Servo valve for well-logging telemetry

Details Servo valve for well-logging telemetry Servo valve for well-logging telemetry

1980-09-25

1983-05-31

Birmiel, Howard A.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

175 40, 175 50, 367 83, G01V 140

Patent

active

043864228

ABSTRACT:
A monostable valve for insertion in a drill string used in forming a borehole such as an oil well. In an open position, the valve vents drilling fluid flowing in the drill string to an annulus in the borehole for return flow to the surface, thus generating a surface-detectable negative fluid-pressure pulse. A valve closure member is supported for horizontal movement to provide significant isolation from vertical accelerations occurring during drilling, and the closure member and associated valve seat are field replaceable. Primary power for valve actuation is drawn from the drilling-fluid hydraulic energy as controlled by a low-power solenoid-actuated pilot valve.

REFERENCES:
patent: 2759143 (1956-08-01), Arps
patent: 3737843 (1973-06-01), Le Peuvedic et al.
patent: 3958217 (1976-05-01), Spinnler
patent: 4078620 (1978-03-01), Westlake et al.
patent: 4266606 (1981-05-01), Stone

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