System and method for downhole telemetry

摘要

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.

主权项

1. A method of adapting a commercially available measurement while drilling tool to provide a dual telemetry measurement while drilling tool, the commercially available measurement while drilling tool providing a first transmission module providing one of mud pulse telemetry and electromagnetic telemetry, the method comprising:
obtaining a second transmission module providing the other of mud pulse telemetry and electromagnetic telemetry; and connecting a directional module operable to obtain data from at least one sensor to the first transmission module and the second transmission module to enable the data to be provided to both modules.