Flat bottom drilling bit with polycrystalline cutters
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United States of America Patent
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-
Oct 10, 1989
Issued Date -
N/A
app pub date -
Oct 13, 1988
filing date -
Jan 16, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An earth drilling bit with a body having a flat bottom. A plurality of cutting elements positioned on the flat bottom including a polycrystalline diamond cutter. The cutters include an elongate apex with a face on both sides of the apex extending backwardly from the apex. The apex extends generally vertically with a slight rake for providing a chisel surface for acting on the earth even when when the cutter becomes worn. The cutter may include multiple apexes and have zero side rake. A plurality of fluid circulating channels are provided in the flat bottom and vertically along the outside of the body and a plurality of fluid nozzles are directed outwardly at an angle to the longitudinal axis of the body.
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