May 26, 2022
| IADC | Pressure(KN/mm) | Drill speed(r/min) | Applicable strata |
| 417/427 | 0.3-0.9 | 150-70 | Very soft strata have low compressive strength and high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc. |
| 437/447 | 0.35-0.9 | 150-70 | |
| 515/525 | 0.35-0.9 | 180-60 | Soft strata have low compressive strengthand high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc. |
| 517/527 | 0.35-1.0 | 140-50 | |
| 535/545 | 0.35-1.0 | 150-60 | Soft to medium-soft has low compressive strength, such as medium-soft shale, medium-soft limestone, medium-soft sandstone, forming medium-hard and hard grinding interlayer. |
| 537/547 | 0.4-1.0 | 120-40 | |
| 617/627 | 0.45-1.1 | 90-50 | High compressive medium-hard formation strength, such as hard shale, limestone, sandstone, dolomite, etc. |
| 637 | 0.5-1.2 | 80-40 | Hard strata have high compressive strength, such as sandstone, limestone, dolomite, gypsum, marble, etc. |
| 737 | 0.7-1.2 | 70-40 | Hard strata have high compressive strength, such as hard limestone, dolomite, etc. |
| 827/837 | 0.7-1.2 | 70-40 | Extremely hard strata with high compressive strength and abrasiveness, such as hard limestone, dolomite, hard sandstone, chert, etc. |
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