| IADC code |
Applicable Formation |
Main characteristics of the bit |
Recommended parameters |
| Cutting structure |
Normal WOB kN/mm (bit dia.) |
Rotary speed (rpm) |
| 117 |
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 |
0.30~0.9. |
300~80 |
| 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 |
0.30~0.9. |
300~80 |
| 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 |
0.35~0.90 |
280~70 |
| 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 |
0.35~1.05 |
240~50 |
| 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 |
0.50~1.05 |
220~40 |
| 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 |
0.50~1.10 |
220~40 |
| 737 |
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. |
0.50~1.20 |
200~40
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