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8 1/2″ MR735 Tricone Bit
IADC 735 · Φ216mm · 38kg · 4 1/2″ API
Cutting structure & formations
Gage rows: Ovoid. Inner rows: Ogive. For hard formations with high compressive strength, typically granite, limestone, sandy sandstone, dolomite, chert.
ORIGINAL · EN Ovoid on gage, ogive on inner rows. Designed for hard and abrasive formations with high compressive strengths such as granite, limestone, sandy 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 8 1/2″ / Φ216 mm, weight 38 kg
- Connection 4 1/2″ API, bearing Roller-Ball-Roller-Thrust Button/Sealed Bearing
- WOB 34,000–59,500 lbs, rotary speed 60–90 rpm
Technical parameters
| Model | MR735 |
|---|---|
| IADC code | 735 |
| Diameter | 8 1/2″ / Φ216mm |
| Thread | 4 1/2″ API |
| Weight | 38 kg |
| Bearing type | Roller-Ball-Roller-Thrust Button/Sealed Bearing |
| Circulation | Jet Air |
| Inner row teeth | Ogive |
| Gage row teeth | Ovoid |
| Gage bevel protection | Round |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 34,000–59,500 lbs |
|---|---|
| Rotary speed | 60–90 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 43,000–52,000 Psi |
