Patent ID: 7362235

Claim:
A drilling telemetry system comprising: a plurality of communications packages in association with a plurality of drill pipe segments, each pipe segment having an outer surface, and an inner surface, and two ends bearing threads that enable the drill pipe segments to be assembled to form a drill pipe, with each communications package comprising: i) a first wire coil, having a first impedance, adapted to function as an inductance transmitter, ii) a second wire coil, having a second impedance, adapted to function as an inductance receiver, iii) connecting wire, having a length and a third impedance, adapted to electrically adjoin the first wire coil to the second wire coil, iv) first and second insulating packages, each comprising a magnetic component and an electrically and magnetically insulating component and v) a polyethylene sleeve wherein the first wire coil is positioned at one end of a drill pipe segment, the second wire coil is positioned at the other end of the same drill pipe segment, the connecting wire is positioned so that at least a portion of its length lies between the polyethylene sleeve and the inner surface of the pipe segment, and further wherein first, second and third impedances for a given communications package contribute to a total impedance associated with that communications package that substantially matches total impedance associated with at least one other communications package in the drilling telemetry system.