Add to Cart
Double tube core barrel NQ 3.0 meters for Mining Exploration Core Drilling
Coring In-Hole Tools
CORE BARRELS, BITS, RODS, CASING AND TOOLS
Roschen offers a variety of high quality coring drilling systems
which include core barrels, core diamond drill bits, drill rods,
casings and more.
Exploration diamond drilling is used in the mining industry to probe the contents of known ore deposits and potential sites. By withdrawing a small diameter core of rock from the orebody, geologists can analyse the core by chemical assay and conduct petrologic, structural and mineralogical studies of the rock.
Rodolphe Leschot is often cited as being the inventor of the first
core bit in 1863. Early diamond drilling opened up many new areas
for mineral mining, and was related to a boom in mineral
exploration in remote locations. Before the invention of the
portable diamond drill, most mineral prospecting was limited to
finding outcrops at the surface and hand digging. In the late
1970s, General Electric pioneered the technology of polycrystalline
diamond compacts (PDCs) as a replacement for natural diamonds in
drill bits.
Exploration diamond drilling differs from other geological drilling
(see Drilling rig) in that a solid core is extracted from depth,
for examination on the surface. The key technology of the diamond
drill is the actual diamond bit itself. It is composed of
industrial diamonds set into a soft metallic matrix. As shown in
the figure, the diamonds are scattered throughout the matrix, and
the action relies on the matrix to slowly wear during the drilling,
so as to expose more diamonds. The bit is mounted onto a drill
stem, which is connected to a rotary drill. Water is injected into
the drill pipe, so as to wash out the rock cuttings produced by the
bit and also to reduce the heat produced due to friction which
causes less wear and tear of the bits. An actual diamond bit is a
complex affair, usually designed for a specific rock type, with
many channels for washing.
The drill uses a diamond encrusted drill bit (pictured on the right) to drill through the rock. The drill produces a "core" which is photographed and split longitudinally. Half of the split core is assayed while the other half is permanently stored for future use and re-assaying if necessary. Although a larger diameter core is the most preferred it is the most expensive. The most common diameter sizes of core are NQ and CHD 76.
Early exploration companies tended to choose drilling contractors
who typically charge per meter rates and/or day rate depending on
difficulty of project. For example, Energold Drilling would provide
diamond drilling services for projects with limited infrastructure
and focus on portability, whereas larger drilling groups such as
Boart Longyear tended to work on established producing mine sites.
Core extraction
Merely advancing the drill by rotary action (and washing) causes a
core to be extracted inside the barrel as shown. However, at a
depth of perhaps 300 m, there must be a way to retrieve the core
and take it to the surface. Constantly withdrawing the entire heavy
drill pipe is impractical, so methods were developed to pull up the
core inside the barrel. If the rock would always be solid granite,
and the core would always break at the drill bit, then it would be
a simple matter to stop the drilling, and lower a simple grabbing
device by a wire and pull up the core. Unfortunately, many
applications require an undisturbed core in fractured rock, which
calls for elaborate wire-line devices.
The photo shows the extraction of a core, using a triple-tube
wire-line system, capable of extracting core under the worst
conditions.[4] This is very important when exploring fault zones
such as the San Andreas Fault.
Tube sizes
There are five major "wire line" tube sizes typically used. Larger
tubes produced larger diameter rock cores and require more drill
power to drive them. The choice of tube size is a trade-off between
the rock core diameter desired and the depth that can be drilled
with a particular drilling rig motor.
