Hydraulic circuit for borehole telemetry apparatus

Details Hydraulic circuit for borehole telemetry apparatus Hydraulic circuit for borehole telemetry apparatus

1979-08-27

1981-05-12

Purser, Ernest R.

Wells

Combined

73151, 13762413, 166319, 367 85, E21B 4700

Patent

active

042666066

ABSTRACT:
A hydraulic circuit for borehole telemetry apparatus is presented wherein a mud pulse valve is operated by hydraulic pressure applied to differential areas of an actuating piston. The system includes a hydraulic pump, a filter in the line between the pump and the piston to be actuated, an accumulator upstream of the filter, a regulating and relief valve downstream of the filter, and solenoid actuated valves to control delivery of hydraulic fluid to the piston. The system also includes a pressure compensating bellows to compensate for changes in pressure in the drilling mud.

REFERENCES:
patent: 3693428 (1972-09-01), Le Peuvedic et al.
patent: 3737843 (1973-06-01), Le Peuvedic et al.
patent: 3756076 (1973-09-01), Quichaud et al.
patent: 4184545 (1980-01-01), Claycomb

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