Percussion rotary air blast drilling Manufacturers,
Exporter & Suppliers
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RAB drilling is used most
frequently in the mineral exploration industry. The
drill uses a pneumatic reciprocating piston-driven
'hammer' to energetically drive a heavy drill bit into
the rock. The drill bit is hollow, solid steel and has
~20 mm thick tungsten rods protruding from the steel
matrix as 'buttons'. The tungsten buttons are the
cutting face of the bit.
The cuttings are blown up the outside of the rods and
collected at surface. Air or a combination of air and
foam lift the cuttings.
RAB drilling is used primarily for mineral exploration,
water bore drilling and blast-hole drilling in mines, as
well as for other applications such as engineering, etc.
RAB produces lower quality samples because the cuttings
are blown up the outside of the rods and can be
contaminated from contact with other rocks. RAB drilling
rarely achieves more than 150 metres depth as
encountering water rapidly clogs the outside of the hole
with debris, precluding removal of drill cuttings from
the hole.
This can be counteracted, however, with the use of 'stabilisers'
also known as 'reamers', which are large cylindrical
pieces of steel attached to the drill string, and made
to perfectly fit the size of the hole being drilled.
These have sets of rollers on the side, usually with
tungsten buttons, that constantly break down cuttings
being pushed upwards.
The use of multiple high-powered air compressors, which
push 900-1150cfm of air at 300-350psi down the hole also
ensures drilling of a deeper hole up to ~1250m due to
higher air pressure which pushes all rock cuttings and
any water to the surface. This, of course, is all
dependant on the density and weight of the rock being
drilled, and on how worn the drill bit is. |
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