Overburden drilling bits
Product Description
Because of weakness of the drilling ground, in order to prevent it from collapsing,The drilling and casing insertion can be conducted in the same time, withdrawing the bits when leaving the casing.
|
Model |
No. of Wings |
Bit Diameter (mm) |
Casing Size (mm) |
Applicable |
|||
|
Expanded |
Retracted |
I.D. |
O.D. |
Wall |
|||
|
DWEX-6B |
2 |
190.5 |
141 |
155.2 |
168.2 |
6.5 |
DW40 |
|
DWEX-7B |
2 |
222.2 |
167 |
178.4 |
193.6 |
7.6 |
DW60 |
|
DWEX-8B |
3 |
254 |
189 |
203.8 |
219 |
7.6 |
DW80 |
|
DWEX-9B |
3 |
279.4 |
219 |
241.2 |
254 |
6.4 |
DW80 |
|
DWEX-10B |
3 |
311.1 |
235 |
254.6 |
273 |
9.2 |
DW80 |
|
DWEX-12B |
3 |
335 |
281.5 |
305.7 |
318.5 |
6.4 |
DW100 |
|
DWEX-14B |
3 |
373 |
320 |
336.6 |
355.6 |
9.5 |
DW112 |
|
DWEX-16B |
3 |
425 |
363 |
387.4 |
406.4 |
9.5 |
DW112 |
|
DWEX-18B |
3 |
478 |
410 |
435 |
457.2 |
11.1 |
DW112 |
|
DWEX-20B |
4 |
530 |
455 |
482.6 |
508 |
12.7 |
N180 |
|
DWEX-22B |
4 |
581 |
506 |
533.4 |
558.8 |
12.7 |
N180 |
|
DWEX-24B |
4 |
632 |
557 |
584.2 |
609.6 |
12.7 |
N180 |
|
DWEX-26B |
4 |
685 |
603 |
635 |
660.4 |
12.7 |
N240 |
|
DWEX-28B |
4 |
737 |
652 |
685.8 |
711.2 |
12.7 |
N240 |
|
DWEX-30B |
4 |
784 |
706 |
736.6 |
762 |
12.7 |
N240 |
|
DWEX-32B |
4 |
850 |
748 |
787.4 |
812.8 |
12.7 |
N240 |
|
DWEX-34B |
4 |
886 |
808 |
838.2 |
863.6 |
12.7 |
DW750 |
This standard can be changed according to customer requirements.