Dual channel downhole telemetry

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids

Reexamination Certificate

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Details

C340S854300, C340S854400, C340S854600

Reexamination Certificate

active

06909667

ABSTRACT:
The present disclosure provides several methods for selecting and transmitting information from downhole using more than one channel of communication wherein data streams transmitted up each communications channel are each independently interpretable without reference to data provided up the other of the communications channels. Preferred embodiments incorporate the use of a combination of at least two of mud-based telemetry, tubular-based telemetry, and electromagnetic telemetry to achieve improved results and take advantage of opportunities presented by the differences between the different channels of communication.

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PCT International Search Report dated Oct. 10, 2003 for PCT/US03/04427.

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