Nmlc, Hmlc Wireline Drilling Impregnated Diamond Core Drill
Bit/Coal Mine Drill Bit
Product Description:
With bottom discharge diamond core bits, which is suitable for
triple tube core barrels, to improve the flushing fluid's erosion
against the core during drilling.
The main crown technical parameters of impregnated diamond core
bits include diamond grade,size,concentration and quality,matrix
hardness and crown shapes.The users can make rational selections
according to the formations to be drilled.
To avoid excessive bit wear,tungsten carbide inserts are used on
both sides on the waterway,and gage stones are a bit larger.
Surface Set Diamond Core Bits can be used with any type of core
barrels. By varying the diamond grade, size, quality, and matrix
hardness and crown shapes, the users can satisfactorily drill and
core hard and homogeneous formations.
Size:
| No. | Std. | Item | OD*ID(mm) | Crown Height | SN. |
| 1 | NMLC | diamond bit | 75.3*52.0 | C6 C9 C12 | K3 K5 K7 K9 |
| 2 | HMLC | diamond bit | 98.8*63.5 | C6 C9 C12 | K3 K5 K7 K9 |
| 1 | AWG | diamond bit | 47.6*30.1 | C6 C9 | K3 K5 K7 K9 |
| 2 | BWG | diamond bit | 59.5*42.0 | C6 C9 | K3 K5 K7 K9 |
| 3 | NWG | diamond bit | 75.3*54.7 | C6 C9 | K3 K5 K7 K9 |
| 4 | NWM | diamond bit | 75.3*54.7 | C6 C9 | K3 K5 K7 K9 |
Attention:
1.The difference between the outer diameter of the bit and the
reamer should be reasonable, the outer diameter of the reamer
is 0.3-0.5mm larger than the outer diameter of the bit, and the
hard formation should not more than 0.3mm.
2.When the new bit reaches the bottom of the hole light pressure
(1/3 of the normal pressure),
slow turn (about 100rimin), and then continue drilling with normal
parameters after the initial grinding for 10 minutes.
3.When drilling in soft rock layer, the pressure should be reduced
appropriately. When drilling in intact, medium-hard orhard
rock formations, the pressure on bit should be appropriately
increased; When drilling in fractured, fractured and heterogeneous
rock formations, the pressure on bit should be appropriately
reduced, generally by 25%-50%.
How to choose the hardness of bit
