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9 7/8″ MR715 Tricone Bit
IADC 715 · Φ251mm · 65kg · 6 5/8″ API
Cutting structure & formations
Gage rows: Conical. Inner rows: Ogive. For hard formations with high compressive strength, typically granite, limestone, sandy sandstone, dolomite, chert.
ORIGINAL · EN Conical 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 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 39,500–59,250 lbs, rotary speed 60–90 rpm
Technical parameters
| Model | MR715 |
|---|---|
| IADC code | 715 |
| 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 | Conical |
| Gage bevel protection | Round |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 39,500–59,250 lbs |
|---|---|
| Rotary speed | 60–90 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 37,000–44,000 Psi |
