Home / Products / Tricone / Soft Formation 4xx / 9 7/8″ MR435
9 7/8″ MR435 Tricone Bit
IADC 435 · Φ251mm · 65kg · 6 5/8″ API
Cutting structure & formations
Gage rows: Conical. Inner rows: Conical. For hard formations with high compressive strength.
ORIGINAL · EN Chisel on gage, ogive 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 and wear resistant carbide on shirttail lip and lug.
ORIGINAL · EN Hardmetal and wear resistant carbide on shirttail lip and lug.
- Diameter 9 7/8″ / Φ251 mm, weight 65 kg
- Connection 6 5/8″ API, bearing Roller-Ball-Roller-Thrust Button/Sealed Bearing
- WOB 9,880–39,500 lbs, rotary speed 90–120 rpm
Technical parameters
| Model | MR435 |
|---|---|
| IADC code | 435 |
| Diameter | 9 7/8″ / Φ251mm |
| Thread | 6 5/8″ API |
| Weight | 65 kg |
| Bearing type | Roller-Ball-Roller-Thrust Button/Sealed Bearing |
| Circulation | Jet Air |
| Inner row teeth | Ogive |
| Gage row teeth | Chisel |
| Gage bevel protection | Round |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 9,880–39,500 lbs |
|---|---|
| Rotary speed | 90–120 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 6,000–9,000 Psi |
