Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent
1990-11-01
1992-04-07
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through well fluids
367 83, 175 50, 251282, G01V 140
Patent
active
051034301
ABSTRACT:
A downhole signal generating mud pulser has a poppet and orifice signal valve to variably resist the drilling fluid stream. The poppet is upstream of the orifice and is moved by a piston in fluid communication with opposite flow related sides of the signal valve such that more pressure drop across the valve applies more piston force to open the valve. The poppet is spring biased toward the orifice and the piston force and spring balance when a preselected operating pressure exists. A servo valve controls flow in a by-pass loop to apply additional pressure to the piston to create a signal pulse when open. The servo valve is urged closed by flow in the servo loop and the closing is retarded by a dashpot to determine signal duration. The servo valve is spring biased to open and is automatically latched closed by a latch that responds to a solenoid actuated to release the servo valve. Options include replacement of the dashpot timer with a second latch position which latches the servo valve open to cause a signal pulse, the duration of which is determined by the controlling instrument which acts to release the latch from both positions.
REFERENCES:
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patent: 4825421 (1989-04-01), Jeter
patent: 4869100 (1989-09-01), Birdwell
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patent: 4901290 (1990-02-01), Feld et al.
patent: 4986512 (1991-01-01), Tiefenthaler
Earl Leon M.
Jeter John D.
Landry Merlin P.
Jeter John D.
Moskowitz Nelson
The Bob Fournet Company
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