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The float shoe or float collar is a kind of
casing shoe or coupling which can
produce buoyancy. With advantages of
high temperature resistance, good
sealing feature and easy connection, it
can be used to replace guide shoe or
casing shoe. The float shoe and float
collar are not only used in unclassified
technical casing, oil layer casing but
also in deep well, extra-deep well and
special technology well. The float shoe
which is connected at end of casing
string functions as guide or back
pressure valve. The float collar which is
connected at 20~30 meters from the
end of casing serves the functions of
supporting ring and back pressure valve.