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9″ MR545 Tricone Bit
IADC 545 · Φ229mm · 50kg · 4 1/2″ API
Cutting structure & formations
Gage rows: Off-set chisel. Inner rows: Conical. For medium-soft formations with low compressive strength, typically shale, soft limestone, dolomite with interlayers, coal ore.
ORIGINAL · EN Off-set chisel on gage, conical on inner rows. Designed for medium-soft formations with low compressive strengths such as shale, soft limestone, dolomite with interlayers and coal ore.
Shirttail protection
Hardmetal and wear resistant carbide on shirttail lip and lug.
ORIGINAL · EN Hardmetal and wear resistant carbide on shirttail lip and lug.
- Diameter 9″ / Φ229 mm, weight 50 kg
- Connection 4 1/2″ API, bearing Roller-Ball-Roller-Thrust Button/Sealed Bearing
- WOB 18,000–45,000 lbs, rotary speed 80–110 rpm
Technical parameters
| Model | MR545 |
|---|---|
| IADC code | 545 |
| Diameter | 9″ / Φ229mm |
| Thread | 4 1/2″ API |
| Weight | 50 kg |
| Bearing type | Roller-Ball-Roller-Thrust Button/Sealed Bearing |
| Circulation | Jet Air |
| Inner row teeth | Conical |
| Gage row teeth | Off-set chisel |
| Gage bevel protection | Round |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 18,000–45,000 lbs |
|---|---|
| Rotary speed | 80–110 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 18,000–27,000 Psi |
