Choke device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Sep 12, 2000
Issued Date -
N/A
app pub date -
Jul 22, 1997
filing date -
Jun 4, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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