| WELCOME TO HANJIN DRILLING CO., LTD. |
| HANJIN DRILLING CO., LTD. specializes in the design, development and manufacture of Drill Rigs, Down Hole Hammer & Drilling Accessories for water well, Soil Investigation, Direction Drill & Civil Construction. |
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Dual rotary system allows us to drill through all types
of unconsolidated overburden such as sand, gravel and
boulders. The lower rotary drive can push casing up to
20 inches in diameter while, at the same time, an independent
rotary top drive handles a drillstring equipped with a
down-the-hole hammer, drag bit or rolling cone rock bit.
Our dual rotary rig can handle difficult formations without
the use of casing hammers, under-reamers or drilling mud.
Because the drives are independent, the bit drill can
drill inside, flush with, or ahead of the casing depending
on the type of overburden encountered.
In situations where heaving is a factor or sample accuracy
is important, the casing is advanced ahead of the drill
bit for hole stability and minimal cross-contamination
of cuttings.
In situations where boulders are encountered, the drill
operator can stop the casing rotation, and continue through
the boulder with a drill string. Once a pilot hole is
established in the boulder, the operator begins rotating
the casing again, and it follows the drill string through
the boulder.
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This "pilot hole" technique combines with the rotation
of the casing to deliver an uncommonly straight borehole.
Once the desired casing depth is achieved, the dual rotary
drill continues drilling like a conventional top-drive air
drill.
The skill and experience of our drill crews combined with
the quality of our equipment allows us to assure our customers
that we can drill a water well in any terrain or time of the
year and for an affordable cost as well. |
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Copyright(c)
2003 HANJIN DRILLING CO.,LTD All Rights Reserved |
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