Double acting shock absorbers for drill strings

Details Double acting shock absorbers for drill strings Double acting shock absorbers for drill strings

1978-06-28

1980-03-25

Purser, Ernest R.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

175227, 175299, 267 71, 267137, E21B 1704

Patent

active

041945824

ABSTRACT:
A telescopic shock absorber for incorporation in a drill string connected to a rotary bit for drilling a bore hole in earth formations, the shock absorber including a single spring assembly which is compressed downwardly when sufficient downwardly directed drilling weight is transmitted from the drill string through the shock absorber to the drill bit, and which is compressed upwardly when the internal drilling fluid pressure in the shock absorber fully overcomes the downwardly directed drilling weight, assuring that the spring assembly is in its compressed condition when the shock absorber is telescoped or extended, enabling it to absorb shocks and vibrations incident to the drilling operation and under both conditions.

REFERENCES:
patent: 2372214 (1945-03-01), Loepsinger
patent: 2665902 (1954-01-01), Allen
patent: 3735827 (1973-05-01), Berryman
patent: 3871193 (1975-03-01), Young
patent: 3949150 (1976-04-01), Mason et al.

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