8 1/2 inch IADC127 Milled Tooth Tricone Bit

BasicalParameter

Bit Size

8 1/2"(216MM)

IADC Code

127

Tooth Type

Steel /Milled Tooth

Bearing Type

Elastomer Sealed Bearing

Connection

6 5/8"API reg pin

Rotary Speed(rpm)

180~80

Weight on Bit(KN/MM)

Formation

low compressive strength,high drill-ability and soft formation,like shale,clay,salt rock and soft limestone,etc.

IADC

Rock formation

WOB (KN/mm)

WOB (KN/mm)

116/117

Low compressive strength, high drill-ability and extremely soft formation, like soft shale, clay, conglomerate etc.

180~80

126/127

Low compressive strength, high drill-ability and soft formation, like shale, clay, soft limestone, salt rock, etc.

180~80

136/137

Soft to medium soft with low compressive strength or soft with hard interlayer, like anhydrite, soft limestone,sandstone, etc.

130~60

216/217

Medium hard formation with relatively high compressive strength and hard interlayer, like hard shale, sandstone, limestone, etc.

100~50