Hydraulic power unit for measurement while drilling apparatus

Details Hydraulic power unit for measurement while drilling apparatus Hydraulic power unit for measurement while drilling apparatus

1982-11-01

1984-11-20

Suchfield, George A.

Wells

Combined

33307, 175 40, 175 93, E21B 4712

Patent

active

044833946

ABSTRACT:
A hydraulic power unit is provided for a downhole instrument of a measurement while drilling system for a well drilling. The hydraulic power unit is enclosed within a drill collar that is connected in the drill string of a rotary drilling rig. An outer body sleeve is rigidly mounted in the instrument drill collar. A fixed inner sleeve is connected to the outer body sleeve in a concentric relation with a longitudinally movable plunger assembly supported therebetween and movable in the telescopic fashion between an extended position and a retracted position to provide hydraulic power fluid for the hydraulically powered circuits of the instrument.

REFERENCES:
patent: 3303573 (1967-02-01), Alder et al.
patent: 4184545 (1980-01-01), Claycomb
patent: 4235021 (1980-11-01), Claycomb
patent: 4266606 (1981-05-01), Stone
patent: 4351037 (1982-09-01), Scherbatskoy
patent: 4371958 (1983-02-01), Claycomb

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