Standard "Q" wire line bit sizes
Standard "Q" wire line bit sizes | ||
Size | Hole (outside) diameter, mm | Core (inside) diameter, mm |
AQ | 48 | 27 |
BQ | 60 | 36.5 |
NQ | 75.7 | 47.6 |
HQ | 96 | 63.5 |
PQ | 122.6 | 85 |
CHD 76 | 75.7 | 43.5 |
CHD 101 | 101.3 | 63.5 |
CHD 134 | 134 | 85 |
Q Series Wireline Core Barrel System Sizes | ||
SIZE | CORE Ø | HOLE Ø |
AQTK | 35.5 mm (1-3/8 in) | 48 mm (1-7/8 in) |
BQ | 36.4 mm (1-7/16 in) | 60 mm (2-3/8 in) |
BQTK | 40.7 mm (1-5/8 in) | 60 mm (2-3/8 in) |
NQ | 47.6 mm (1-7/8 in) | 75.7 mm (3 in) |
NQTK (NQ2") | 50.6 mm (2 in) | 75.7 mm (3 in) |
NQ3 | 45 mm (1-3/8 in) | 75.7 mm (3 in) |
HQ | 63.5 mm (2-1/2 in) | 96 mm (3-3/8 in) |
HQ3 | 61.1 mm (2-3/8 in) | 96 mm (3-3/8 in) |
PQ | 85 mm (3-3/8 in) | 122.6 mm (4-7/8 in) |
PQ3 | 83 mm (3-1/4 in) | 122.6 mm (4-7/8 in) |
Core Barrel System Sizes | ||||
SYSTEM | CORE Ø | HOLE Ø | ||
mm | in | mm | in | |
A | 48,0 | 1.89 | 27,0 | 1.06 |
B | 59,9 | 2.36 | 36,4 | 1.43 |
N | 75,7 | 2.98 | 47,6 | 1.88 |
H | 96,1 | 3.78 | 63,5 | 2.5 |
P | 122,6 | 4.83 | 85,0 | 3.35 |
Keywords:
Core Barrels
Craelius Core Barrel
Longyear Core Barrel
Boart Longyear Core Barrel
Secoroc Core Barrel
Atlas Copco Core Barrel
Core barrel
Wireline Core Barrel
AQTK Core Barrel
BQ Core Barrel
NQ Core Barrel
HQ Core Barrel
PQ Core Barrel
NMLC Core Barrel
HMLC Core Barrel
BWG Core Barrel
NWG Core Barrel
HWG Core Barrel
AQWL Core Barrel
BQWL Core Barrel
NQWL Core Barrel
HQWL Core Barrel
PQWL Core Barrel
SQWL Core Barrel
Double Tube Core Barrel
Metric Core Barrel
T2-66 Core Barrel
T2-76 Core Barrel
T2-86 Core Barrel
T2-101 Core Barrel
T6-76 Core Barrel
T6-86 Core Barrel
T6-101 Core Barrel
T6-116 Core Barrel
T6-146 Core Barrel
WT SERIES CORE BARRELS:
BWT SERIES CORE BARRELS
NWT SERIES CORE BARRELS
HWT SERIES CORE BARRELS
PWT SERIES CORE BARRELS
WM SERIES CORE BARRELS:
AXM/AWM SERIES CORE BARRELS
AXM SERIES CORE BARRELS
AWM SERIES CORE BARRELS
BWM SERIES CORE BARRELS
NWM SERIES CORE BARRELS
HWM SERIES CORE BARRELS
WG SERIES CORE BARRELS:
BWG SERIES CORE BARRELS
NWG SERIES CORE BARRELS
HWG SERIES CORE BARRELS
WF SERIES CORE BARRELS:
NWF SERIES CORE BARRELS
HWF SERIES CORE BARRELS
BWL Core Barrel
NWL Core Barrel
HWL Core Barrel
PWL Core Barrel
FAQ
Terms & Conditions of Ordering:
Quality warranty:
Our products are made of high quality steel and all spares parts
are inspected strictly before shipping. We have quickly responses
for your complaint and suggestion.
Package:
Using ply-wooden cases and pallet for package to protect the
products and avoid the damage during transportation. Also we can
customize package according to your special requests.
Production time:
Generally need 15-25 days
Transportation:
By air, By Express or By sea according to your requests.
1. Methods of Payment:
T/T (Telegraphic Transfer) or Western Union or L/C at sight
2. Handling time for an order
Based on order quantity, normally it takes 20 days for production.
in 3 working days after receiving the advance payment
3. Shipping way
Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or
by air
Bulk order: we suggest by air or by sea.
4. Quality Control
We have our own experienced QC.
There will be strict inspection and testing for every order before
shipping out.
5. After Services:
a. Our sales team will response for your question within 24 hours
(Holidays Excluded)
b. Technical Support will be available in any time
6. Quality & Service:
A. There will be strict inspection and testing for every order
before shipping out.
B. Our sales team and Technical Support will response for your
question within 24 hours through skype: ROSCHEN.TOOL and
WhatsApp/Wechat: +86-13764195009
C. Free replacement will provide once the failure confirmed caused
or our product quality; Not satisfied with a refund.
For more information, please contact:
ROSCHEN INC.
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED
Skype: ROSCHEN.TOOL , ROSCHEN_GROUP
WeChat: +86-137 6419 5009 ; +86-135 8585 5390
WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390
Email: roschen@roschen.com ; roschen@roschen.net
Website: http://www.roschen.com ; http://www.roschen.net
http://www.roschen.cn ; http://www.roschendrill.com
http://www.roschenmining.com ; http://www.roschendrilling.com