Drilling drag bit
PDC Drag Bits also named blade bits, with a Tungsten Carbide
inserts on the blades.They are usually designed for use in soft formations such as sand,
clay, or some soft rock.Their uses include drilling water wells, mining, geothermal,
environmental and exploration drilling.Whenever possible, they should be used to drill pilot holes, for
they produce cuttings are easiest to log.Normally drag bits are 3 wings, but we can make 4 or 5 wings
following your drawings or samples. Many special designs are available upon your request.
Other than PDC bits, drilling drag bits have the lowest cost per
bit. Drilling drag bits are a rotary drill bit built with a steel
body and tungsten carbide teeth.
These bits will out preform other more expensive bits if used
appropriately. Drilling drag bits are extremely popular choice for
seismic drilling, blast hole drilling and geothermal drilling
applications. For best results adjust the rotational speed to 50%
less than what you would normally use for a tricone bit of the same
size and reduce the weight on bit by the same amount.
Description of drilling drag bit :
A drilling drag bit is simply a series of blades (usually three or
four in number) which produce a shearing action when rotated. They
are comparatively inexpensive due to the lack of moving
parts and they can penetrate softer formations such as stiff clays
and mudstones very quickly.
The drag bit usually used in very soft to medium formation when the
dth hammer as the tricone bit, lose of their effectiveness.
The cleaning of the hole is realized by the injection of air or
There are two forms of drag bits:
- "Step" type for soft grounds
- "Chevron" type for medium hard grounds
Specification of drilling drag bit:
1) Drag bits are made according to API standard or no thread
standard just welding.
2) Various step and chevron drag bits are available from 3 inch to
17 1/2 inch. (normal small size are 3”,3 3/4”,3 7/8”,4 3/4”,4
5/8”,5 7/8”,8 1/2" to 17 1/2"and so on).
3) There is very good feedback from our customers because of the
quality and price.
4) Different drag bits can be made according to your drawings or
|Item||Drilling drag bit|
|Type||Chevron and Step type|
|Wings||2, 3 and 4 wings|
|Size: from 3||5/8”(92mm) to 12|
2 3/8, 3 1/2, 4 1/2, 5 1/2, 6 5/8 API Reg. Pin