| IADC | Recommendation | Applicable Formation |
| WOB | RPM |
| 114 115 | 0.3~0.75 | 180~60 | Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, etc. |
| 124 125 | 0.3~0.85 | 180~60 | Soft formations with low compressive strength and high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc. |
| 134 135 | 0.3~0.95 | 150~60 | Soft to medium soft formations with low compressive strength and high drillability, such as medium soft shale, hard gypsum, medium soft limestone, medium soft sandstone, soft formation with harder interbed, etc. |
| 214 215 | 0.35~0.95 | 150~60 | Medium formations with high compressive strength, such as medium soft shale, hard gypsum, medium soft limestone, medium soft sandstone, soft formation with harder interbed, etc. |
| 244 | 0.35~0.95 | 150~50 | Medium hard formations with high compressive strength, such as abrasive shale, limestone, sandstone, dolomite, hard gypsum, marble, etc. |
| 324 | 0.4~1.0 | 120~50 | Medium abrasive formations, such as abrasive shale, limestone, sandstone, dolomite, hard gypsum, marble, etc. |
| 515 525 | 0.35~0.9 | 180~60 | Soft formations with low compressive strength and high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc. |
| 535 545 | 0.35~1.0 | 150~60 | Soft to medium formations with low compressive strength, such as medium soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasiver interbed, etc. |
| 635 645 | 0.5~1.2 | 100~40 | Hard formations with high compressive strength, such as sandstone, limestone, dolomite, anhydrite and marble, etc. |
