Casing drilling shoe
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United States of America Patent
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Sep 3, 2002
Grant Date -
N/A
app pub date -
Feb 20, 2001
filing date -
Jun 11, 1998
priority date (Note) -
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Abstract
A casing drilling shoe adapted for attachment to a casing string and comprising an outer drilling section constructed of a relatively hard material such as steel and an inner section constructed of a readily drillable material such as aluminum. The drilling shoe further includes a device for controllably displacing the outer drilling section to enable the shoe to be drilled through using a standard drill bit and subsequently penetrated by a reduced diameter casing string or liner.
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