Impregnated diamond core bit manufacturer
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Rotary speed selection chart


 


Bit type

Impregnated core bits

Increase the speed

Surface set core bits

Decrease the speed

Bit diameter

Small bit diameter

Increase the speed

Large bit diameter

Decrease the speed

Peripheral velocity

High velocity

Decrease the speed

Low velocity

Decrease the speed

Rock properties

Hard and complete

Increase the speed

Soft and broken

Decrease the speed

Diamond
Large size

Increase the speed

Small size

Decrease the speed

Drilling equipment and core barrel

Good stability

Increase the speed

Poor stability

Decrease the speed

Drilling depth
Shallow hole

Increase the speed

Deep hole

Decrease the speed

Structure of boreholes

Simple structure

Increase the speed

Complicated structure

Decrease the speed


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