Surface set bit HQ for soft rock formation drilling


Roschen Surface set diamond 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. 

To avoid excessive matrix wear at the leading edge of each segment, tungsten carbide inserts are fitted on each side of the waterway. 

This kind of bits cannot be used in broken or loose formations. Rockcode surface set bits have proven to have a high penetration rate, long service life, and best adaptability to change formation.


Diamond sizes (SPC) 

Recommend:  
the softer formation, the larger the diamonds used i.e. 15 spc.
In medium hard formation, uses 20 to 30 spc. In hard formation, uses much smaller diamonds 40 to 60 spc. Diamond contest is mearsured in carat. Other diamond qualities and sizes on request.

Matrix 
Roschen surface set bits are manufactured using a hard matrix with high resistance to eroslon.

Diamond quality 
The standard range of natural diamonds for surface set bits is chosed in a special all-round grade with special quality. These stones have a high impact resistance and may be considered as an universal type.



Crown 

Surface set drill bits are available in different crowns to obtain optimal drilling performation.
Standard profiles for surface set core bits:

• Multi-steps
• Semi-round    
• Face discharge (FD) 
• Non-coring bits with concave profile