A system includes a drill string made up of a plurality of connectable pipe sections. An assembly is provided for use with each pipe section including contact arrangement for forming an isolated electrical connection between attached pipe sections at each end of each pipe section. An electrically conductive...http://www.google.fr/patents/US7028779?utm_source=gb-gplus-shareBrevet US7028779 - Auto-extending/retracting electrically isolated conductors in a segmented drill string
Auto-extending/retracting electrically isolated conductors in a segmented ...
