Neftegaz.RU #3-17 ENG

SPECIAL SECTION
Classifier
INSERT BITS
1. Drilling
equipment and
instruments
1.1.1.12 Drilling tools
1.1.1.12.1 Bore bits
Insert bit is crumble and crumblesliding
instrument, applied for rock
breaking. The main operating unit
is the roller hit features the coneelement,
made from steel. The
cutting structure of the roller hit is
lobes of different length or dowels,
made from tungsten carbide.
This cemented carbide is used
for breaking different geological
material as soft, as sufficiently hard.
Insert bit is the system the rotation
around of its axis is possible due to
the rotation of the housing. In the
result of operating the mechanism,
the breaking of the geological
material in place with the lobes in a
contact with them is made. Rolling
hits have the special design: the
presence a lot of lobes, placed in a
special way. They are positioned in
a way that the geological material
is broken on the whole girth of the
place.
Insert hits have some important
systems: greasing and cleaning.
The equipment may be
manufactured with the side or
central cleaning system. In the first
variant, the fluid from the holes
is directed on the roller hit. At the
presence the special strips on the
holes, the system is called water jet
system.
The usage of the
insert hits
For drilling gas/oil wells the insert
hits equipped with cone roller hits
are applied.
The instrument is widely used for
drilling the exploration, gas and oil
wells. The y also applied in mining
and building. The hits have a lot of
advantages. They are:
• Sufficient contact surface with
the place.
• Long length of the cutting edge
that increases the efficiency
when operating with the
instruments.
• Low level of lobes crumbling.
• Short roll torque, so the danger
of the insert hit jamming is
minimum.
[3] Neftegaz.RU ~ 47