Technical Data
1. Bearing type: Rubber sealedjournal bearing
2. Quantity of nozzles: 3-4pcs
3. Pin size: API 7 5/8REG
4. Bit weight net:230kg
5. Bit weight gross:250kg
6. Rotation speed: 150-60r/min
7. WOB: 0.4-0.7kN/mm
No | IADC Code | Recommendation | ||
WOB(KN/mm) | Rotary Speed(rpm) | |||
1 | 117 | 0.35~0.8 | 240~80 | |
2 | 127 | 0.35~0.9 | 240~70 | |
3 | 437 447 | 0.35~0.9 | 240~70 | |
4 | 517 527 | 0.35~1.0 | 220~60 | |
5 | 537 547 | 0.45~1.0 | 220~50 | |
6 | 617 627 | 0.45~1.1 | 200~50 | |
7 | 637 | 0.5~1.1 | 180~40 | |
Application
Bit is designed for drilling ofoil and gas wells in very soft formations such as clay, shale, chalk, gypsum,rock salt, soft shale, and soft limestone.
Features
1. Combined circulation(Threeside jets and one central jet).
2. Shirttail and leg enteringedge hardfacing.
3. Shirttail protection withTCI.
4. Enhanced teeth hardfacing.
5. Inserts on gagesurface.
6. Additional gage row.
