Drill bit and method for reducing formation fluid invasion and for improved drilling in plastic formations
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United States of America Patent
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-
Apr 6, 1993
Grant Date -
N/A
app pub date -
Sep 16, 1991
filing date -
Sep 16, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drill bit and method in which polycrystalline diamond cutters mounted on a bit crown cut formation chips akin to the manner in which a grater cuts cheese. Chips in impermeable or plastic formations are extruded by the cutters into cavities internal to the bit via slots adjacent each cutter. Drilling fluid circulates internally of the bit from the drill string and into the annulus above that portion of the bit bearing cutters. In one embodiment, the portion of the bit body upon which the crown is formed is made of an elastomer which is pressurized into sealing engagement with the bottom of the borehole thereby further sealing freshly cut formation from drilling fluid.
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