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A telegrapher equation for electric - telemetering in drill strings

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2 Author(s)
Carcione, Jose M. ; Ist. Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy ; Poletto, F.

A reliable method of transmitting downhole information to the surface while drilling is essential to improve drilling applications. We have designed a numerical algorithm for simulation of electric-signal transmission through the drill string, based on the telegrapher equation (a circuit model). The drill string is then represented by a transmission line with varying geometrical and electromagnetic properties versus depth, depending on the characteristics of the drill string/formation system. These properties are implicitly modeled by the series impedance and the shunt admittance of the transmission line. The telegrapher equation is solved in the high-frequency range by using a direct method

Published in:

Geoscience and Remote Sensing, IEEE Transactions on  (Volume:40 ,  Issue: 5 )

Date of Publication:

May 2002

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