Product Details

Product Description

1,Roller bits bearing type :

Bit leg Bearing type

Applicable Formations

Rubber sealed bearing

hard information, such as hard shale, anhydrite, soft limestone, sandstone,

ham sandwich dolomite, etc

Metal sealed bearing

More harder information than then former ,and more higher temperature resistant.

2, According to IADC code for rock formations :

IADC	WOB (KN/mm)	RPM (r/min)	Applicable Formations
114/116/117	0.3~0.75	180~60	Very soft formations with low compressive strength and high drillability
124/126/127	0.3~0.85	180~60	Soft formations with low compressive strength and high drillability,
214/215/216/217	0.35~0.95	150~60	Medium formations with high compress strength
437	0.35~0.95	140~60	Soft stratum, such as shale, clay, sandstone, conglomerate, etc
517	0.35~1.05	120~50	soft, and have a hard abrasive sandwich, such as hard shale, anhydrite, soft limestone, sandstone, ham sandwich dolomite, etc
537	0.35~1.05	110~40	soft, and have a hard abrasive sandwich, such as hard shale, anhydrite, soft limestone, sandstone, ham sandwich dolomite, etc
617/637	0.35~1.05	110~40	hard and abrasive high formation, such as limestone, dolomite, sandstone, chert, etc