Casing tube with casing shoe
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United States of America Patent
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-
Sep 29, 1998
Grant Date -
N/A
app pub date -
Mar 31, 1997
filing date -
Apr 21, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A casing tube formed from plastic and a casing shoe formed from metal are provided for drilling in layers of earth or rock. The casing shoe is locked to the casing tube by threads, grooves or flanges provided on a reduced diameter portion of the casing shoe. A tube-formed extension is provided in the casing shoe for protecting the casing tube from damage during a drilling operation.
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