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7 7/8″ MR545 Tricone Bit
IADC 545 · Φ200mm · 34kg · 4 1/2″ API
Cutting structure & formations
Gage rows: Conical. Inner rows: Conical. For medium-soft formations with low compressive strength, typically shale, soft limestone, dolomite with interlayers, coal ore.
ORIGINAL · EN Conical 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 on lug; Wear resistant carbide on shirttail lip and lug.
ORIGINAL · EN Hardmetal on lug; Wear resistant carbide on shirttail lip and lug.
- Diameter 7 7/8″ / Φ200 mm, weight 34 kg
- Connection 4 1/2″ API, bearing Roller-Ball-Roller-Thrust Button/Sealed Bearing
- WOB 15,750–39,380 lbs, rotary speed 80–110 rpm
Technical parameters
| Model | MR545 |
|---|---|
| IADC code | 545 |
| Diameter | 7 7/8″ / Φ200mm |
| Thread | 4 1/2″ API |
| Weight | 34 kg |
| Bearing type | Roller-Ball-Roller-Thrust Button/Sealed Bearing |
| Circulation | Jet Air |
| Inner row teeth | Conical |
| Gage row teeth | Conical |
| Gage bevel protection | Round |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 15,750–39,380 lbs |
|---|---|
| Rotary speed | 80–110 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 18,000–27,000 Psi |
