PROCEDIMENTO E DISPOSIZIONE PER LA TRASMISSIONE DI INFORMAZIONI PARAMETRI E DATI AD UN ORGANO ELETTROMAGNETICO DI RICEZIONE O DI COMANDO ASSOCIATO AD UNA CONDOTTA SOTTERRANEA DI GRANDE LUNGHEZZA

Information can be transmitted between equipment at the bottom of a drilling operation and the surface. A transceiver is provided at the surface, and is connected to both the earth, or the bottom of the ocean in an offshore operation, spaced from the drilling operation, and metal pipework used in the drilling operation. A transmitter/receiver is used for applying and receiving electric signals between two points on the metal pipework. The two points are separated at a substantial distance along the metal pipework such that the resistance of the metal pipework connecting the two points is relatively low but greater than zero. No insulating junction is then needed to be interposed between the two points in the metal pipework connecting the two points. Preferably, the transmitter/receiver has upper and lower conductors with first and second polar ends at the two points, thus forming a dipole of substantial length across the metal pipework.