Method and apparatus for selectively leaching portions of PDC cutters already mounted in drill bits
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United States of America Patent
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Jul 20, 2010
Grant Date -
Jan 21, 2010
app pub date -
Jul 18, 2008
filing date -
Jul 18, 2008
priority date (Note) -
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Abstract
A polycrystalline diamond compact (PDC) drill bit having a plurality of PDC cutters, each having a body of diamond crystals containing catalyzing material, is coated with a material which is impervious to a given acid. After the coating is dried, a segment of the coating is removed and acid is supplied to the body of diamond crystals to leach out the catalyzing material contained within the exposed portion of the body.
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