Earth drilling lubricated hydraulic shock absorber and method

Details Earth drilling lubricated hydraulic shock absorber and method Earth drilling lubricated hydraulic shock absorber and method

1979-04-19

1981-12-01

Leppink, James A.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

64 23, 175321, 277 59, E21B 2100, E21B 4100

Patent

active

043031382

ABSTRACT:
Earth drilling hydraulic shock absorber having an anvil reciprocally mounted in a casing and operatively connected with a plurality of independently operating pistons, the anvil being reciprocally mounted within the casing through a spline connection with unidirectional sealing means for equalizing pressure across the sealing means with the hydrostatic pressure in a borehole for retaining a lubricating fluid around the spline connection and to prevent abrasive matter in drilling fluid from coming in contact with the spline connection. The anvil of the shock absorber may include a reduced effective pressure area so that the anvil engages the first piston at a lower downweight.

REFERENCES:
patent: 2979350 (1961-04-01), Lansky
patent: 3190374 (1965-06-01), Caperan et al.
patent: 3225566 (1965-12-01), Leathers
patent: 3866924 (1975-02-01), French
patent: 3866988 (1975-02-01), Striegler
patent: 4054040 (1977-10-01), Medders
patent: 4055107 (1977-10-01), Bartley
patent: 4194582 (1980-03-01), Ostertag

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