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12 1/4″ MR635 Tricone Bit
IADC 635 · Φ311mm · 98kg · 6 5/8″ API
Cutting structure & formations
Gage rows: Conical. Inner rows: Ogive. For medium-hard formations with high compressive strength, typically limestone, sandstone, dolomite, chert.
ORIGINAL · EN Conical on gage, ogive on inner rows. Designed for medium-hard and abrasive formations with high compressive strengths such as limestone, sandstone, dolomite and chert.
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 12 1/4″ / Φ311 mm, weight 98 kg
- Connection 6 5/8″ API, bearing Roller-Ball-Roller-Thrust Button/Sealed Bearing
- WOB 36,750–73,500 lbs, rotary speed 60–100 rpm
Technical parameters
| Model | MR635 |
|---|---|
| IADC code | 635 |
| Diameter | 12 1/4″ / Φ311mm |
| Thread | 6 5/8″ API |
| Weight | 98 kg |
| Bearing type | Roller-Ball-Roller-Thrust Button/Sealed Bearing |
| Circulation | Jet Air |
| Inner row teeth | Ogive |
| Gage row teeth | Conical |
| Gage bevel protection | Round |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 36,750–73,500 lbs |
|---|---|
| Rotary speed | 60–100 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 29,000–38,000 Psi |
