Communications: electrical – Wellbore telemetering or control
Patent
1997-05-27
1998-11-03
Horabik, Michael
Communications: electrical
Wellbore telemetering or control
7315203, G01V 300
Patent
active
058315497
ABSTRACT:
This disclosure sets forth an electromagnetic measurement-while-drilling telemetry system, and more particularly, a telemetry system which utilizes a gas filled, metallic, tubular wave guide as a conduit between a downhole transmitter element and a surface receiver element. The tubular wave guide is positioned preferably concentrically within a drill string such as coiled tubing or conventional, rigid drill pipe. A valving system allows the tubular wave guide to be filled with gas, while the annulus between the inner conduit and the drill string is filled with drilling fluid. The preferred transmission frequency in the 20 to 40 gigaHertz range using a transverse electrical-circular pattern (TEO.sub.0.1) wave transmission mode. Data transmission rates using the disclosed system are much greater that those obtained with mud pulsing systems, and attenuation rates are much lower than those obtained with electromagnetic systems using liquid filled wave guides.
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patent: 4814768 (1989-03-01), Chang
Low-Loss Waveguide Transmission, S.E. Miller, Member, Ire And A. C. Beck, Senior Member, Ire, Proc., I.R.E., Mar., 1951 pp. 348-358.
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Waveguide as a Communiation Medium, S. E. Miller, The Cell System Technical Journal, vol. 33, No. 6, Nov., 1954, pp. 1209-1265.
IEEE Transactions On Microwave Theory And Techniques, Sep., p. 19.
Horabik Michael
Wong Albert K.
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