Servo valve for well-logging telemetry

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

E - Fixed Constructions

21

B

166/3

E21B 47/04 (2006.01) E21B 47/18 (2006.01)

Patent

CA 1162143

13368:RRP:k SERVO VALVE FOR WELL-LOGGING TELEMETRY Abstract of the Disclosure 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 occuring during drilling, and the closure member and associated valve seat are field replace- able. Primary power for valve actuation is drawn from the drilling-fluid hydraulic energy as controlled by a low-power solenoid-actuated pilot valve.

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