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.
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. This is very important when exploring fault zones such as the San Andreas Fault.
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|
|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|
Craelius Core Barrel
Longyear Core Barrel
Boart Longyear Core Barrel
Secoroc Core Barrel
Atlas Copco 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
Terms & Conditions of Ordering:
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.
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.
Generally need 15-25 days
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 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
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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