Valve assembly for borehole telemetry in drilling fluid
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United States of America Patent
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-
Nov 17, 1998
Grant Date -
N/A
app pub date -
Sep 11, 1996
filing date -
Sep 11, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Pressure pulses in a flowing stream are generated by movement radially of an elastomer membrane surrounding a perforated tube. Movement outward of the membrane is initiated by closing of a pilot valve in the tube, but is accelerated by pressure increases from decreasing flow area around the membrane. Opening of the pilot valve allows the membrane to return to its collapsed condition. Selection of flow area around the expanded membrane allows selection of pulse amplitude. Signals from a variety of downhole instruments are provided to a driver of the pilot valve, so that pressure pulses from operation of the membrane can be detected uphole in a well.
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