Servo-driven mud pulser
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United States of America Patent
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-
Jan 18, 2000
Issued Date -
N/A
app pub date -
Jul 25, 1996
filing date -
Dec 5, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved servo-driven pulser is disclosed, for use in measurement while drilling applications. In the pulser, a battery powered on-board DC electric motor is used to operate a servo-valve, which in turn adjusts internal tool fluid pressures to cause operation of a main valve to substantially reduce mud flow to a drill bit, thereby creating a positive pressure pulse detectable at the surface. De-energizing the motor driving the pilot valve results in re-adjustment of internal fluid pressures, causing the main valve to reopen, thereby terminating the pressure pulse.
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