A telegrapher equation for electric - telemetering in drill strings

Author

Carcione, José M. ; Poletto, Flavio

Author_Institution

Ist. Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy

Volume

40

Issue

5

fYear

2002

fDate

5/1/2002 12:00:00 AM

Firstpage

1047

Lastpage

1053

Abstract

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

Keywords

geophysical signal processing; geophysical techniques; telemetry; borehole method; circuit model; downhole information; drill string; drilling; electric telemetering; electric-signal transmission; geology; geophysical measurement technique; impedance; numerical algorithm; reliable method; shunt admittance; simulation; telegrapher equation; transmission line; well logging; Attenuation; Conductivity; Distributed parameter circuits; Drilling; Equations; Frequency; Insulation; Satellite ground stations; Telemetry; Transmission line theory;

fLanguage

English

Journal_Title

Geoscience and Remote Sensing, IEEE Transactions on

Publisher

ieee

ISSN

0196-2892

Type

jour

DOI

10.1109/TGRS.2002.1010892

Filename

1010892