Gap-sub assembly for a downhole telemetry system

Details Gap-sub assembly for a downhole telemetry system Gap-sub assembly for a downhole telemetry system

H - Electricity

01

B

H01B 17/56 (2006.01) E21B 47/12 (2012.01)

Patent

CA 2634236

A system and method are provided for providing electromagnetic (EM) measurement-while--drilling (MWD) telemetry capabilities using an existing mud-pulse MWD tool. An EM tool intercepts the output from the mud-pulse tool and generates an EM signal that mimics a mud-pulse pressure signal. The EM signal is intercepted at the surface by a receiver module that conditions the signal and inputs the signal into the existing pulse tool receiver. Since the EM signal mimics a mud-pulse signal, the pulse tool receiver does not require software or hardware modifications in order to process an EM telemetry mode. The EM tool can be adapted to also provide dual telemetry by incorporating a conventional pressure pulser that would normally be used with the pulse tool.

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