Downhole bearing assembly

Details Downhole bearing assembly Downhole bearing assembly

1985-01-18

1986-06-10

Novosad, Stephen J.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175320, 384 93, 384607, 277 92, E21B 402

Patent

active

045937745

ABSTRACT:
A downhole bearing assembly includes concentric inner and outer tubes, with bearings mounted therebetween. A high pressure elastomeric cup seal assembly is mounted between the inner and outer tubes, and at least one metal-to-metal seal is mounted between the inner and outer tubes on each side of the high pressure seal assembly. A pair of pressure balancing systems are provided, each acting to minimize pressure differentials across a respective one of the metal-to-metal seals. The metal-to-metal seals protect the high pressure elastomeric seal assembly and the bearings from contamination by drilling mud, and the pressure balancing systems protect the metal-to-metal seals from excessive differential pressures.

REFERENCES:
patent: 3894818 (1973-04-01), Tschirky
patent: 4077634 (1978-03-01), Durham
patent: 4260202 (1981-04-01), Crase et al.
patent: 4320929 (1982-03-01), Clark et al.
patent: 4329127 (1982-05-01), Tschirky et al.
patent: 4335791 (1982-06-01), Evans
patent: 4453604 (1984-06-01), Ioanesian et al.

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