EXTENDED RANGE EMF ANTENNA

摘要

A measuring while drilling system (28) typically has a metal pipework (16) extending underground connected to an antenna (26a). The metal pipework (16) and the antenna (26a) are both connected to a type of downhole equipment. The antenna (26a) transmits or receives signals to/from a transceiver (18) located on the surface, and the transceiver (18) is connected to the metal pipeword (16) and to a ground (24). The system is improved by joining a plurality of sections of wired drill pipe (40) together to form a section where the antenna (26a) is integral with the metal pipework (16). One end of the section of wired drill pipe (40) is joined to downhole equipment and another end is joined to a conventional metal pipework (16).