- Adopting IDS equal wear design models;
- UsingC2,P1/P2,G2 crown types to optimize the internal cone bearing pressure and improve straight well anti-deviation capabilities;
- UsingT1,T2,T3 cutters to enhance nose overall performance and shoulder impact resistance;
- Applying HI hydraulic structure design to improve cuttings transport speed and prevent mud cake;
- Ensuring the balance force is within the green standard, combined with power drilling tools to enhance interlayer penetration capabilities.
| F o r m a t i o n | IADC | Lithology | Bits Selection |
| Very Soft | M121/S121 M122/S122 | Clay,Sandstone,Siltstone | M/S316*F、M/S416*F、M/S419*F M/S516*F、M/S519*F |
| Soft | M221/S221 M222/S222 | Sandstone,Shale,Marlstone | M/S416*F、M/S519*F、M/S516*F |
| Medium | M322/S322 M323/S323 | Limestone,Sandstone,Conglomerate | M/S516*F、M/S519*F、M/S619*F |
| Medium to Hard | M323/S323 M333/S333 | Sandstone,Dolomite,Limestone | M/S516*H、M/S616*H M/S513*H、M/S613*H |
| Hard | M423/S423 M433/S433 | Tuff,Granite,Siltstone,Dolomite | M/S716*H、M/S613*H M/S713*H、M/S813*H |