Mineral Exploration Geological Wireline Coring Impregnated Diamond
Bit For Hard Rock Formations
Impregnated Diamond Type for Hard Rock Formations
Impregnated core bits are manufactured by bonding diamonds into a
matrix which wears away during drilling to continually expose the
diamonds for the cutting of rock. This process has distinct
advantages over surface set bits, which can shed diamonds from the
matrix leading to premature bit failure, due to the bit drilling
out the diamonds.
The disadvantage of impregnated bits is that if the wrong matrix is
selected or the bit is allowed to ‘run on bottom’ without
penetrating the matrix can ‘polish’ preventing further diamonds
from being exposed. The bit then has to be ‘mechanically’ stripped
to expose further diamonds. Therefore matrix selection for
impregnated bits is an important factor and often is a matter of
initial trial and error.
Generally the harder the rock, the softer the matrix. Most
manufacturers have adopted a numerical identification system for
their bits:- I =The hardest matrix up to 18 = The softest matrix.
Surface Set Diamond Type for Medium-Hard Conditions
Surface set bits are manufactured for high speed penetration, long
service life and suitability for a variety of rock conditions. The
range includes a variety of face profiles, diamond grades and stone
sizes, enabling our customers to choose a bit that will provide
optimum performance in any formation.
Diamond stone size: Stones Per Carat (spc)
10/15 spc: Soft to Medium Formation
20/25 spc: Medium to Hard Formation
30/40 spc: Medium Hard to Hard Formation
40/60 spc: Hard Formation
60/80 spc: Hard to Very Hard Formation
Polycrystalline Diamond Type for Soft-Medium Conditions (TSP & PCD)
The PCD bits have the same profile as sawtooth design bits, but the
cutters are composed of Polycrystalline Diamond (PCD) which give a
long working life, fast penetration and a high percentage core
recovery in soft and hard formations, from clay to hard limestones.
These bits are suitable for use with air, water, mud or foam flush.
Several types of PCD cutters are available depending on the
formation to be cored such as flat, clam or claw
Tungsten carbide type for very soft conditions
Tungsten carbide core bits are available to suit most sizes of core
barrel, and come in a variety of types to suit different drilling
conditions. Sawtooth design of bits can have various types of
inserts:
Size Available:
Q series:AQ,BQ,NQ,HQ,PQ,BQ3,NQ3/NQTT,NQ2,HQ3/HQTT,PQ3/PQTT
T2 Series: T2 46,T2 56,T2 66,T2 76,T2 86,T2 101
T6 Series: T6 76,T6 86,T6 101,T6 116,T6 131,T6 146, T6S 101
T Series: T36,T46,T56,T66,T76,T86
Z Series: Z46,Z56,Z66,Z76,Z86,Z101,Z116,Z131,Z146
B Series: B36,B46,B56,B66,B76,B86,B101,B116,B131,B146
WF Series: HWF,PWF,SWF,UWF,ZWF
WT Series: RWT,EWT,AWT,BWT,NWT,HWT
WM Series: EWM,AWM,BWM,NWM
WG Series: EWG,AWG,BWG,NWG,HWG
Others: NMLC,HMLC,LTK48,LTK60,BGM,NGM,ADBG,TBW,TNW,
ATW,BTW,NTW,NXD3,AX,NX,NXC,AXT,T6H,4 9/16,NWD4,412F,SK6L146,
TT46,TB56,TS116,CHD10
| Core Barrel & Overshot Size Available |
| Wireline Series | BQ, NQ, NQ-2, NQ-3, HQ, HQ-3, PQ, PQ-3 ( Surface & Underground); |
| Thin -wall | BTW, NTW, HTW |
| Conventional | LTK48, LTK60, T2 76, T2 86, T2 101 |
| Chinese Standard | SC56, S59, S75, S95; SCA56, SA59, SA75, SA95; S75ZD, SA75ZD, SA95ZD; P56, P59, P75, P91, PA-110, PA-130, P150 |
| Customer's special requirement is also available. |
| Series | Model | Drill BIt(mm) | Reamer | Outer Tube | Inner Tube | Unit Weight |
| Inner Diameter | Outer diameter | Outer Diamond | Outer Diameter | Inner Diameter | Outer Diameter | Inner Diameter | KG/Set |
| Q Series Core Barrel | BQ | 36.5 | 59.5 | 60 | 57.2 | 46 | 42.9 | 38.1 | 45 |
| NQ | 47.6 | 75.3 | 75.9 | 73 | 60.3 | 55.6 | 50 | 65 |
| HQ | 63.5 | 95.6 | 96 | 92.1 | 77.8 | 73 | 66.7 | 103 |
| PQ | 85 | 122 | 122.6 | 118 | 103 | 95.3 | 88.9 | 142 |
