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| IADC | WOB(kN/mm) | RPM (r/min) | Suitable formation |
| 417 | 0.35~0.90 | 140~70 | Very soft with low compressive strength and high drillability,such as shale,clay,sandstone and conglomerate,etc. |
| 437 | 0.35~0.95 | 140~60 | Very soft with low compressive strength and high drillability,such as shale,clay,sandstone and conglomerate,etc. |
| 517 | 0.35~1.05 | 120~50 | Soft with low compressive strength and high drillability,such as shale,clay,sandstone and soft limestone,etc. |
| 537 | 0.35~1.05 | 110~40 | Medium soft with low compressive strength and harder abrasive stringers,such as hard shale,hard gypsolyte,soft limestone,sandstone |
| and dolomite with stringers,etc. | |||
| 617 | 0.35~1.05 | 80~40 | Medium hard with high compressive strength and thick&hard stringers,such as hard shale,limestone, sandstone and dolomite,etc. |
| 637 | 0.70~1.20 | 70~40 | Medium hard with high compressive strength and high abrasiveness,such as limestone,dolomite, sandstone and chert.ect. |
| Note:The upper limits of WOB and RPM in above table should not be used simultaneously. | |||
| BIT SPECIFICATIONS | ||
| Tooth Type : | Milled Tooth | |
| Bearing Type: | Friction Bearing | |
| Seal Type: | O-Ring seals | |
| Bit Connection: | 4 -1/2 API REG | |
| OPERATION PARAMETERS | ||
| Rotation Speed | 80-170 RPM | |
| Weight on Bit : | 16-45 KLBS | 76-194 KN/mm |
| Make Up Torque | 12.0-16.0 Klb.ft | 16-22 KN.m |

