| QUESNEL BROS. |
DIAMOND DRILLING LTD.
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| When your work speaks for itself, don't interrupt. |
Diamond Drilling or Exploration Diamond Drilling makes use of
an annular diamond-impregnated drill bit attached to the end of
hollow drill rods to cut a cylindrical core of solid rock (core
samples). Diamond size and matrix can be varied according to
the hardness of rock needing to be cut. Holes within the bit
allow water to be delivered to the cutting face. This provides
lubrication, cooling, and removal of drill cuttings from the hole.
Once the desired depth is reached, a hollow tube (lifter tube) is
lowered into the rod with a winch cable until it stops inside the
core barrel. As the core is drilled, the core lifter slides over
the core as it is cut. An overshot attached to the end of the
winch cable is lowered inside the rod string and locks on to the
"backend", located on the top end of the lifter tube. The winch
is retracted, pulling the lifter tube to the surface. A
core-lifter-spring at the bottom of the tube prevents the core
from dropping out. The core samples are then washed,
measured, and catalogued for analysis by a geologist.
Drilling is done slowly and carefully to preserve the life of
expensive drill bits and rods.
an annular diamond-impregnated drill bit attached to the end of
hollow drill rods to cut a cylindrical core of solid rock (core
samples). Diamond size and matrix can be varied according to
the hardness of rock needing to be cut. Holes within the bit
allow water to be delivered to the cutting face. This provides
lubrication, cooling, and removal of drill cuttings from the hole.
Once the desired depth is reached, a hollow tube (lifter tube) is
lowered into the rod with a winch cable until it stops inside the
core barrel. As the core is drilled, the core lifter slides over
the core as it is cut. An overshot attached to the end of the
winch cable is lowered inside the rod string and locks on to the
"backend", located on the top end of the lifter tube. The winch
is retracted, pulling the lifter tube to the surface. A
core-lifter-spring at the bottom of the tube prevents the core
from dropping out. The core samples are then washed,
measured, and catalogued for analysis by a geologist.
Drilling is done slowly and carefully to preserve the life of
expensive drill bits and rods.