Choke device

Details Choke device Choke device

1997-07-22

2000-09-12

Neuder, William

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

175 61, E21B 708

Patent

active

061163554

ABSTRACT:
A choke device for controlling fluid flow, particularly in a modulated bias unit, drill bit or other item downhole drilling component, comprises a passage for the flow of fluid, a choke aperture separating an upstream portion of the passage from a downstream portion thereof, and an impingement surface located in the downstream portion of the passage opposite and spaced from the choke aperture, so that fluid flowing through the choke aperture impinges on the impingement surface. The impingement surface is formed from superhard material, such as polycrystalline diamond, and may comprise the front facing table of a two-layer polycrystalline diamond compact of the kind used as cutting elements in drag-type drill bits.

REFERENCES:
patent: 5673763 (1997-10-01), Thorp

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