دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: the teeth or tungsten carbide inserts in the outermost row on the cones of a bit, so called because they cut the outside edge of the hole and determine the holes gauge or sire. Also called heel teeth.

n: outermost tooth of cone bit.the reason of this name is that they cut
wellbore outermost part and determine the diameter of wellbore.the
outermost tooth is usually shaped II pattern、I pattern、L pattern to prevent excessive wear of the bit diameter。