Servo-driven mud pulser

Details Servo-driven mud pulser Servo-driven mud pulser

1996-07-25

2000-01-18

Oda, Christine

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

367 83, 181102, G01V 140

Patent

active

060162880

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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