Diameter 400mm TCI IADC code 637 Tricone Bits

IADC

code

Normal WOB

kN/mm (bit dia.)

Rotary

speed (rpm)

Very soft with low

compressive strength

and high drillability,

such as soft shale ,

clay and salt bed,etc

Hardfaced gage and all tooth surfaces,

the gage fitted with compacts

for enhanced gage protection ,

and a row of trimmers is added

between gage row and heel row

127

/137

Soft with low compressive

strength and high drillability,

such as sale ,clay,salt bed

and soft limestone,etc

Hardfaced gage and all tooth surfaces,

the gage fitted with compacts for

enhanced gage protection ,and a

row of trimmers is added between

gage row and heel row

427

/ 437

Very soft formations with

low compressive strength

and high drillability,such as

clay,mudstone,chalk,

gypsum,salt,soft

limestone, etc.

Large dia. Offset crested.scoop compacts

in inner row,wedge compacts in outer row ,

high compact exposure, inequable spaced

compacts arrangement,and a row of

trimmers is added between gage row

and heel row

447

/ 517

/ 527

Soft formations with low

compressive strength

and high drillability,such as

mudstone,gypsum,

salt,soft limestone, etc.

Large dia. Offset crested.scoop compacts

in inner row,wedge compacts in outer row ,

high compact exposure, inequable spaced

compacts arrangement,and a row of

trimmers is added between gage row

and heel row

537

/547

Medium soft with low

compressive strength and

harder abrasive stringers,

such as hard shale,

mudstone ,soft limestone

and sandstone,etc

Large radius scoop compacts in inner row,

wedge compacts in outer row, inequable

spaced compacts arrangement ,

and a row of trimmers is added

between gage row and heel row

617

/627

/637

Medium hard with

compressive strength and

thick and hard stringers ,

such as limestone ,hard

shale,mudstone and

sandstone,etc.

Conical compacts in inner row,spherical

compacts in outer row,and a row of

trimmers is added between gage row

and heel row

Hard formation with high

abrasiveness ,such as

hard limestone, dolomite,

hard sandstone and

chert,etc

Large radius conical compacts in inner row ,

spherical compacts in outer row ,

and a row of trimmers is added between

gage row and heel row.

200~40