Drillout bi-center bit
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United States of America Patent
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May 28, 2002
Grant Date -
N/A
app pub date -
Sep 11, 2000
filing date -
Oct 28, 1999
priority date (Note) -
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Abstract
The present invention is a bi-center drill bit designed to drill out the cement and other material in the casing and then proceed to drill out the full gauge drilling diameter borehole with a diameter greater than the inside of the casing. The bi-center drill bit is configured with non-drilling bearing elements that contact with the casing when the bit is drilling the cement without allowing the gauge cutting elements of the bi-center drill bit to contact the casing. The bi-center drill bit also has a cutting element configuration which prevents reverse scraping of the cutting elements when drilling both the cement and the formation.
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