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| IADC | Applicable Formatitons | Recommended Parameters | |
| WOB KN/mm | RPM(r/min) | ||
| 417/427/437 | Low compressive strength,high il-abilityt and extremely soft formation,like shale,clay.sandstone,conglomerate etc. | 0.35-0.90 | 140-70 |
| 447 | Low compressive strength,high drill ability and soft formation, like shale, clay, sandstone, soft limestone, salt rock,plaster etc. | 0.37-1.00 | 140-60 |
| 517 | Low compressive strength,high dril ability and soft formation,like shale, clay, sandstone, soft limestone,salt rock,etc. | 0.37-1.05 | 120-50 |
| 527 | Soft formation with low compressive, like Low compressive strength, high dilabilityt and soft formation,like shale,clay sandstone, soft limestone, salt rock,anhydrite etc. | 0.35-1.05 | 120-50 |
| 537/547 | Low compressive strength,medium hard formation with hard abrasive interlayer, like Hard shale, anhydrite, soft limestone, sandstone, dolomite with mezzanine, etc. | 0.50-1.05 | 110-40 |
| 617/627 | High compressive strength, medium hard and thick hard interlayer, like hard shale, limestone, sandstone, dolomite,etc. | 0.50-1.05 | 80-40 |
| 637/737 | High compressive strength, medium hard and high abrasive formation, like limestone, dolomite, sandstone, chert, etc. | 0.70-1.20 | 70-40 |
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