Rotary servo pulser and method of using the same
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United States of America Patent
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Sep 15, 2015
Grant Date -
May 8, 2014
app pub date -
Jan 22, 2013
filing date -
Nov 7, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A servo pulser used to actuate a pulser valve and create pressure pulses in downhole measurement while drilling tools is described. An electric gearmotor is used to rotate a shaft which in turn operates a servo valve. A facing portion of the shaft is compressed onto the face of a servo seat having passages connected to the inside of a drill collar and the rotating action is used to open and/or obstruct a fluid path through those passages. The shaft may include wear-resistant tips to obstruct the fluid path. Part of the torque-transmitting apparatus between the gearmotor and the shaft can be hydrostatically compensated, and part sealed against the operating environment. A magnetic torque coupler may be used as part of the torque-transmitting apparatus between the gearmotor and the shaft. The servo pulser is coupled to a pulser valve, a power source and a sensor package all of which reside inside a short section of drill pipe near the bottom of well bore being drilled.
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