Dual spring drill string shock absorber

Details Dual spring drill string shock absorber Dual spring drill string shock absorber

1978-02-21

1980-02-05

Myhre, Charles J.

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

175321, F16D 306, E21B 742

Patent

active

041865693

ABSTRACT:
A drill string shock absorber has a dual spring system for absorbing vibrations and shock loads during rotary well bore drilling operations. A first spring acts in compression when sufficient weight is set down on the drill bit through the shock absorber to overcome the fluid pressure forces tending to extend the shock absorber, and a second spring acts in compression when the weight applied to the bit through the shock absorber does not overcome the fluid pressure forces. A splined connection transmits torque to the shock absorber during drilling operations, and seals are provided between the telescopic shock absorber components for confining therein a body of lubricant, the pressure of which is equalized with the pressure of drilling fluid flowing through the shock absorber.

REFERENCES:
patent: 2712435 (1955-07-01), Allen
patent: 3311180 (1967-03-01), Gilreath
patent: 3382936 (1968-05-01), Galle
patent: 3447797 (1969-06-01), Roberts
patent: 3770232 (1973-11-01), Blake
patent: 3834472 (1974-09-01), Perkins
patent: 3884051 (1975-05-01), Bottoms
patent: 3949150 (1976-04-01), Mason
patent: 3998433 (1976-12-01), Webb

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