the MCEI trough and housing. ## Claims ### Claim 1 A transmission system, comprising: a downhole tool comprising an annular groove communicating with a drilled passageway in the downhole tool; an annular housing disposed within the annular groove, the annular housing comprising at least first and second perforations; an annular magnetically conductive electrically insulating, MCEI, trough disposed within the annular housing, the annular MCEI trough comprising first and second perforations; an annular electrically conductive coil laid within the annular MCEI trough; the annular electrically conductive coil comprising a groundable end and a transmission end; the groundable end being connected to a ground post electrically contacting the downhole tool through the first perforation in the annular housing and the first perforation in the MCEI trough, and wherein the transmission end is connected through the second perforation in the annular housing and the second perforation in the MCEI trough to a cable within the drilled passageway in the downhole tool. ### Claim 2 (depends on 1) The transmission system of claim 1, wherein the MCEI trough comprises MCEI segments, at least one of which comprises the first perforation. ### Claim 3 (depends on 1) The transmission system of claim 1, wherein the MCEI trough comprises MCEI segments, at least one of which comprises the second perforation. ### Claim 4 (depends on 1) The transmission system of claim 1, wherein the MCEI trough comprises MCEI segments, at least one of which comprises the first and the second perforations. ### Claim 5 (depends on 1) The transmission system of claim 1, wherein the cable is connected to another transmission end of another annular coil through a similarly configured annular MCEI trough at the opposite end of the downhole tool. ### Claim 6 (depends on 1) The transmission system of claim 1, wherein the cable is connected to another transmission end of another annular coil through a similarly configured annular MCEI trough within the downhole tool. ### Claim 7 (depends on 1) The transmission system of claim 1, wherein the cable is connected to equipment within or attached to the downhole tool. ### Claim 8 (depends on 1) The transmission system of claim 1, wherein the transmission end and the cable are connected by means of a compression connector. ### Claim 9 (depends on 1) The transmission system of claim 1, wherein the groundable end and the ground post are connected by means of compression connector. ### Claim 10 (depends on 1) The transmission system of claim 1, wherein an at least partially axially tapered clamp secures the cable within the downhole tool. ### Claim 11 (depends on 10) The transmission system of claim 10, wherein the tapered clamp comprises a nonlinear slit. ### Claim 12 (depends on 10) The transmission system of claim 10, wherein the tapered clamp holds the cable in sufficient tension to resist elongation of the cable under downhole conditions. ### Claim 13 (depends on 1) The transmission system of claim 1, wherein a reinforced gasket comprising internal resilient reinforcements seals the cable within the downhole tool. ### Claim 14 (depends on 13) The transmission system of claim 13, wherein the reinforced gasket is secured in place by a helical snap ring within the downhole tool. ### Claim 15 (depends on 13) The transmission system of claim 13, wherein the reinforced gasket provides a pressure and fluid seal between the interior of the gasket and the exterior of the cable and between the exterior of the gasket and the interior of the passageway in the downhole tool. ### Claim 16 (depends on 1) The transmission system of claim 1, wherein the housing comprises a downhole-suitable polymeric block comprising up to 67% by volume of micron and submicron particles of Fe and Mn ranging in average diameters of between 150μ and 3000μ in an average ratio of between 8:2 and 2:8 Fe to Mn. ### Claim 17 (depends on 1) The transmission system of claim 1, wherein the groove comprises a surface hardness on the Rockwell C scale greater than the surface hardness of the downhole tool proximate the groove. ### Claim 18 (depends on 1) The transmission system of claim 1, wherein the cable comprises a coaxial cable comprising an armored exterior. ### Claim 19 (depends on 1) The transmission system of claim 1, wherein the cable comprises a coaxial cable comprising an armored exterior comprising a magnetic or a nonmagnetic stainless steel tube. ### Claim 20 (depends on 1) The transmission system of claim 1, wherein the MCEI trough comprises a nonconductive polymeric filler.