20'' 508mm Tricone Roller Bit for Drilling Hard Rock Drill Bit Tool in India

417/437/

447/415/435

0.35~0.9

150~70

Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, gypsum, salt, soft limestone, etc.

517/527/515

0.35~1.0

140~60

Soft formations with low compressive strength and high drillability, such as mudstone, gypsum, salt, soft limestone, etc.

537/547/535

0.45~1.0

120~50

Soft to medium formations with low compressive strength, such as medium, soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds, etc.

617/615

0.45~1.1

90~50

Medium hard formation with high compress strength, such as hard shale, limestone, sandstone, dolomite. etc

637/635

 0.5~1.2

80~40

Hard formations with high compressive strength, such as sandstone, limestone, dolomite ,hard gypsum, marble, etc.

Note: The upper limits of WOB and RPM in above table should not be used simultaneously.