Tubular drill pipe, for e.g. oil field, has signal transmitting unit including flat electrical conductor insulated from internal surface of wall of pipe, where surface covers resin forming insulating coating

摘要

A tubular drill pipe has a signal transmitting unit including a flat electrical conductor (28) including cross perforations, fixed along a lower surface of a wall of the drill pipe by an insulating glue (29) and insulated from the lower surface. The surface encloses a resin (30) forming an insulating coating. Two windings are electromagnetic coupled to an antenna and to the flat conductor through insulated wires.