	US 12,454,886 B2
	Well installation electrical transmission systems
Steven Martin Hudson, Aberdeen Aberdeenshire (GB); and Leslie David Jarvis, Aberdeen Aberdeenshire (GB)
Assigned to METROL TECHNOLOGY LTD, Aberdeenshire (GB)
Appl. No. 18/702,238
Filed by METROL TECHNOLOGY LTD, Aberdeen Aberdeenshire (GB)
PCT Filed Oct. 20, 2022, PCT No. PCT/GB2022/052674 § 371(c)(1), (2) Date Apr. 17, 2024, PCT Pub. No. WO2023/067342, PCT Pub. Date Apr. 27, 2023.
Claims priority of application No. 2115110 (GB), filed on Oct. 21, 2021.
Prior Publication US 2024/0401472 A1, Dec. 5, 2024
Int. Cl. E21B 47/12 (2012.01); E21B 34/06 (2006.01); E21B 41/00 (2006.01); E21B 41/02 (2006.01); H02J 50/00 (2016.01)

CPC E21B 47/12 (2013.01) [E21B 41/0007 (2013.01); E21B 41/02 (2013.01); E21B 34/066 (2013.01); H02J 50/001 (2020.01)]

33 Claims

1. A well installation electrical transmission system for use in a well installation comprising downhole metallic structure provided in a borehole and a platform provided above the level of the borehole and for the transmission of at least one of electrical power and electrical communication signals between an out of hole station and a downhole station via a transmission path that comprises at least a portion of the downhole metallic structure, wherein the well installation comprises an impressed current cathodic protection system, the out of hole station is arranged to modulate the current applied to the downhole metallic structure by the impressed current cathodic protection system to apply at least one of electrical power and electrical communication signals to the transmission path and the downhole station is arranged for picking up from the transmission path said at least one of electrical power and electrical communication signals, wherein the out of hole station is arranged to modulate the current applied to the downhole metallic structure in such a way that the average current applied by the impressed current cathodic protection system is substantially unchanged by the modulation.