API Standard Tci Tricone Three Cone Rock Roller Drill Bit For Oil Rig And Mining

IADC

WOB(kN/mm)

RPM (r/min)

Suitable formation

417

0.35~0.90

140~70

Very soft with low compressive strength and high drillability,such as shale,clay,sandstone and conglomerate,etc.

437

0.35~0.95

140~60

Very soft with low compressive strength and high drillability,such as shale,clay,sandstone and conglomerate,etc.

517

0.35~1.05

120~50

Soft with low compressive strength and high drillability,such as shale,clay,sandstone and soft limestone,etc.

537

0.35~1.05

110~40

Medium soft with low compressive strength and harder abrasive stringers,such as hard shale,hard gypsolyte,soft limestone,sandstone
and dolomite with stringers,etc.

617

0.35~1.05

80~40

Medium hard with high compressive strength and thick&hard stringers,such as hard shale,limestone, sandstone and dolomite,etc.

637

0.70~1.20

70~40

Medium hard with high compressive strength and high abrasiveness,such as limestone,dolomite, sandstone and chert.ect.

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