Bit Type | IADC | Recommend parameter | Apply formation |
Pulldown (kN/mm) | Rotation speed (r/min) |
Rubber sealed | 117 | 0.35~0.90 150~80 | Extremely soft formations with low compressive strength and high drillability, such as soft shale, clay, salt rock, etc. |
127 | 0.35~1.00 150~70 | Low compressive strength, high drillability soft formation, such as shale clay, salt rock, soft limestone,etc |
417 | 0.35~0.90 140~70 | Extremely soft formations with low compressive strength and high drillablity, such as shale, clay, sandstone, conglomerate, etc |
437 | 0.35~0.95 140~60 | Extremely soft formations with low compressive strength and high drillability, such as shale, clay, sandstone, conglomerate, etc |
447 | 0.35~1.00 140~60 | Soft formations with low compressive strength and high drillability, such as shale, clay, salt rock, sandstone, soft limestone, gypsum, etc. |
517 | 0.35~1.05 120~50 | Soft formations with low compressive strength and high drillability, such as shale, clay, sandstone, soft limestone, etc. |
527 | 0.35~1.05 120~50 | Soft formations of compressive strength, such as shale, clay, sandstone, soft limestone, salt rock, anhydrite, etc. |
537 547 | 0.35~1.05 110~40 | Compressive strength, medium soft, with hard abrasive interlayer, such as hard shale, anhydrite, soft limestone, sandstone, etc |
617 627 | 0.35~1.05 80~40 | High compressive strength, medium to hard, with thick hard intercalations such as hard shale, limestone, dolomite, sandstone, etc |
637 | 0.70~1.20 70~40 | High compressive strength, high abrasive and medium hard formations such as limestone, dolomite, sandstone,flint,etc |
8 3/4'' 617 
