Downhole motor fluid flow restrictor

Details Downhole motor fluid flow restrictor Downhole motor fluid flow restrictor

1983-10-26

1985-10-15

Novosad, Stephen J.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175324, E21B 402

Patent

active

045468362

ABSTRACT:
A downhole drilling motor located near the end of a rotary drill string is powered by the drilling fluid for driving a rotary drill bit for the drilling of an oil or gas well or the like. Substantially all of the drilling fluid that exits the power producing section is channeled toward the nozzles of the drill bit with a small portion being diverted through the bearings of the motor. A series of elastomer flow restrictor elements, each responding to increased fluid pressure by reducing the flow area therethrough, controls the fluid flow through the bearings to within a narrow range of flow rates.

REFERENCES:
patent: 2908534 (1959-10-01), Rietsch
patent: 3194325 (1965-07-01), Gianelloni
patent: 3456746 (1969-07-01), Garrison et al.
patent: 3858668 (1975-01-01), Bell
patent: 3879094 (1975-04-01), Tschirky et al.
patent: 3936247 (1976-02-01), Tschirky et al.
patent: 3982859 (1976-09-01), Tschirky et al.
patent: 4029368 (1977-06-01), Tschirky et al.

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