Fishtail expendable diamond drag bit
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United States of America Patent
Stats
-
Apr 14, 1992
Grant Date -
N/A
app pub date -
Oct 30, 1990
filing date -
Oct 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fishtail type drag bit is disclosed consisting of multiple blades, each blade forming radially disposed grooves. Each groove contains equidistantly spaced diamond cutters along its length. The cutters are additionally oriented at a negative rake angle with respect to a borehole bottom. The vertical alignment of the diamond cutters paralleling an axis of the bit are staggered to destroy kerfs which remain in the formation from preceding eroded rows of diamond cutters as the bit works in the borehole.
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