Fluid handling – Systems – Programmer or timer
Patent
1996-09-11
1998-11-17
Hepperle, Stephen M.
Fluid handling
Systems
Programmer or timer
1375991, 175 50, 251 3001, 251 611, G01V 152
Patent
active
058363530
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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Hepperle Stephen M.
Scientific Drilling International Inc.
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