7 7/8" steel tooth tricone drill bit for water well

Bit   Size

7 7/8"(200MM)

IADC   Code

127

Tooth   Type

Steel   /Milled Tooth

Bearing   Type

Elastomer   Sealed Bearing

Connection

4 1/2"API   reg pin

Rotary   Speed(rpm)

180~80

Weight   on Bit(KN/MM)

0.35~1.00

Formation

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

116/117

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

0.35~0.90

180~80

126/127

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

0.35~1.00

180~80

136/137

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

0.37~1.05

130~60

216/217

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

0.5~1.20

100~50