A combination of a metal coiled tubing and a signal transmitting passageway for transmitting and/or receiving signals to well tools positioned in the coiled tubing. The signal transmitting passageway is positioned in the wall of the coiled tubing and may transmit and receive hydraulic, electrical or...http://www.google.fr/patents/US5542472?utm_source=gb-gplus-shareBrevet US5542472 - Metal coiled tubing with signal transmitting passageway
Metal coiled tubing with signal transmitting passageway
