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6 3/4″ MR412 Tricone Bit
IADC 412 · Φ171mm · 21kg · 3 1/2″ API
Cutting structure & formations
Gage rows: Chisel. Inner rows: Conical. For very soft formations with low compressive strength, high drillability, typically shale, soft limestone, sandstone, conglomerate, soft dolomite, coal ore.
ORIGINAL · EN Chisel on gage, conical on inner rows. Designed for very soft formations with low compressive strengths and high drillability such as shale, soft limestone, sandstone, conglomerate, soft dolomite 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 6 3/4″ / Φ171 mm, weight 21 kg
- Connection 3 1/2″ API, bearing Roller-Ball-Roller-Thrust Button/Open Bearing
- WOB 6,750–13,500 lbs, rotary speed 90–120 rpm
Technical parameters
| Model | MR412 |
|---|---|
| IADC code | 412 |
| Diameter | 6 3/4″ / Φ171mm |
| Thread | 3 1/2″ API |
| Weight | 21 kg |
| Bearing type | Roller-Ball-Roller-Thrust Button/Open Bearing |
| Circulation | Jet Air |
| Inner row teeth | Conical |
| Gage row teeth | Chisel |
| Gage bevel protection | Round |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 6,750–13,500 lbs |
|---|---|
| Rotary speed | 90–120 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 4,000–7,000 Psi |
