Apparatus for applying pressure to fluid seals

Details Apparatus for applying pressure to fluid seals Apparatus for applying pressure to fluid seals

1981-06-15

1983-02-08

Pate, III, William F.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175228, E21B 402

Patent

active

043724000

ABSTRACT:
An apparatus is provided for applying pressure to a fluid seal positioned between a reservoir of a first fluid, such as lubricating fluid, and a source of a second fluid under pressure, such as a drilling fluid in a downhole drilling apparatus. A piston is positioned in a cavity which is in fluid communication with the first fluid reservoir. The piston sealably and slidably engages the side walls of the cavity. A spring moves the piston in a direction to increase the pressure of the first fluid to a value which exceeds the pressure value of a second fluid. Thus, the second fluid is prevented from passing through the fluid seal and contaminating the first fluid.

REFERENCES:
patent: 2646962 (1953-07-01), Wagu
patent: 3062305 (1962-11-01), Sutliff
patent: 3220496 (1965-11-01), Beck
patent: 3303898 (1967-02-01), Bercarn
patent: 3659662 (1972-05-01), Dicky

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