Rotary drill bits and method of use
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United States of America Patent
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Aug 9, 1983
Grant Date -
N/A
app pub date -
Jan 2, 1981
filing date -
Jan 16, 1980
priority date (Note) -
Expired
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Abstract
A rotary drill bit for use in subsurface formations includes fluid channels for the passage of drilling mud to remove cuttings. According to the invention to clear blockages there are only one or two unbranched channels for the passage of mud past the cutting elements and these are arranged in a spiral.
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