Frequency modulated mud pulse telemetry apparatus and method
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United States of America Patent
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Aug 22, 2017
Issued Date -
Sep 8, 2016
app pub date -
Mar 2, 2016
filing date -
Mar 2, 2015
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Abstract
An apparatus and method to improve transmission of mud pulse telemetry signals is described. A mud pulser is placed in series with a water hammer pulse valve. While generating pulse signals, the mud pulser modulates the flow of mud downstream to the pulse valve. The pulse valve, which cycles at a frequency that is proportional to the flow rate through the tool, operates at a frequency that is effectively modulated by the mud pulser. A sensor that may be at the surface receives a mud pulse signal that comprises both an amplitude modulated component as well as a frequency modulated component.
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