Pulse production and control in drill strings

Details Pulse production and control in drill strings Pulse production and control in drill strings

1996-08-21

1998-04-14

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

175 40, 33307, F16K 3104, E21B 47022, G01V 140

Patent

active

057401276

ABSTRACT:
In fluid pulsing apparatus operable in a drill pipe in a well in which well drilling fluid flows, wherein pressure pulses are created by restricting one or more of several hydraulically parallel paths, constant working pressure regulating valves with a long time constant relative to the transient pulses are constructed in the hydraulically parallel paths. The valves operate to produce a more consistent pulse character allowing production of pulses at low flow rates of drilling fluid that are of sufficient amplitude to be more easily detected on the Earth's surface and restriction of amplitude of pressure pulses at high flow rates of drilling fluid to limit equipment damage and loss of hydraulic energy. The valves function by varying the flowing cross sectional area of the hydraulically parallel paths.

REFERENCES:
patent: 4771408 (1988-09-01), Rotlyar
patent: 5272680 (1993-12-01), Stane et al.

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